IE47245B1 - Fungicidal combinations - Google Patents

Abstract

A fungicidal composition and a process for the fungicidal treatment of crops are described. The composition consists of a mixture of [[1,2-ethanediylbis[carbamodithioato]](2-)]manganese and pyrimidinemethanol, optionally mixed with a non-phytotoxic, inert vehicle, diluent or excipient. Application to the treatment of cereals, in particular of barley and of winter barley, of oats and of wheat.

Description

The present invention relates to a method of reducing the incidence and severity of fungal infections in cultivated plants especially cereals, to a novel combination useful in such treatment and to fungicidal formulations containing said novel combination.

According to a first aspect of the present invention there is provided a novel combination of [[l,2-ethanediylbis[carbamodithioato]](2~)]-manganese and a pyrimidine methanol of formula (I) · where X is chlorine or fluorine. [[l,2-Ethanediylbis[carbamodithioato]](2-)3-mangane3e is a known compound (see U.S. Patents Nos. 2,504,404 and 2,710,822) having the generic name Maneb'V The pyrimidine methanols of formula (I) are also known and can be prepared by the process described in Patent Specification No. 32255. The compound of formula (1) where X is fluorine is preferred.

The novel combination of the present invention is surprisingly effective in controlling or combatting fungal infections in cereals. It is especially active when applied as a seed dressing, controlling many important diseases of which the following are e representative sample ϊ 1. Diseases of Barley (Hordeum vulgare) Pytenophora graminea Cochliobolus sativus Calonectria nivalis Typhula incamata Erysiphae gramlnis -247245 2. Diseases of Oats (Avena sativa) Pyrenophora avenae 3. Diseases of Wheat Cercosporella herpotrichoides Tilletia spp.

Calonectria nivalis Leptosphaeria nodorum Accordingly, in a second aspect of the invention there is provided a method of reducing the incidence or severity of fungal infections in cereals which comprises dressing seeds of said cereals with a chemotherapeuticaliy effective amount of the novel combination defined above.

Although the novel combination is preferably utilised in the form of a seed dressing, beneficial results have also been derived from foliar application of the novel combination at any time after crop emergence up until harvest; the actual frequency and duration of treatment being determined by the severity of the actual or expected disease. The components of the combination may be applied sequentially or simultaneously to the crop to be treated.

The pyrimidine methanol is preferably applied to the seeds in an amount of from 0.05 to 0.8 g/Kg, most preferably at O,lg/Kg for wheat and 0.2 g/Kg, for barley,of seed whereas the Maneb is preferably applied in an amount of from 0.2 to 1.6 g/Kg, most preferably at approximately 0,8 g/Kg, of seed~ A preferred ratio of the pyrimidine methanol to the Maneb is from 1 : 2 to 1 : 32, preferably Γ; 4 to 1 : 8, The novel combination of the invention is preferably utilised in the form of a fungicidal formulation comprising the pyrimidine methanol and the Maneb associated with a non-phytotoxic, inert carrier therefor.

The fungicidal formulations of the invention may comprise from 5 to 907. by weight of active ingredients and will usually be in the form of a wettable powder or dust. -347245 Wettable powders or dusts comprise an intimate mixture of the active ingredients, one or more inert carriers and appropriate surfactants. The inert carrier may be chosen from the attapulgite clays, the montmorillonite clays, the diatomaceous earths, kaolins, micas, talcs and purified silicates. Effective surfactants may be found among the sulfonated lignins, the naphthalene sulfonates and condensed naphthalene sulfonates, the alkyl succinates, the alkylbenzene sulfonates, the alkyl sulfates and nonionic surfactants such as ethylene oxide adducts of phenol. When used for seed dressing, formulations of the invention will also preferably comprise an adhesive to bind the formulation to the seeds, a pigment to indicate whether or not any particular batch of seed has been treated, an insecticide and a bird-repellent.

