Note: Descriptions are shown in the official language in which they were submitted.
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PLANT GROWTH REGULATION
The present invention relates to a method for improving the plant growth
regulation of crop
plants, by applying to the crop plants a mixture of a trinexapac-ethyl and
prohexadione-
calcium, and to a composition comprising the same.
Plant growth regulators are often used to regulate the growth and development
of crop plants.
For example, plant growth regulators are used to slow the development of a
crop (such as oil
seed rape) so that it flowers at a desired time, reduce the height of a crop
(such as in cereals)
so that it is less susceptible to lodging, increase nitrogen efficiency,
regulate flowering and
fruit set of a crop (such as fruit trees), and slow turfgrass growth rate to
reduce mowing
frequency.
There are several different classes of plant growth regulator. Known classes
include azoles
(such as uniconazole, and paclobutrazol), cyclohexane carboxylates (such as
trinexapac-ethyl,
and prohexadione-calcium), pyrimidinyl carbinols (such as flurprimidol, and
ancymidol),
quarternary ammoniums (such as chlormequat-chloride, and mepiquat-chloride),
and
sulphonyl-amino phenyl-acetamides (such as mefluidide).
Plant growth regulators operate by various modes of action. For example, onium-
type plant
growth retardants such as chlormequat-chloride and mepiquat-chloride, that
possess a
positively charged ammonium, phosphonium or sulphonium group, function by
blocking the
synthesis of gibberellin early in the biosynthetic pathway. Growth retardants
comprising a
nitrogen-containing heterocycle, such as flurprimidol, paclobutrazol and
uniconazole-P, act
as inhibitors of monooxygenases that catalyse oxidative steps in gibberellin
biosynthesis.
Structural mimics of 2-oxoglutaric acid, such as the acylcyclohexanediones
trinexapac-ethyl
and prohexadione-calcium, interfere with the late steps of gibberellin
biosynthesis. Other
plant growth regulators, such as mefluidide, inhibit cell division and
differentiation.
Plant growth regulators such as trinexapac-ethyl are commonly used on crops to
reduce the
risk of lodging through stem thickening and shortening, and improved rooting.
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In some cases, active ingredients have been shown to be more effective when
mixed with
other active ingredients compared to when applied individually, and this is
referred to as
"synergism", since the combination demonstrates a potency or activity level
exceeding that
which it would be expected to have based on knowledge of the individual
potencies of the
components. It has been found that combinations of trinexapac-ethyl and
prohexadione-
calcium provide a synergistic growth regulation effect. Such combinations are
also useful in
providing an improved plant growth regulation effect in crop plants because of
the strong
plant growth regulation effect of trinexapac-ethyl combined with the fast
acting plant growth
regulation effect of prohexadione-calcium. Additionally, co-application of two
plant growth
regulating compounds results in a growth regulation effect that is the same or
better than that
of either compound applied alone, using a lower concentration of each plant
growth
regulator. This enables the composition to be applied at an earlier growth
stage of the crop
without causing phytotoxicity.
According to the present invention, there is provided a method for regulating
the growth of
crop plants, comprising applying to the plants, plant parts, plant propagation
material, or a
plant growing locus, trinexapac-ethyl and prohexadione-calcium in a
synergistically effective
amount.
The term `regulating the growth' includes restricting shoot growth, promoting
root growth,
stunting, and the like.
The term `plants' refers to all physical parts of a plant, including seeds,
seedlings, saplings,
roots, tubers, stems, stalks, foliage and fruits.
The term `plant propagation material' denotes generative parts of the plant,
such as seeds,
which can be used for the multiplication of the latter, and vegetative
material, such as
cuttings or tubers, for example potatoes. In particular, it includes seeds (in
the strict sense),
roots, fruits, tubers, bulbs, rhizomes and parts of plants. Germinated plants
and young plants
which are to be transplanted after germination or after emergence from the
soil, may also be
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mentioned - these young plants may be protected before transplantation by a
total or partial
treatment by immersion. Suitably "plant propagation material" is understood to
denote seeds.
