In the production of cotton, the use of herbicides and plant growth regulators is a common measure, but due to improper use or arbitrarily increased dosage, there is often a large area of ​​phytotoxicity, so it should be noted.
Herbicide poisoning and symptoms: Including growth inhibited, stems and leaves twisted, internode shortening, blade thickening, chlorosis, bleaching, spotting, malformation and so on. If trifluralin and acetochlor are used for weeding and weeding, cotton will be victimized if it is accidentally worn. Praxanthine will cause the cotton leaves to fade and wither. Paraquat leaves can be discolored 2 to 3 hours after treatment. Cotton is very sensitive to 2,4-D butyl ester, and the affected leaves become smaller and narrower, showing a "chicken-claw shape". When the damage is severe, the fruit branches do not protrude normally.
Plant growth regulator injury and symptoms: If the commonly used chlormequat application concentration is too large, the amount of medication is too much, it will inhibit the growth of cotton plants, so that the cotton plant is too short, Lei Ling easily fall off, and even cotton bolls become deformed. When overdose of amines is sprayed excessively, its growth is inhibited, and the appearance of dark green leaves, thickened leaves, malformation, shrinkage, short intersegmental stems and other phenomena occur.
Control measures: 1. Strict operation. The use of drugs should be selected in strict accordance with the operating procedures, and repeatedly see the instructions on the use of concentration, methods and time, etc., to prevent the use of improper phytotoxicity. 2. Clean in time. After the occurrence of the phytotoxicity, a large amount of fresh water can be used to wash the leaves, and the soil can be filled with water and washed with water. 3. Neutralization and detoxification with safeners, can spray 0.5% ~ 1% of milk and neutralize detoxification. Because "920" has the function of promoting the growth, division and differentiation of plant cells, when the damage of chlormechanic acid and chitosan is caused in cotton, a certain concentration of "920" can be sprayed to relieve the phytotoxicity. When paraquat is in the soil, it is inactivated by passivation. The method of pouring muddy water immediately after accidental spraying can make the medicine on the surface of the crop fail. 4. Spraying equipment for cotton fields should be used exclusively. Sprayers and cups that spray 2,4-D butyl ester and dimethyl tetrachlorine should not be used. Other pesticides must be sprayed thoroughly after cleaning. 5. Strengthen protection, use the herbicide to spray between the rows of cotton, choose windless weather, spray head should be equipped with a protective cover, when spraying spray nozzles, try not to spray the liquid onto the cotton.
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