SE447783B - FUNGICID PREPARATION CONTAINING A TRIAZOLIC COMPOUND AND A BENZIMIDAZOLE - Google Patents

Description

The invention also relates to a method for treating fungal infections on plants, in particular on grain and grapes, in which a fungicidal effective amount of a fungicidal preparation as above is applied to the plants. The preparation is preferably applied to the leaves at any time after the crop has grown and until the harvest takes place, the amount and frequency of application being determined by the extent or expected extent of the fungal disease. However, it is a particular advantage obtained when using the above-mentioned combinations that a lower frequency of the treatment, e.g. only once every two or three weeks, for the control of powdery mildew infections on grapes, can be used effectively, obtaining a valuable reduction in labor costs.

The components of the formulations of the present invention may be applied sequentially or simultaneously to the treated plants, with the latter method being preferred. The compound of formula I is preferably applied in an amount of Fä - 500 g / ha in the treatment of grapes, while compounds of formula II are preferably applied in amounts of 100 - 3000 9 / ha. Thus, the ratio of compounds of formula I to compounds of formula II in combinations according to the invention may be in the range 5: 1 to 1: 300, with respect to weight. Preferably, the ratio of the compound of formula I to the compound of formula II is between 2: 1 and 1:25, 20 to 200 g / ha of the compound of formula I being applied, while 100 to 500 g / ha of the compound of formula II Can be used.

In order to simplify the preparation, storage and transport, the combinations of the compounds of formulas I and II are normally prepared as concentrates intended for dilution with water to the extent necessary to obtain the indicated yields easily. These concentrated preparations may contain 0.5 to 90% by weight, preferably 5 to 90% by weight, of active ingredients together with at least one inert non-phytotoxic carrier. The formulations are usually in the form of a wettable powder or powder or an aqueous suspension. Concentrates * 447 783 3 preparations are intended for suitable dilution with water before use. This formation of an aqueous dispersion can be carried out in conventional spray tanks.

Wettable powder or powder consists of an intimate mixture of the active ingredients, at least one inert carrier and suitable surfactants. The inert carrier can be attapulgite clay, montmorillonite clay, diatomaceous earth, kaolin, mica, talc or purified silicate. Effective detergents are sulfonated lignins, naphthalene sulfonates and fused naphthalene sulfonates, alkyl succinates, alkyl benzene sulfonates, alkyl sulfates and nonionic surfactants, e.g. ethylene oxide adducts of phenol. Wettable powders, which are within the scope of the invention, may have the following composition: Wettable powders Weight percent Compound of Formula I 0.25 - 10 Compound of Formula II 10 - 80 Detergent 0 ï 10 Dispersant 0. - 10 rm Lump retardant o - 10 Inert carriers to 100 Water suspensions and solutions contain the active ingredients suspended or dissolved in water or other suitable solvents together with surfactants, thickeners, antifreeze or preservatives.

Suitable surfactants can be selected from those indicated in connection with wettable powders. Any thickener used is usually selected from cellulosic materials and natural rubbers, while glycols are normally used when an antifreeze is required.

Preservatives can be selected from many materials, e.g. various antibacterial parabens, Phenol, o-chlorocresol, phenylmercury (II) nitrate and formaldehyde. Typical examples of aqueous suspensions within the scope of the invention are the following: 447 783 4 Water suspensions (sustainable) Weight percent Compound of Formula I 0.1 - 8 Compound of formula II 20 - 52 Detergent (s) Ü - 15 Thickeners 0 - 3 Antifreeze 0 - 20 Preservatives 0 - 1 Defoamer 0 - 0.5 Water to 100 The general examples given above indicate to the person skilled in the art what kind of concentrate composition was used according to the invention, and the following non-limiting examples further illustrate the preparations according to the invention. In this example, the compound of formula I is designated "CTDB", the compound of formula II (a) is designated "MBC".

Example 1 The following wettable powders are prepared:% by weight g CTDB 12.0 Mac 60.0 Sodium salt of condensed naphthalene sulfonic acids 5.0 y Sodium trideoyl sulphate 2.0 - Silica 5.0 Kaolin to 100.0 the excipients in conventional mixer equipment. The mixture was then further ground in a jet mill to a size of 1-10 microns, and finally the mixture was remixed and deaerated before being packaged.

Example 2 __, The following aqueous suspension was prepared: Weight percent CTDB 2.5 MBC 50.0 Sodium lauryl sulfate 3.0 Bentonite 3.0 Ethylene glycol - 5.0 Formaldehyde 0.2 Water to 100 f, 447 783 Both the active ingredients, reduced in size play in a conventional manner, if necessary, dispersed in water containing the detergent system, preservatives and part of the thickener. The particle size of both active substances was further reduced by liquid grinding, the residue of the thickener was added and allowed to hydrate, and the product was diluted with water to the desired volume.

The combination of the fungicides triadimephone (formula I) and carbendazim (formula II) was tested and found to have a synergistic effect.

Example 3 Aqueous sprays containing 10 and 20 ppm triadimefon and 200 ppm carbendazim were prepared. They were applied alone and in combination on wheat plants. When the plants dried after treatment, they were inoculated with uredospores from the root fungus Puccinia recondita and then placed in an incubator for 48 hours. After the incubation period, the plants were placed in greenhouses to allow disease symptoms to develop.

A value of disease prevention was calculated by comparison with untreated control plants.

Dose Percentage of disease ('ppm) inhibition Control - 0 (45) * triadimefon 10 19 19 carbendazim 200 37 triadimefon + carbendazim 10 + 200 59 + 200 67 * per cent.disease cases in the untreated control.

From the values obtained when each fungicide was used alone, it was possible to calculate the theoretical value of the disease prevention of the mixtures, by the well-known Colby equation (Weeds 15, pp. 20-20 (1967)) and synergistic effect was obtained by observing the values in the experiment was higher than the calculated theoretical values.

Claims (2)

10 15 20 25 447 783 'v PATENTKRAV Fungicidal preparation, characterized in that it contains as a fungicidally active ingredient a triazole compound of the formula _ \\ a Ãv / N 1: cl-Q o-cH-co-cuzn) Fungicidally active ingredient a benzimidazole 55-II together with at least one inert, non-phytotoxic carrier For these, the weight ratio of Compound I to Compound II being in the range of 5: 1 - 1: 3ÛU. Preparation according to Claim 1, characterized in that it contains 0.5 to 90% by weight of active ingredients and otherwise at least one inert, non-phytotoxic carrier for these.