The term `plant growing locus' is intended to embrace the place on which the
plants are
growing, where the plant propagation materials of the plants are sown or where
the plant
propagation materials of the useful plants will be placed into the soil. An
example for such a
locus is a field, on which crop plants are growing.
The present invention also provides a method for enhancing crop plants,
comprising applying
to the plants, plant parts, plant propagation material, or a plant growing
locus, trinexapac-
ethyl and prohexadione-calcium in a synergistically effective amount.
According to the present invention, `enhancing crop plants' means improving
plant quality
and/or plant vigour and/or tolerance to stress factors, any of which may lead
to increased
yield. In one embodiment, the present invention relates to a method for
improving plant
yield, comprising applying to the plant, plant part, plant propagation
material, or a plant
growing locus, trinexapac-ethyl and prohexadione-calcium. Such improved yield
may be as
a result of improved root growth. In a further embodiment, the present
invention relates to a
method for improving plant vigour and/or plant quality, and/or plant tolerance
to stress
factors, comprising applying to the plant, plant part, plant propagation
material, or a plant
growing locus, trinexapac-ethyl and prohexadione calcium.
According to the present invention, an improvement in plant vigour means that
certain traits
are improved qualitatively or quantitatively when compared with the same trait
in a control
plant which has been grown under the same conditions in the absence of the
method of the
invention. Such traits include, but are not limited to, early and/or improved
germination,
improved emergence, the ability to use less seeds, increased root growth, a
more developed
root system, increased shoot growth, increased tillering, stronger tillers,
more productive
tillers, increased or improved plant stand, less plant verse (lodging), an
increase and/or
improvement in plant height, an increase in plant weight (fresh or dry),
bigger leaf blades,
greener leaf colour, increased pigment content, increased photosynthetic
activity, earlier
flowering, homogenous flowering, longer panicles, early grain maturity,
increased seed, fruit
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or pod size, increased pod or ear number, increased seed number per pod or
ear, increased
seed mass, enhanced seed filling, less dead basal leaves, delay of senescence,
improved
vitality of the plant and/or less inputs needed (e.g. less fertiliser, water
and/or labour needed).
A plant with improved vigour may have an increase in any of the aforementioned
traits or any
combination or two or more of the aforementioned traits. Suitably, the method
of the present
invention increases plant height, plant weight and/or provides enhanced
germination.
According to the present invention, an improvement in plant quality means also
that certain
traits are improved qualitatively or quantitatively when compared with the
same trait in a
control plant which has been grown under the same conditions in the absence of
the method
of the invention. Such traits include, but are not limited to, improved visual
appearance of
the plant (e.g. improved colour, density, uniformity, compactness),, reduced
ethylene
(reduced production and/or inhibition of reception), improved quality of
harvested material,
e.g. seeds, fruits, leaves, vegetables (such improved quality may manifest as
improved visual
appearance of the harvested material, improved carbohydrate content (e.g.
increased
quantities of sugar and/or starch, improved sugar acid ratio, reduction of
reducing sugars,
increased rate of development of sugar), improved protein content, improved
oil content and
composition, improved nutritional value, reduction in anti-nutritional
compounds, improved
organoleptic properties (e.g. improved taste) and/or improved consumer health
benefits (e.g.
increased levels of vitamins and anti-oxidants)), improved post-harvest
characteristics (e.g.
enhanced shelf-life and/or storage stability, easier processability, easier
extraction of
compounds) and/or improved seed quality (e.g. for use in following seasons). A
plant with
improved quality may have an increase in any of the aforementioned traits or
any
combination or two or more of the aforementioned traits.
