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The phytotoxicity of acetochlor in the cotton seedling stage, the cotton seed is weeded by acetochlor before sowing, which is highly susceptible to phytotoxicity, especially in the case of continuous rainy weather, high temperature and high humidity in the shed, which is beneficial to acetochlor. Decomposition, so that the concentration of the lower part of the cotton bud sheath is high, the phytotoxicity is heavier, and even the cotton seedlings in the seedbed may all die. The symptoms are that the whole young stem has a yellow-brown epidermis, and some petiole stalks also appear yellow-brown. When the phytotoxicity is light, the internal vascular bundle is green, and the phytotoxicity gradually recovers after the remedy is relieved. When the phytotoxicity is heavier, the vascular bundle is invaded. Cotton seedlings withered. Therefore, it is best not to use acetochlor when growing cotton seedlings. If acetochlor has been used, it should also be dried in bed after the cotton seedlings are unearthed, and the bed soil will be whitened. After the occurrence of phytotoxicity, on the basis of the drying bed, proper heat preservation promotes the growth of true leaves and improves the resistance of cotton seedlings. In the growth period after transplanting cotton seedlings, some places use acetochlor and grass to remove grass, and cotton leaves appear to be scorched. This is because acetochlor can inhibit plant cell division; if the damage is light, at 10 Do not die within a day, by strengthening fertilizer management, to promote plant growth, there is little impact on cotton yield, therefore, do not spray acetochlor onto cotton leaves, can only be used for soil closure of cotton fields.
2.4-D-butyl acrylate When the herbicide is used in reed fields and other farmland, large-area cotton damage often occurs due to drift. The main symptoms of the damaged cotton are that the upper young leaves become chicken claws, the leaves and leaves are shrunk, the leaves turn green, the leaves are open, the cotton buds turn yellow, and the above symptoms are severe in 7-8 leaves. There are 3~4 leaves, and 1~2 leaves are lighter. 2.4-D-butyl ester has strong systemic conductivity. It can cause phytotoxicity to young leaves and axillary buds of cotton and other dicots. , it is irreversible. Generally, cotton can be damaged to varying degrees within 2,500 meters in the downwind direction. Also note that the device for dispensing and spraying 2.4-butyl butyl ester should be used exclusively, and should not be contacted or accidentally sprayed on the leaves of cotton plants.
Methyltetrachloride A sprayer that is accidentally sprayed or sprayed with a solution of dimethyltetrachloride can easily cause phytotoxicity if it is not thoroughly cleaned and sprayed to the cotton field. The symptom is that the cotton leaves turn white and cannot be used for photosynthesis. If the effective measures are not taken in time, the entire damaged cotton field is in danger of being scrapped. In this case, the damaged cotton can be detoxified by spraying sodium humate solution. The granular 50% humic acid sodium is first dissolved in a small amount of water, and then water is added to form a 3000-fold solution foliar spray.
In addition, if diuron is used after the two true leaves of cotton, it will cause the phytotoxicity rate to be more than 90%; the net stalk will make the cotton leaves fade, chlorosis and wither; the production is often used. 2.4-D sprayer is not washed and used in cotton field spraying, it will immediately show phytotoxicity, the leaves appear smaller, narrower, veins twisted, shrinkage, deformity, often chicken claw-like leaves.
Don't neglect cotton pesticides
In recent years, the author found in rural surveys that the use of chemical pesticides to cause phytotoxicity to cotton has occurred frequently, some in the seedbed, and some in the field, seriously affecting the growth of cotton, the affected farmers regret it, suffering, can not be said, should Arouse attention.
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