Fungicidal compositions based on fludioxonil

Details Fungicidal compositions based on fludioxonil Fungicidal compositions based on fludioxonil

2003-04-25

2004-09-28

Pryor, Alton N. (Department: 1616)

Plant protecting and regulating compositions

Plant growth regulating compositions

Plural active ingredients

C504S139000

Reexamination Certificate

active

06797672

ABSTRACT:

The present invention relates to novel fungicidal compositions for the treatment of phytopathogenic diseases of crop plants and against infestation on propagation stock of plants or on other vegetable material, especially phytopathogenic fungi, and to a method of combating phytopathogenic diseases on crop plants or in post-harvest storage and for seed dressing.
The invention relates in particular to the control or prevention of diseases in the post-harvest storage period of harvested fruits.
It has now been found that the use of
a) 4-(2,2-difluoro-1,3-benzodioxol-7-yl)pyrrole-3-carbonitrile (“fludioxonil”) (The Pesticide Manual, 11th. edition, 1997, 334), component I in association with
b) either 2-(thiazol-4-yl)benzimidazol, component IIA (“thiabendazole”) (The Pesticide Manual, 11th. edition, 1997, 701); or
1-(&bgr;-allyloxy-2,4-dichlorophenylethyl)imidazole, component IIB (“imazalil”) (The Pesticide Manual, 11th. edition, 1997, 410)
is particularly effective in combating or preventing fungal diseases of crop plants. These combinations exhibit synergistic fungicidal activity.
Favorable mixture ratios of the two active ingredients are I:II=20:1 to 1:20, preferably I:II=10:1 to 1:10 and 5:1 to 1:5.
The active ingredient combinations I+II according to the invention have very advantageous properties in the protection of plants and during post-harvest storage of fruits against the outbreak of disease.
The active ingredient combinations are effective against phytopathogenic fungi belonging to the following classes: Ascomycetes (e.g. Venturia, Podosphaera, Erysiphe, Monilinia, Sclerotinia, Mycosphaerella, Uncinula); Basidiomycetes (e.g. the genus Hemileia, Rhizoctonia, Tilletia, Puccinia); Fungi imperfecti (e.g. Botrytis, Helminthosporium, Rhynchosporium, Fusarium, Septoria, Cercospora, Alternaria, Penicillium spp., Pyricularia and
Pseudocercosporella herpotrichoides
).
With the present active ingredient compositions, the microorganisms appearing on plants or plant parts (fruits, flower, foliage, stems, tubers, roots) of different useful plants can be stopped or destroyed, whereby plant parts growing later also remain free from such microorganisms. They may also be used as post-harvest application or as dressing, or the treatment of plant propagation material, specially seeds.
Target crops for the areas of indication disclosed herein comprise within the scope of this invention e.g. the following species of plants: cereals (wheat, barley, rye, oats, rice, sorghum and related crops); beet (sugar beet and fodder beet); pomes, stone fruit and soft fruit (apples, pears, plums, peaches, almonds, cherries, strawberries, raspberries and blackberries); leguminous plants (beans, lentils, peas, soybeans); oil plants (rape, mustard, poppy, olives, sunflowers, coconut, castor oil plants, cocoa beans, groundnuts); cucumber plants (marrows, cucumbers, melons); fibre plants (cotton, flax, hemp, jute); citrus fruit (oranges, lemons, grapefruit, mandarins); vegetables (spinach, lettuce, asparagus, cabbages, carrots, onions, tomatoes, potatoes, paprika); lauraceae (avocados, cinnamon, camphor); or plants such as maize, tobacco, nuts, coffee, sugar cane, tea, vines, hops, turf, bananas and natural rubber plants, as well as ornamentals (flowers, shrubs, broad-leaved trees and evergreens, such as conifers) and their seeds. This list does not represent any limitation.
The combinations of the present invention may also be used in the area of protecting technical material against attack of fungi. Technical areas include wood, paper, leather, constructions, cooling and heating systems, ventilation and air conditioning systems, and the like. The combinations according the present invention can prevent the disadvantageous effects such as decay, discoloration or mold.
Throughout this document the expression combination stands for the various combinations of the components I and II, e.g. in a single “ready-mix” form, in a combined spray mixture composed from separate formulations of the single active ingredient components, e.g. a “tank-mix”, and in a combined use of the single active ingredients when applied in a sequential manner, i.e. one after the other with a reasonable short period, e.g. a few hours or days. The order of applying the components I and II is not essential for working the present invention.
The combinations according to the present invention are particularly effective against Botrytis spp., Fusarium spp. and Penicillium spp., in particular against pathogens of fruits plants such as citrus, pomes, stone fruits and soft fruits and bananas as well as potatoes and the corresponding fruits during post-harvest storage.
The amount of combination of the invention to be applied, will depend on various factors such as the compound employed, the subject of the treatment (plant, soil, post-harvest, seed), the type of treatment (e.g. spraying, dusting, seed dressing), the purpose of the treatment (prophylactic or therapeutic), the type of fungi to be treated and the application time.
It has been found that the use of compounds IIA and IIB in combination with the compound of formula I surprisingly and substantially enhance the effectiveness of the latter against fungi, and vice versa. Additionally, the method of the invention is effective against a wider spectrum of such fungi that can be combated with the active ingredients of this method, when used solely.
The invention also relates to a method of controlling fungi, which comprises treating a site, for example a plant, its locus of growth, or during post-harvest storage of fruits, that is infested or liable to be infested by fungi with the active component I and with the active component II in any desired order or simultaneously.
The weight ratio of I:II is so selected as to give a synergistic fungicidal action. The synergistic action of the composition is apparent from the fact that the fungicidal action of the composition of I+II is greater than the sum of the fungicidal actions of I and II.
The method of the invention comprises applying to the plants to be treated or the locus thereof in admixture or separately, a fungicidally effective aggregate amount of a compound I and a compound of component b).
The term locus as used herein is intended to embrace the fields on which the treated crop plants are growing, or where the seeds of cultivated plants are sown, or the place where the seed will be placed into the soil. The term seed is intended to embrace plant propagating material such as cuttings, seedlings, seeds, germinated or soaked seeds.
The combinations are applied by treating the fungi or the seeds, plants or materials threatened by fungus attack, or the soil with a fungicidally effective amount of the active ingredients.
The novel combinations are extremely effective against phytopathogenic fungi. Some of the have a systemic action and can be used as foliar and soil fungicides, for post-harvest fruits during storage and for seed dressing.
The agents may be applied before or after infection of the materials, plants, during post-harvest storage of fruits or seeds by the fungi.
When applied to the plants or the post-harvest fruits the compound of formula I is applied at a rate of 10 to 150 g/100 l, particularly 20 to 100 g/100 l, e.g. 20, 50, or 100 g/100 l, in association with 10 to 1000 g/100 l, particularly 30 to 600 g/100 l, e.g. 30 g/100 l, 40 g/100 l, 75 g/100 l, 80 g/100 l, 100 g/100 l, 125 g/100 l, 150 g/100 l, 175 g/100 l, 200 g/100 l, 300 g/100 l, 500 g/100 l, depending on the class of chemical employed as component b). Where the component b) is compound IIA for example 50 to 200 g a.i./100 l is applied in association with the compound of formula I. Where the component b) is compound IIB for example 25 to 200 g a.i./100 l is applied in association with the compound of formula I. In agricultural practice the application rates of the combination depend on the type of effect desired, and range from 5 to 1000 g of active ingredient per 100 l.
When the active ingredients are used for treating seed, rates of 0.001 to 50

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