According to the present invention, an improved tolerance to stress factors
means that certain
traits are improved qualitatively or quantitatively when compared with the
same trait in a
control plant which has been grown under the same conditions in the absence of
the method
of the invention. Such traits include, but are not limited to, an increased
tolerance and/or
resistance to abiotic stress factors which cause sub-optimal growing
conditions such as
drought (e.g. any stress which leads to a lack of water content in plants, a
lack of water
uptake potential or a reduction in the water supply to plants), cold exposure,
heat exposure,
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osmotic stress, UV stress, flooding, increased salinity (e.g. in the soil),
increased mineral
exposure, ozone exposure, high light exposure and/or limited availability of
nutrients (e.g.
nitrogen and/or phosphorus nutrients). A plant with improved tolerance to
stress factors may
have an increase in any of the aforementioned traits or any combination or two
or more of the
5 aforementioned traits. In the case of drought and nutrient stress, such
improved tolerances
may be due to, for example, more efficient uptake, use or retention of water
and nutrients.
Suitably, the method of the present invention increases tolerance of plants to
drought.
Any or all of the above crop enhancements may lead to an improved yield by
improving e.g.
plant physiology, plant growth and development and/or plant architecture. In
the context of
the present invention `yield' includes, but is not limited to, (i) an increase
in biomass
production, grain yield (e.g. grain size, grain number, grain density), starch
content, oil
content and/or protein content, which may result from (a) an increase in the
amount produced
by the plant per se or (b) an improved ability to harvest plant matter, (ii)
an improvement in
the composition of the harvested material (e.g. improved sugar acid ratios,
improved oil
composition, increased nutritional value, reduction of anti-nutritional
compounds, increased
consumer health benefits) and/or (iii) an increased/facilitated ability to
harvest the crop,
improved processability of the crop and/or better storage stability/shelf
life. Increased yield
of an agricultural plant means that, where it is possible to take a
quantitative measurement,
the yield of a product of the respective plant is increased by a measurable
amount over the
yield of the same product of the plant produced under the same conditions, but
without
application of the present invention. According to the present invention, it
is preferred that
the yield be increased by at least 0.5%, more preferred at least 1%, even more
preferred at
least 2%, still more preferred at least 4%, preferably 5% or even more.
Any or all of the above crop enhancements may also lead to an improved
utilisation of land,
i.e. land which was previously unavailable or sub-optimal for cultivation may
become
available. For example, plants which show an increased ability to survive in
drought
conditions, may be able to be cultivated in areas of sub-optimal rainfall,
e.g. perhaps on the
fringe of a desert or even the desert itself.
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The term `synergistically effective amount' indicates the quantity of such
compounds which
is capable of modifying the effect on the growth of plants, where said effect
is greater than
the sum of the effects obtained by applying each of the compounds
individually.
In the present invention, the mixture ratio of trinexapac-ethyl to
prohexadione-calcium at
which the growth regulation effect is synergistic lies within the range from
about 1:1000 to
about 1000:1 by weight. Suitably, the mixture ratio of trinexapac-ethyl to
prohexadione-
calcium is from about 1:100 to about 100:1 by weight. More suitably, the
mixture ratio of
trinexapac-ethyl to prohexadione-calcium is from about 10:1 to about 1:10 by
weight. More
suitably, the mixture ratio is from about 5:1 to 1:5; more suitably still it
is from 2:1 to 1:2.
The rate of application of the compounds of the present invention may vary
within wide
limits and depends upon the nature of the soil, the method of application, the
target insect
pest to be controlled, the prevailing climatic conditions, and other factors
governed by the
method of application and the time of application. The compounds of the
present invention
are generally each applied at a rate of 0.001 to 4 kg/ha, especially from
0.005 to I kg/ha, in
particular of 0.01 to 0.5 kg/ha. In particular, the compounds of the present
invention are each
applied at a rate of 0.01 to 0.2 kg/ha. Suitably, the trinexapac-ethyl is
applied at a rate from
about 25 to about 100 g ai/ha, and prohexadione-calcium is applied at a rate
from about 25 to
about 100 g ai/ha.
If desired, it is possible to use one or more additional plant growth
regulators in combination
with trinexapac-ethyl and prohexadione-calcium in accordance with the present
invention.
