NO147091B - FUNGICID PREPARATION INCLUDING A MIXTURE OF ((1,2-ETHANETYLBIS (CARBAMODITIOATOL)) (2 -)) - MANGANE AND A PYRIMIDINE METHANOL COMPOUND - Google Patents

Description

The present invention relates to a preparation which consists of or contains a mixture of [[1,2-ethanediylbis[carbamo-dithioato] ] (2- )]-manganese and a pyrimidine methanol with the formula:

where X is chlorine or fluorine, to reduce the prevalence and degree of fungal infections in cultivated plants, especially cereals.

[[1,2-ethanediylbis[carbamodithioato]](2- )]-manganese is a known compound (cf. US patents 2,504,404 and 2,710,822)

with the generic name "Maneb". The pyrimidine methanols of formula (I) are also known and can be prepared by the method described in British patent no. 1,218,623. The compound of formula (I) where X is fluorine is preferred.

The new combination according to the present invention is surprisingly effective when it comes to regulating or combating fungal infections in cereals. It is particularly active when used as a seed dressing - to combat several widespread diseases, of which the following are representative:

1. Diseases of barley (Hordeum vulgare)

Pyrenophora graminea

Cocholiobolus sativus

Calonectria nivalis

Typhula incarnata

Erysiphe graminis

2. Diseases of oats (Avena sativa)

Pyrenophora avenae

3. Diseases of wheat

Cerosporekka geroitrucgiudes

Tilletia spp.

Calonectria nivalis

Leptosphaeria nodorum

Although the present new preparation is preferably used in the form of a seed dressing, good results have also been achieved when the preparation is used on leafy plants in the time from the beginning of the growth period up to harvest, the frequency and duration of the treatment being determined based on the degree of attack by the actual or expected disease.

The pyrimidine methanol compound is preferably applied to seeds

in an amount of 0.05-0.8 g/kg, preferably in an amount of 0.1 g/kg for wheat and 0.2 g/kg for barley, while Maneb is preferably applied in an amount of 0, 2-1.6 g/kg, preferably in an amount of about:0.8 g/kg seed. A preferred ratio between the pyrimidine methanol and Maneb is from 1:2 to 1:32, preferably 1:4 to 1:8.

The present preparation is preferably used in the form of a fungicidal preparation comprising the pyrimidine methanol compound and Maneb in connection with a non-phytotoxic, inert carrier.

Present preparations may comprise 5-90% by weight of active ingredients and will usually be in the form of a wettable powder or dust.

Wettable powders or dusts comprise an intimate mixture of the active ingredients, one or more inert carriers and suitable surfactants. The inert carrier can be selected from the attapulgite clays, montmorillonite clays, diatomaceous earth, kaolins, mica, talc and purified silicates. Effective surfactants are found among the sulfonated lignins, naphthalene sulfonates and condensed naphthalene sulfonates, alkyl succinates, alkylbenzene sulfonates, alkyl sulfates and nonionic surfactants such as ethylene oxide adducts of phenol. When the present preparation is used as a seed dressing, it will also preferably include an adhesive to bind the preparation to the seeds,

a pigment to indicate whether a particular seed variety has been treated, an insecticide and a bird repellent.

Illustrative wettable powders covered by the present invention are those with the following composition:

Wettable powders

Illustrative dust preparations are those with the following compositions:

Dust

The following specific examples further illustrate the invention. In these examples, CCPM represents the compound α-(2-chlorophenyl)-α-(4-chlorophenyl)-5-pyrimidinemethanol and CFPM represents the compound α-(2-chlorophenyl)-α-(4-fluorophenyl)-5-pyrimidinemethanol. Examples 1-3 illustrate the production of wettable powders, while examples 4-5 concern dust preparations.

Example 1

Example 2

<*>Lindan is the generic name for γ-1, 2,3,4,5,6-hexachloro-cyclohexane.

Example 3

In the above-mentioned examples 1-3, the size of the active ingredients is reduced in a conventional manner and then mixed with other ingredients in conventional mixing devices. The mixture is then ground in a liquid energy mill to a size in the range of 1-10 ym. The mixture is then mixed again and deaerated before packaging.

Example 4

Example 5

In examples 4 and 5, the size of the active ingredients is reduced in a conventional manner and then mixed with other ingredients, the oil or the surfactant being injected into the mixture. The mixture is then ground to a particle size in the range of 5-50 ym. The mixture is mixed again and deaerated before packaging.

When used as a seed dressing in connection with the control of Septoria (Leptosphaeria nodorum) in wheat, the preparation in example 1 produced a synergistic effect.

Comparison experiment

Wheat seed infected with Septoria (Leptosphaeria nodarum) is treated with the preparation in example 1 in an amount such that 0.2 g of the pyrimidine methanol and 0.8 g of the "Maneb" compound are obtained per kg of seeds. This treatment resulted in 92% healthy wheat plants. Treatment with an identical preparation, but omitting the "Maneb" compound, and at an amount of 0.2 g of the pyrimidine methanol, gave only 7 2.8% healthy plants. Treatment with a further identical preparation,

but this time omitting the pyrimidine methanol, and using an amount of 0.8 g of the "Maneb" compound gave only 52.7% healthy plants. Using the "Colby" formula, the expected effect based on the individual "Maneb" and pyrimidine methanol results is 87% healthy plants. On this background, 92% healthy plants are observed from the combined application and it will appear that an unexpected or surprising increase is observed when the combination is used.

Claims (1)

Fungicidal preparation, characterized in that it consists of or contains a mixture of [[1,2-ethanediylbis[carbamodithioato]](2- )]-manganese and a pyrimidine methanol with the formula: where X is chlorine or fluorine.