SU550104A3 - Herbicidal composition - Google Patents

Description

(54) HERBICIDE STRUCTURE

This invention relates to chemical means for controlling weed vegetation, namely, to herbicidal compositions containing synergistic mixtures of organic substances. Herbicidal compositions based on two-component synergistic mixtures are known, for example, a composition containing about - (2, 4-dichlorophenoxy) propionic acid or its derivatives (salts, esters) and 3-alkyl-2,1-benzothiadiazinone dioxide 1. However herbicidal compositions are either not sufficiently effective against weeds, or are low-selective in relation to cultivated plants. The purpose of the invention is the effective suppression of the growth of resistant weed spreads and selective action with respect to cultivated plants. This is achieved by a herbicidal composition based on a two-component synergistic mixture containing ob - (2,4-dichlorophenoxy) propionic acid or its derivatives (salts or esters) and 3,6-dichloropyco-lipic acid or its derivatives (salts or esters). The proposed herbicidal composition contains 3,6-dichloropicolinic -acid or its derivatives and about - (2,4-dichlorophenoxy) propionic acid or its derivatives in a weight ratio of from 1: 6 to 1: 1OO, respectively, in terms of acid equivalents. This compound effectively inhibits the growth of such resistant weeds as chamomile, trichoptera and woodlouse. It is selective for wheat, barley, and some grassy cultivated plants. The form of application of the composition of the usual: solutions, pastes, emulsions, powders, suspensions, granules, etc. They are prepared in well-known ways. The content of active substances in these forms can vary considerably and range from 0.1 to 95% by weight (preferably 0.1 to 6O by weight,%). The formulation is compatible with other organic pesticides and fertilizers. 55 3 The synergistic effect of mixtures of o6- (2, 4, -dichlorophenoxy) propionic and 3,6-dichloric picolinic acids or their derivatives was calculated by the known method (Weeds 1967, 5O, pp. 20-22). Below are examples confirming the presence of synergism of the mixture and illkh; triaming herbidid action of the proposed composition. Example 1. Weed plant (wood lice) was grown in sandy-loamy soil under greenhouse conditions at a temperature of 18 ° C. Plants were grown in opposites (three plants each) to a stage of 48 leaves, then sprayed with the proposed herbicidal composition and individual components of the composition. 14 days after treatment, the herbicidal effect of the composition was determined in comparison with the action of the individual components. Rating scale: O - no effect 5 - full of plant death.

The degree of infestation of weed germs (in%) when using

  (5b- (2,4-dichlorophenoxy) propionic acid.

Table 2 4 of the experiment are presented in Table 1. Results Example 2. A plot of winter barley infected with trinity, was treated with aqueous solutions of ethanolamine salts of 3,6-dichloropicolinic and cC - (2,4-dichlorophenoxy) propionic acids. By this time, the weed had a stage of development of 612 leaves. The degree of damage to the weed was evaluated 12 weeks after treatment. Table 2 shows the observed degree of damage (O) and expected (E), the latter being calculated by a known method (Weedg, 1967, 50 pp. 20-22). From the table it can be seen that the synergistic effect is especially clearly observed when using relatively low doses of the mixture. Table 1

Claims (1)

1. Patent of Germany No. 1937551, cl. A 01 N 9/02, 1973