The method of the present invention may be applied to any dicotyledon crops
such as beet
(such as sugar beet or fodder beet); fruits (such as pomes, stone fruits or
soft fruits, for
example apples, pears, plums, peaches, almonds, cherries, strawberries,
raspberries or black-
berries); leguminous plants (such as beans, lentils, peas or soybeans); oil
plants (such as rape,
mustard, poppy, olives, sunflowers, coconut, castor oil plants, cocoa beans or
groundnuts);
cucumber plants (such as marrows, cucumbers or melons); fibre plants (such as
cotton, flax,
hemp or jute); citrus fruit (such as oranges, lemons, grapefruit or
mandarins); vegetables
(such as spinach, lettuce, cabbages, carrots, tomatoes, potatoes, cucurbits or
paprika);
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lauraceae (such as avocados, cinnamon or camphor); tobacco; nuts; coffee; tea;
vines; hops;
durian; bananas; natural rubber plants; and ornamentals (such as flowers,
shrubs, broad-
leaved trees or evergreens, for example conifers). This list does not
represent any limitation.
In one embodiment, the crop plants are oil plants. In particular, the crop
plants are oil seed
rape plants.
Crops include those that have been rendered tolerant to herbicides like
bromoxynil or classes
of herbicides (such as HPPD inhibitors, ALS inhibitors (for example
primisulfuron,
prosulfuron and trifloxysulfuron), EPSPS (5-enol-pyrovyl-shikimate-3-phosphate-
synthase)
inhibitors, GS (glutamine synthetase) inhibitors or PPO (protoporphyrinogen-
oxidase)
inhibitors) as a result of conventional methods of breeding or genetic
engineering. An
example of a crop that has been rendered tolerant to imidazolinones, e.g.
imazamox, by
conventional methods of breeding (mutagenesis) is Clearfield summer rape
(Canola).
Examples of crops that have been rendered tolerant to herbicides or classes of
herbicides by
genetic engineering methods include glyphosate- and glufosinate-resistant
maize varieties
commercially available under the trade names RoundupReady , Herculex IO and
LibertyLink . Crops also includes plants that have been transformed by the use
of
recombinant DNA techniques so that they are capable of synthesising one or
more selectively
acting toxins, such as are known, for example, from toxin-producing bacteria,
especially
those of the genus Bacillus. Crops also includes plants which have been
transformed by the
use of recombinant DNA techniques so that they are capable of synthesising
antipathogenic
substances having a selective action, such as, for example, the so-called
"pathogenesis-related
proteins". Examples of such antipathogenic substances and transgenic plants
capable of
synthesising such antipathogenic substances are known, for example, from EP-A-
O 392 225,
WO 95/33818, and EP-A-O 353 191. The methods of producing such transgenic
plants are
generally known to the person skilled in the art and are described, for
example, in the
publications mentioned above.
Examples of monocotyledon crops include cereals (wheat, millet, sorghum, rye,
triticale,
oats, barley, teff, spelt, buckwheat, fonio and quinoa), rice, maize (corn),
turfgrass and sugar
cane.
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The trinexapac-ethyl and prohexadione-calcium of the present invention may be
applied
either simultaneously or sequentially in any order. If administered
sequentially, the
components may be administered in any order in a suitable timescale, for
example, with no
longer than I month, no longer than 1 week, or no longer than 24 hours between
the time of
administering the first component and the time of administering the last
component.
Suitably, the components are administered within a timescale of a few hours,
such as one
hour. If the trinexapac-ethyl and prohexadione-calcium are administered
simultaneously,
they may be administered separately or as a tank mix or as a pre-formulated
mixture. In one
embodiment the mixture or composition of the present invention may be applied
to the crop
plants as a seed treatment prior to planting.
