SU1322967A3 - Method of fighting unwanted plants - Google Patents

Abstract

This invention relates to a method for controlling undesirable vegetation. It allows you to increase by 50-80% the efficiency of the method (as compared to the known endotap based) with respect to maize and chicken millet due to pre-emergence or post-emergence tillage with a compound of the general formula CH3 () where R is hydrogen, isopropyl; W is 2-methylphenyl, 2-fluorophenyl; n - O or 1, i with provided that if I, then W - 2-methylphenyl, R - hydrogen, in the amount of 1.12-10 kg / ha. 2 tab.

Description

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1 1 The invention relates to chemical plant protection products, namely, a method for controlling undesirable vegetation by treating the soil with an oxabicyclo apkan derivative.

The purpose of the invention is to increase the efficiency of the method.

Oxabicycloalkane derivatives are prepared; in the following way,

Compounds of general formula

where R is hydrogen, isopropyl;

Y is C (CH), where p O or 1. is reacted with a compound of the general formula WCHjL, where W is 2-methylphenyl or 2-fluorophenyl, and L is suitable from 20

The herbicidal effects of the tested compounds are assessed visually, 12 days after the spraying of the soil and written down from 0 to 9, the Evaluation means growth, as in the untreated test soil. Grade 9 means

a splinter group selected from atom 25 of the plant. Increase score

per unit on the linear scale approximately corresponds to a 10% increase in the level of action; The factually observed effect corresponding to each estimate is the following: EstimationValue

halogen, mesyloxy or tosyloxy groups.

The reaction is carried out in the presence of a strong base, for example, sodium hydride in an inert solvent.

The compounds listed in Table 2 are obtained. one.

I;

These compounds are tested using a set of plants: maize. Lea pshu (M); rice, Oryza sativa (R); chicken millet, Echinoclioa crusoalli (BG); oats, Avena Sativa (0); flax Linum usitatissisam (L); mustard, Sinapsis alba (M); sugar beet. Beta Vulgaris (SB) and Culture, Glycine max (S).

Trials are divided into two categories, pre-emergence and post-emergence. The pre-emergence testing involves spraying each formulation of the test compound onto the soil into which the seeds of these plant species are sown. The post-harvest test includes soil watering, where the soil in which the seedlings of the plants of these species grow, is impregnated with a liquid formulation containing the test compound, i.e. use prepared garden fertile soil.

Formulations were prepared from solutions of the tested compounds in acetone containing 0.4% by weight of an alkyl phenol condensate with ethylene oxide (trademark

five

0

TRITON x-155), Acetone solutions are diluted with water, and the resulting formulations are used with dosage standards corresponding to 5 kg and / or I kg of active material per 1 ha, in volume equivalent to 600 l / ha, during spray testing on soil and with dosage rates equivalent to 10 kg of active material per 1 ha, in volume equivalent of approximately 3000 l / ha, when tested with soil irrigation.

In the pre-emergence testing, the uncultivated sown soil and in the post-emergence testing the uncultivated soil containing seedlings is used as a control soil,

The herbicidal effects of the tested compounds are assessed visually, 12 days after the spraying of the soil and recorded on a scale from O to 9, the O score means growth, as in untreated test soil. Grade 9 means

5 plants. Increase score

0

five

0

five

per unit on a linear scale approximately corresponds to a 10% increase in the level of action; The factually observed effect corresponding to each estimate is the following: EstimationValue

9 No living tissue. 8 The plant is severely affected.

and his death is expected. 7 The plant is quite amazed.

but survival is expected 6 Moderate damage to the plant, but full recovery is expected 5 Intermediate damage

(probably unacceptable damage to cultivated plants)

3-4 Noticeable damage 1-2 Minor effects on the plant, possibly with chemicals, possibly due to biological variability

Claims (1)

O No noticeable effect. The test results are presented in Table 2, Formula Iso, Brethren A method for controlling undesirable vegetation by treating soil with an oxabicycloalkane derivative, characterized in that, in order to increase efficiency, a compound of general formula is used as an oxabicyclic alkaline derivative. 0 Qhi about -pOCHiW | lCH, -C-CHjln | 1322967 4 where R is hydrogen, isopropyl; W is 2-methylphenyl, 2-fluorophenyl; n O or 1, provided that n I, then W is 2-methylphenyl, 5R is hydrogen, in the amount of 1.12-10 kg / ha. Table 1 1iso-C, H7 2 3H ieo-C, H o 2-Methylfeiyl (") - exo 110-113 (0.1) 02-Fluorophenyl (+) -eco 105-112 (0.05) 12-Methylphenyl - 108-112 (O, I5)