Illustrative of wettable powders falling within the scope of the invention are those having the following composition : Wettable Powders % by weight Pyrimidine methanol Maneb Insecticide Bird-repellent Wetting agent(s) Dispersiig agent Anticaking Adhesive Pigment Inert(s) Illustrative of dust formulations of value having the following compositions : 2.5 to 15 to 40 0 to 25 0 to 25 2 to 10 0 to 10 1 to 10 0 to 5 0 to 5 to 100 in the invention -447245 Dust 7. by weight Pyrimidine methanol 2.5 to 20 Maneb 20 to 40 Insecticide 0 to 25 Bird-repellent 0 to 25 Surfactant(s) 0 to 10 Oil 0 to 10 Pigment 0 to 5 Inert(s) to 100 The following non-limitative specific examples are given to further illustrate the Invention. In these examples, CCPM represents the compound a-(2-chlorophenyl)-a-(4-chlorophenyl)-5-pyrimidine methanol and CFPM represents the compound a-(2-chlorophenyl)-a-(4-fluorophenyl)~5-pyrimidine methanol. Examples 1 to 3 illustrate embodiments of wettable powders whereas Examples and 5 are concerned with dust formulations. -547245 EXAMPLE 1 % by weight CFPM 8 Maneb 52 Sodium alpha olefin sulphonate 5 Sodium lignin sulphonate 5 Silica 5 Kaolin 45 EXAMPLE 2 %, by weight CFPM 6.5 Maneb 26.5 Lindane* 16.5 Sodium alkyl aryl sulphonate 2 Silica 1.5 Polyvinyl pyrrolidone 1 Kaolin 46 EXAMPLE 3 % by weight CCPM 6.5 Maneb 26.5 Lindane* 16.5 Anthraquinone 16.5 Sodium N-alkyl-N-palmitoyltaurate 5 Sodium lignin sulphonate 5 Silica 5 Permanent red 4 Kaolin 15 -647245 *Lindane Is the generic name for Y-l,2,3,4,5,6-hexachlorocyclohexane.

In the above Examples 1 to 3, the active ingredients are reduced in size by conventional means and then blended with the other ingredients in conventional mixing equipment. The blend is then milled in a fluid energy mill to a size range from 1 to 10 microns. The mixture is then reblended and deaerated prior to packaging.

EXAMPLE 4 CFPM Maneb IO W Motor oil Red iron oxide Talc % by weight EXAMPLE 5 7, by weight CCPM 20 Maneb 40 Alkyl phenol ethylene oxide condensate 4 Permanent red 4 Talc 32 In Examples 4 and 5, the active ingredients are reduced in size by conventional means and then blended with other ingredients, the oil or surfactant being sprayed into the blend. The mixture is then milled to give particles of sizes from 5-50 microns. The mixture is reblended and deaerated prior to packaging.

The formulation of Example 1 when applied as a seed dressing in connection with the control of Septoria (Leptosphaeria nodorum) in wheat gave a synergistic effect.

Claims (7)

1. I. A carbinatiah of J}jl,2-ethanediyfois[cai±)amodithioatojj(2-)} -manganese and a pyrimidine methanol of formula (I) : 5 where X is chlorine or fluorine.

2. A ccmbination according to claim 1 wherein the ratio of pyrimidine methanol: maneb is in the range 1 : 2 to 1 : 32.

3. A coibinatian according to claim 2 wherein the ratio is in the range 1 : 6 to 1 : 8. IO

4. A fungicidal formulation conprising a carbinaticn as claimed in Claim 1 to 3 associated with a ηαη-phytotoxic, inert carrier therefor.

5. A formulation according to claim 4 wiiich canprises 5-90% active ingredients.

6. A formulation according to claim 4 and 5 which is a wettable 15 pcwder or dust.

7. A method of treating cereal seeds to reduce the incidence or severity of fungal infections in the cereal crop grown therefran which comprises applying a ccnbinaticn as claimed in Claims 1 - 3, or a formulation as claimed in Claims 4 - 6, to said cereal seeds.