When the method of the present invention refers to the application to crop
plants of a co-
formulated composition, the composition comprises both trinexapac-ethyl and
prohexadione-
calcium. The compounds may be homogeneously mixed together with other
formulation
components necessary to make the desired formulation type, as is known to
those skilled in
the art.
In one embodiment of the present invention, the trinexapac-ethyl and
prohexadione-calcium
are applied in the form of a composition comprising an agriculturally
acceptable carrier.
The compounds of the present invention may be used in unmodified form, but are
generally
formulated into compositions using formulation adjuvants, such as carriers,
solvents and
surface-active substances. The formulations can be in various physical forms,
for example
dusting powders, gels, wettable powders, water-dispersible granules, water-
dispersible
tablets, effervescent compressed tablets, emulsifiable concentrates,
microemulsifiable
concentrates, oil-in-water emulsions, oil flowables, aqueous dispersions, oil
dispersions,
suspoemulsions, capsule suspensions, emulsifiable granules, soluble liquids,
water-soluble
concentrates (with water or a water-miscible organic solvent as carrier), or
impregnated
polymer films. Such formulations can either be used directly or are diluted
prior to use.
Diluted formulations can be prepared, for example, with water, liquid
fertilizers, micro-
nutrients, biological organisms, oil or solvents. These formulations may
contain as little as
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about 0.5% to as much as about 95% or more by weight of active ingredient. The
optimum
amount for any given compound will depend on formulation, application
equipment and
nature of the plants to be controlled.
Wettable powders are in the form of finely divided particles which disperse
readily in water
or other liquid carriers. The particles contain the active ingredient retained
in a solid matrix.
Typical solid matrices include fuller's earth, kaolin clays, silicas and other
readily wet
organic or inorganic solids. Wettable powders normally contain about 5% to
about 95% of
the active ingredient plus a small amount of wetting, dispersing or
emulsifying agent.
Emulsifiable concentrates are homogeneous liquid compositions dispersible in
water or other
liquid and may consist entirely of the active compound with a liquid or solid
emulsifying
agent, or may also contain a liquid carrier, such as xylene, heavy aromatic
naphthas,
isophorone and other non-volatile organic solvents. In use, these concentrates
are dispersed
in water or other liquid and normally applied as a spray to the area to be
treated. The amount
of active ingredient may range from about 0.5% to about 95% of the
concentrate.
Granular formulations include both extrudates and relatively coarse particles
and are usually
applied without dilution to the area in which suppression of vegetation is
desired. Typical
carriers for granular formulations include fertiliser, sand, fuller's earth,
attapulgite clay,
bentonite clays, montmorillonite clay, vermiculite, perlite, calcium
carbonate, brick, pumice,
pyrophyllite, kaolin, dolomite, plaster, wood flour, ground corn cobs, ground
peanut hulls,
sugars, sodium chloride, sodium sulphate, sodium silicate, sodium borate,
magnesia, mica,
iron oxide, zinc oxide, titanium oxide, antimony oxide, cryolite, gypsum,
diatomaceous earth,
calcium sulphate and other organic or inorganic materials which absorb or
which can be
coated with the active compound. Particularly suitable is a fertiliser granule
carrier.
Granular formulations normally contain about 5% to about 25% active
ingredients which may
include surface-active agents such as heavy aromatic naphthas, kerosene and
other petroleum
fractions, or vegetable oils; and/or stickers such as dextrins, glue or
synthetic resins. The
granular substrate material can be one of the typical carriers mentioned above
and/or can be a
fertiliser material e.g. urea/formaldehyde fertilisers, ammonium, liquid
nitrogen, urea,
potassium chloride, ammonium compounds, phosphorus compounds, sulphur, similar
plant
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nutrients and micronutrients and mixtures or combinations thereof. The
trinexapac-ethyl and
prohexadione-calcium may be homogeneously distributed throughout the granule
or may be
spray impregnated or absorbed onto the granule substrate after the granules
are formed.
5 Encapsulated granules are generally porous granules with porous membranes
sealing the
granule pore openings, retaining the active species in liquid form inside the
granule pores.
