Herbicide phytotoxicity diagnosis and remedial measures

Herbicides can effectively and rapidly control farmland weeds. In recent years, the application amount and application area have been continuously expanded, and the effect has been remarkable. However, when it is used, it often causes various phytotoxicity to crops due to improper application, resulting in serious losses.

First, the symptoms of herbicides The symptoms of herbicides caused by pesticides have variability and diversity. Generally, the symptoms of pesticides are faster than those of diseases, and no pathogens appear. The main symptoms are: bending, twisting, curling of stems and leaves, shortening of internodes, thickening of leaves, chlorosis, bleaching, blemishes, and malformations. For example, if the pomegranate is harmed, the tender leaves of the cotton will fade, lose its green color and wither. After being harmed by trifluralin, it can cause the true leaves of the 2nd and 3rd plants of the cotton plant to shrink and become smaller, and the serious injury will cause the green color of the cotyledon of the cotton, thickening and brittleness, thickening of the stem base, and shortening of the plant. , It may even cause growth point necrosis and lateral branching. In addition, cotton is extremely sensitive to 2,4-D, and the damaged cotton plants show that the leaves become smaller, narrower, and the pedicles are distorted, shrunken and deformed, often showing chicken claws.

Second, remedial measures to remove the damaged foliage. The cotton fields affected by herbicides such as 2,4-D butyl ester and dimethyl tetrachlorine should be used to destroy the deformed leaves and branches in time; the top victims are heavier, they can hit the top and use the lower 2-5 leaf branches to achieve certain results. Yield. Spray growth regulators. The cotton fields affected by herbicides such as 2,4-D butyl ester and dimethyl tetrachlorine can be sprayed with 1-2 times of 20 mg/kg gibberellin solution according to the degree of cotton damage, so as to ease the phytotoxicity and promote cotton growth. Strengthen fertilizer and water management. Damaged cotton field should be promptly filled with water to reduce the concentration of herbicide in the body, combined with irrigation, increase the application of urea 5-7.5kg/mu. Foliar spray fertilizer. Damaged cotton fields, sprayed with 1%-2% urea solution, or 0.3% potassium dihydrogen phosphate solution 30-50kg/mu, have a significant role in relieving phytotoxicity and promoting cotton growth.

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