SU312436A1 - Fungicide - Google Patents

Description

The present invention relates to the use as fungicides of N-carbalkOXY-, N-carbalkenyloxy- and M-carbaryloxyproducts of benzoxazolinothions of the general formula </ BR> where X is .H, halo, R is alkyl, alkenyl, aryl. Unlike analog N-derivatives of benzoxazolinones, active only against wheat rust, these substituted benzoxazolinotones are characterized by a wide spectrum of fungicidal action and are not inferior in efficiency to the best industrial fungicides in relation to the suppression of cucumber mildew, potato phytophthyros, wheat rust, nature and the nature of potato mushrooms, phytophthyros, potato rust, wheat rust, vegetation, and potato mushrooms. Rio of rice and gray rot of grapes, as well as the spores of phytopathogenic fungi Alter naria soIani, Botritfs cinerea, Fusar oxysporum, Verticillium dahlia. due to a fungicidal effect. N-carbalkoxy (carbalkenyloxy, carbaryloxy) benzoxazolinethions are non-phytotoxic in effective concentrations, low-toxic for warm-blooded animals, for example, the most active drug N-carbethoxy-b-chlorobenzoxazshtion for whites, 3000 mg / kg The proposed compounds are prepared by reacting benzoxazolinone ions with chloroformate esters in the presence of hydrogen chloride acceptors. The reaction is carried out in an organic solvent medium, for example, in acetone, at 15-20 ° C. Example. Under greenhouse conditions, cucumber, potato, wheat, corn and rice plants are sprayed until completely wetted with suspensions of N-carbalkoxy, N-carbalkenyloxy or N-carbaryloxybenzoxazolinone in a concentration of 0.1%, with initial testing and a series of halving concentrations, starting from 0.2 to 0.00625%, when studying the most active. After 24 hours, the sprinkled cucumber plants are inoculated with a suspension of powdery mildew spores with a density of more than 50 thousand in 1 ml, and the potato plant is suspended in

conidium phytophthora with a density of about 50 thousand in 1 ml, wheat plants uredosporegli. stem rust mixed for better atomization with talc in a ratio of 1: 100, corn plants - a suspension of conidia gelmintosporioea more than 50 thousand per 1 ml rice riozg,

Infected plants are placed in a condition of 100% humidity for 20-24 hours for infection.

 The efficacy of the preparations according to the pressure to develop control is shown in Table 1.

Test of N-Carbethoxy-b-Chlorobenzoxy Aelenthione in Different Concentrations with Respect to Luminous Dew

cucumber shows that the drug activity is approaching the benchmark, for which mobestan is adopted (Table 2); in relation to potato phytophtoras, it is zinebous and surpasses zir 5 (Table 3).

Example 2. In order to study the duration of the fungicidal effect, cucumber was inoculated with powdery mildew on the 15th day after spraying of N-carbethoxy-b-chlorobenzoxazolinone at a concentration of 0.05%. The prevalence of asthenia cucumbers in the control is 100%; on treated plants, the disease does not develop.

The preparations are applied at a concentration of 0.1% by active ingredient.

Defecation of control; 100% development of the powdery mildew of cucumbers, 90% development (potato phytophtoras, 100% production of the gelmintosporioza of maize, 20 rare rust on average per sheet of wheat and 25-50 pennies of pyroscles per one rice plant.

Table 1

100% lesion of leaves with powdery mildew.

The development of phytophthora 87.5.

Example 3. The eradication effect of N-carbethoxy-b-chlorobeneoxazolinthion at a concentration of 0.1 and 0.05% is studied by spraying cucumbers infected with powdery mildew.

As the experiments show, the studied compound is not inferior in efficiency to seastan, suppressed the development of infection

table 2

That blitz 3

Example 4. To study

The spectrum of fungicidal action of N-substituted benzoxazolinone spores of phytopathogenic fungi is germinated in aqueous emulsions of substances of different concentrations.

The test results are shown in table 4.

Table 4

Example 5. In the Terbash vineyard of the Fedosii-Crimean region, N-carbethoxy-b-chloro-benzoxazolinone was tested at a concentration of 0.1% a.v. in the fight against gray mold caused by Botrytis cinerea. The compound was tested against greeofulvin taken at a concentration of 0.05%. The control was the raw bushes of grapes. The experiment was conducted on 20 bushes (5 times in four times). Between options

Lightning hazard

4312

Standard2 39 griseofulvin

Control331

Claims (1)

The smallest significant difference at Р 0.05 As follows from Table 5, N-carbethoxy-6-chloro-areoxazolin-ne35 is not as effective as griseofulvin and is a good fungicide against gray rot. Claims Application of benzoxazolinone derivatives of general formula Vineyard Spray-Havals% Bordeaux Liquid. The vineyard was cultivated in 4 terms: July 15, August 5 and 18 and September 1. Efficiencies were taken into account by counting the number of sick bunches and the extent of the lesion on a Pibal scale. The effectiveness of N-carbethoxy-b-chlorobenzoxazolinthion in the fight against the gray rot of grapes (the results of the survey of 09.25.1969 year) is presented in Table 5. Table 5 Disease development,% Total, affected, 1.49 1, 84 12.97 1.87. gd in e X - H, halogen; R is alkyl, alkenyl, aryl, as a fungicide.