Granules typically range from 1 millimetre to 1 centimetre, preferably I to 2
millimetres in
diameter. Granules are formed by extrusion, agglomeration or prilling, or are
naturally
occurring. Examples of such materials are vermiculite, sintered clay, kaolin,
attapulgite clay,
10 sawdust and granular carbon. Shell or membrane materials include natural
and synthetic
rubbers, cellulosic materials, styrene-butadiene copolymers,
polyacrylonitriles, polyacrylates,
polyesters, polyamides, polyureas, polyurethanes and starch xanthates.
Dusts are free-flowing admixtures of the active ingredient with finely divided
solids such as
talc, clays, flours and other organic and inorganic solids which act as
dispersants and carriers.
Microcapsules are typically droplets or granules of the active material
enclosed in an inert
porous shell which allows escape of the enclosed material to the surroundings
at controlled
rates. Encapsulated droplets are typically about 1 to 50 microns in diameter.
The enclosed
liquid typically constitutes about 50 to 95% of the weight of the capsule and
may include
solvent in addition to the active compound.
Other useful formulations for plant growth regulation applications include
simple solutions of
the active ingredients in a solvent in which it is completely soluble at the
desired
concentration, such as acetone, alkylated naphthalenes, xylene and other
organic solvents.
Pressurised sprayers, wherein the active ingredient is dispersed in finely-
divided form as a
result of vaporisation of a low boiling dispersant solvent carrier, may also
be used.
Many of the formulations described above include wetting, dispersing or
emulsifying agents.
Examples are alkyl and alkylaryl sulphonates and sulphates and their salts,
polyhydric
alcohols; polyethoxylated alcohols, esters and fatty amines. These agents,
when used,
normally comprise from 0.1% to 15% by weight of the formulation.
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Suitable agricultural adjuvants and carriers, either formulated together
and/or added
separately, that are useful in formulating the compositions of the invention
in the formulation
types described above are well known to those skilled in the art. Suitable
examples of the
different classes are found in the non-limiting list below.
Liquid carriers that can be employed include water, toluene, xylene, petroleum
naphtha, crop
oils, AMS; acetone, methyl ethyl ketone, cyclohexanone, acetic anhydride,
acetonitrile,
acetophenone, amyl acetate, 2-butanone, chlorobenzene, cyclohexane,
cyclohexanol, alkyl
acetates, diacetonalcohol, 1,2-dichloropropane, diethanolamine, p-
diethylbenzene, diethylene
glycol, diethylene glycol abietate, diethylene glycol butyl ether, diethylene
glycol ethyl ether,
diethylene glycol methyl ether, N,N-dimethyl formamide, dimethyl sulfoxide,
1,4-dioxane,
dipropylene glycol, dipropylene glycol methyl ether, dipropylene glycol
dibenzoate,
diproxitol, alkyl pyrrolidinone, ethyl acetate, 2-ethyl hexanol, ethylene
carbonate, 1,1,1-
trichloroethane, 2-heptanone, alpha pinene, d-limonene, ethylene glycol,
ethylene glycol
butyl ether, ethylene glycol methyl ether, gamma-butyrolactone, glycerol,
glycerol diacetate,
glycerol monoacetate, glycerol triacetate, hexadecane, hexylene glycol,
isoainyl acetate,
isobornyl acetate, isooctane, isophorone, isopropyl benzene, isopropyl
myristate, lactic acid,
laurylamine, mesityl oxide, methoxy-propanol, methyl isoamyl ketone, methyl
isobutyl
ketone, methyl laurate, methyl octanoate, methyl oleate, methylene chloride, m-
xylene, n-
hexane, n-octylamine, octadecanoic acid, octyl amine acetate, oleic acid,
oleylamine, o-
xylene, phenol, polyethylene glycol (PEG400), propionic acid, propylene
glycol, propylene
glycol monomethyl ether, p-xylene, toluene, triethyl phosphate, triethylene
glycol, xylene
sulfonic acid, paraffin, mineral oil, trichloroethylene, perchloroethylene,
ethyl acetate, amyl
acetate, butyl acetate, methanol, ethanol, isopropanol, and higher molecular
weight alcohols
such as amyl alcohol, tetrahydrofurfuryl alcohol, hexanol, octanol, etc.
ethylene glycol,
propylene glycol, glycerine, N-methyl-2-pyrrolidinone, and the like. Water is
generally the
carrier of choice for the dilution of concentrates.
