SU313330A1 - - Google Patents

Description

.:one

This invention relates to the use of dithiophosphate acid derivatives as fungicides. It is known to use O-alkyl-5-alkyl-5-benzyldithiophosphates as fungicides, however. these compounds are not sufficiently active as fungicides. The presence of one or two chlorine atoms on the alkyl of the alkoxy group as substituents significantly increases the fungicidal activity of compounds of the same type. . The object of the present invention is the use of O-chloroalkyl-5-alkyl-5-benzyldithiophosphate of the general formula as a fungicide.

P-S-CHg V

where R is methyl or ethyl; alkyl-C3-C4, substituted by one or two chlorine atoms. The most preferred compounds are those in. which R is 1-chloro-isopropyl (1), 1,3-dichloroisopropyl (2), 2-chloro-n-butyl (3) or 2-chloro-n-butyl (4).

These compounds can be prepared by the following reaction.

R o

 h

,) p-C1 MZ-SNg-

- NC

, -S-CH2 + MCl

RO /

where R and R are as defined above, and M is hydrogen or an alkali metal atom.

The form of application of compounds is common. Below are the compounds of the proposed general formula, the test results of which are given in the examples.

Example 1. 15 parts of a compound of 4.80 hours, a mixture of diatomaceous earth and koalin, and 5 hours of Runox (the trade name of an emulsifier from Toho Chemical Industrial Industries, Co., Ltd, Japan) are ground to powder and mixed to make a wettable powder. The mixture is consumed after dilution with water.

Example 2. 30 parts of the compound are 2.30 parts of xylene, 30 hours of Kawakazol (KawaKasol is a product of Kawazaki Kasei Kogyo Kabuyiki, Kaisha, Japan) and 10 hours of Sorpol (Sorpol is the trade name of the Toho Kagaku Kogyo pulverer from Kogyo Kabushiki, Japan) are mixed and stirred to form an emulsion. The mixture is applied after dilution with water.

Example 3. 2 parts of a compound of 1 and 98 parts of a mixture of talc and glia are mixed to obtain a powder that is used directly.

Example 4. 1.5 parts of a compound of 1.20 parts of 0, Odimethyl-0- (4-metlmercapto-3-methylfepnl) thiophosphate (lebaicide) and 96.5 parts of a mixture of ns talc and clay are mixed to make applied directly.

The effectiveness of the proposed compounds as fungicidal nreparatov explore, the results are listed below.

Use against pests ("Blast Helminthospormn leaf Sport rice plants (istapie in the pot):

a) Istatandrophylactic efficacy. Rice plants (a type of yucco) are grown in pots with a diameter of 12 cm. In the herd formation of sprouts, they are sprayed with a diluted solution of the active substance used in Example 2. The pots are mounted on a turntable, which moves in accordance with the dispenser supply. 50 ml per 3 pots with a pressure of 1.5 kgr / cm until the leaves are completely wetted with liquid.

For the next three days, the so treated pots are left to stand in a humid chamber at 25 ° C and at a relative humidity of 100%. At this time, a suspension of fungal spores (Blast) causing rice disease was sprayed twice by spraying.

After 7 days after inoculation, the size of the disease is determined by an assessment of the size of the scale from 0 to 5 and the control value of each compound against KBlast is determined by the following formula

b) Tests to determine the therapeutic effect. This test is carried out in order to determine the therapeutic effect of the compounds used, when the fungi have already been applied to the plants. The same rice plants, as in the above-mentioned preventive action study, are left to stand for 2 days in a humid chamber at 25 ° C and at a relative humidity of 100%. At this time, a slurry of grown fungus snores (Blast) causing the rice disease is applied by spraying. The next day, in the same way as in test a), rice plants grown in a pot are sprayed with a diluted solution with a certain concentration of compounds,

After 6 days after spraying, the size of the disease in each pot is determined in the same way and the control value is calculated. At the same time experiencing phytotoxicity against rice plants. The results are summarized in table. one.

Efficacy study against leaf sheath disease Sheath blignf rice plants (test in a pot). Rice plants (Kinnampu species) are grown in unglazed pots with a diameter of 12 cm. In the early stage of sprouting, they are sprayed with a diluted solution of the compound embedded in the previous application. On another day, sclerotia of the fungus causing the leaf sheath disease “Sheath blight”, infected with ten-day cultivation in the wheat culture medium, infect the roots of rice plants. They are held for 8 days in the inoculation chamber at 28-30 ° C and a relative humidity of 95% or more. The size of the disease is determined

The size of the lesion is determined for each compound according to the following formula:

, + 2 / gz + n-t + Opl, „.-. „

Steppes of the nurazhen - - - - x100%

Sr

e N is the number of all tests of plant trunks;

“O is the number of unaffected plant trunks;

n. - the number of trunks that have the disease up to the first leaf (from the ground);

“2 - NUMBER of plants affected before the second leaf;

Jaz - the number of plants affected by the disease up to the third leaf and above it.

Extent of Degree - Degree of Delay in Necessarily in the Processed Subject Area

Table

Note. The numbers of the compounds, such as in table 1.

The size of the disease is the average LH value of three pots.

Phytotoxicity: The (-) sign means that there is no effect on the growth of rice plants.

The results of the efficacy study against Sheath Blight in the sheet vagina of rice plants are given in Table. 2

The study of the fungi and plants with sprouts of various plants.

concentration on Wednesday agarop culture of potatoes. The mixture is poured into a Petri dish with a diameter of 9 m. C. and II seedlings are inoculated. Grown lasts 4 days at a temperature. After that, seedling growth is examined and determined using a scale from 0 (no disease) to 5 (the same growth as in the untreated area). results

Note. Compound numbers are the same as in table. one.

The degree of damage is the average of three pots. Urbatsid (methylarsin-bis-dimethyldithiocarbamate).

table 2

Table 3

910 i

Subject invention

The use of O-chloroalkyl-5-alkyl-5-benzo where R is methyl or ethyl; R is alkyl-Sat-C,

siltiethiophosphates of the general formula substituted by one or two chlorine atoms,

1 ov as a fungicide.

Tt S. ci

 -S-CH2- RO