Suitable solid carriers include talc, titanium dioxide, pyrophyllite clay,
silica, attapulgite clay,
kieselguhr, chalk, diatomaxeous earth, lime, calcium carbonate, bentonite
clay, fuller's earth,
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fertiliser, cotton seed hulls, wheat flour, soybean flour, pumice, wood flour,
walnut shell
flour, lignin and the like.
A broad range of surface-active agents are advantageously employed in both
said liquid and
solid compositions, especially those designed to be diluted with carrier
before application.
The surface-active agents can be anionic, cationic, non-ionic or polymeric in
character and
can be employed as emulsifying agents, wetting agents, suspending agents or
for other
purposes. Typical surface active agents include salts of alkyl sulfates, such
as
diethanolammonium lauryl sulphate; alkylarylsulfonate salts, such as calcium
dodecylbenzenesulfonate; alkylphenol-alkylene oxide addition products, such as
nonylphenol-C<sub></sub> 18 ethoxylate; alcohol-alkylene oxide addition products,
such as tridecyl
alcohol-C<sub></sub> 16 ethoxylate; soaps, such as sodium stearate;
alkylnaphthalenesulfonate salts,
such as sodium dibutylnaphthalenesulfonate; dialkyl esters of sulfosuccinate
salts, such as
sodium di(2-ethylhexyl) sulfosuccinate; sorbitol esters, such as sorbitol
oleate; quaternary
amines, such as lauryl trimethylammonium chloride; polyethylene glycol esters
of fatty acids,
such as polyethylene glycol stearate; block copolymers of ethylene oxide and
propylene
oxide; and salts of mono and dialkyl phosphate esters.
Other adjuvants commonly utilized in agricultural compositions include
crystallisation
inhibitors, viscosity modifiers, suspending agents, spray droplet modifiers,
pigments,
antioxidants, foaming agents, light-blocking agents, compatibilizing agents,
antifoam agents,
sequestering agents, neutralising agents and buffers, corrosion inhibitors,
dyes, odorants,
spreading agents, penetration aids, micronutrients, emollients, lubricants,
sticking agents, and
the like. The compositions can also be formulated with liquid fertilizers or
solid, particulate
fertiliser carriers such as ammonium nitrate, urea and the like.
Also, the present invention may optionally include one or more additional
pesticides such as
insecticides, nematicides, fungicides or herbicides or additional plant growth
regulators. Co-
application of pesticides with the present invention has the added benefit of
minimising
farmer time spent applying products to crops, since only a single application
may be required
to both provide growth regulation and control pests.
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13
According to the present invention, there is provided the use of a composition
comprising a
synergistically effective amount of trinexapac-ethyl and prohexadione-calcium,
for regulating
the growth of and/or enhancing crop plants, as described above. In one
embodiment, the crop
plants are dicotyledonous plants.
Compositions of the present invention may contain from about 0.001% to about
99% by
weight active ingredients. Suitably, the composition contains from about
0.001% to about
50% by weight active ingredients. More suitably, the composition contains from
about
0.001% to about 10% by weight active ingredients. More suitably, the
composition contains
from about 0.001% to about 1% by weight active ingredients. If the formulation
is in the
form of a concentrate, requiring dilution with water before use, it will
contain a higher
amount of active ingredients than a composition that is ready to use without
dilution.
Although the invention has been described with reference to preferred
embodiments and
examples thereof, the scope of the present invention is not limited. only to
those described
embodiments. As will be apparent to persons skilled in the art, modifications
and adaptations
to the above-described invention can be made without departing from the spirit
and scope of
the invention, which is defined and circumscribed by the attached claims.
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14
EXAMPLES
Example 1: Plant growth regulation on cereals
Plants were grown under greenhouse conditions and sprayed at growth stage 30-
32 (start of
stem elongation) of cereal plants with a boom sprayer. Trinexapac-ethyl
(treatment A) was
applied as Moddus ME250 formulation, and Prohexadione-Ca (treatment B) was
applied as
Viviful WG10 formulation with a standard flat fan nozzle at 2001/ha spray
volume.
13 days after application the plant growth reduction (%GR) of the shoot
(leaves and stem)
was evaluated visually compared to the untreated control. The expected plant
growth
reduction was calculated according to Colby (Colby 1967, Weeds 15, 20-22) and
compared
to evaluation data of sprayed plants.
Rate (g Spring-barley Winter-barley Winter-wheat Spring-wheat
Treatment a.i. / ha) Pasadena Hasso Arina Lona
GR Colby % GR Colby % GR Colby % GR Colby
A 50 0.0 - 5.0 - 5.0 - 3.3 -
A 25 0.0 - 0.0 - 0.0 - 1.7 -
B 50 1.7 - 5.0 - 3.3 - 3.3 -
B 25 0.0 - 0.0 - 0.0 - 0.0 -
A+B 50+25 8.3 0.0 11.7 5.0 13.3 5.0 11.7 3.3
A+B 50+50 15.0 1.7 16.7 9.8 13.3 8.2 11.7 6.6
A+B 25+25 6.7 0.0 6.7 0.0 5.0 0.0 3.3 1.7
A+B 25+50 11.7 1.7 11.7 5.0 18.3 3.3 11.7 4.9
The data shows that mixtures of trinexapac-ethyl and prohexadione-calcium
result in a higher
plant growth reduction that one would expect based on the activity of each
active ingredient
alone, indicating a synergistic effect.
Example 2: Plant growth regulation on corn
Corn plants of 4 different varieties were grown under greenhouse conditions
and sprayed at
growth stage 13 (3 leaves unfolded) with a boom sprayer. Trinexapac-ethyl was
applied as
Moddus ME250 formulation, and Prohexadion-Ca was applied as Viviful WG10
formulation with a standard flat fan nozzle at 200 1/ha spray volume. 33 days
after
application the plant growth reduction (%GR) of the shoot (leaves and stem)
was evaluated
visually compared to the untreated control. The expected plant growth
reduction was
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calculated according to Colby (Colby 1967, Weeds 15, 20-22) and compared to
evaluation
data of sprayed plants.
Rate (g Corn Corn Corn Corn
Treatment a.i. / ha) ECO5133 LG22.65 Maeva Ronaldinio
%GR Colby %GR Colby %GR Colby %GR Colby
A 100 6.7 - 11.7 - 6.7 - 3.3 -
A 50 1.7 - 3.3 - 3.3 - 0.0 -
A 25 1.7 - 0.0 - 1.7 - 0.0 -
B 100 0.0 - 13.3 - 18.3 - 1.7 _
B 50 0.0 - 1.7 - 5.0 - 0.0 _
B 25 0.0 - 0.0 - 1.7 - 0.0 -
A+B 100+50 16.7 6.7 20.0 13.1 23.3 11.3 8.3 3.3
A+B 50+25 3.3 1.7 8.3 3.3 15.0 4.9 0.0 0.0
A+B 50+100 13.3 1.7 15.0 16.2 20.0 21.1 8.3 1.7
A+B 25+50 1.7 1.7 6.7 1.7 13.3 6.6 3.3 0.0
5
The data shows that mixtures of trinexapac-ethyl and prohexadione-calcium
result in a higher
plant growth reduction that one would expect based on the activity of each
active ingredient
alone, indicating a synergistic effect.
