Remedial measures for Drug damage of Cotton
First, elution. Most chemicals are not resistant to water scouring. If you find that the medicine is not used properly, you can immediately wash the stems and leaves repeatedly with a sprayer filled with water, so as to flush away the chemicals left on the surface of the cotton plant and reduce the drug damage; when flushing, the air pressure of the sprayer should be sufficient and the amount of water sprayed should be large. For the cotton fields with soil application and the drug damage caused by some herbicides, the soil can be irrigated immediately and the residual chemicals can be leached into the deep soil.
Second, fattening. In general, the degree of drug damage can be reduced by increasing fertilizer or foliar spraying of Lufeng 95, Gaomeishi, plant power 2003, Tianda 2116, etc., for the symptoms of leaf spots, leaf edge scorching, plant yellowing and so on. For example, when cotton seedlings are damaged by 2mai 4murD butyl ester, an appropriate amount of available nitrogen fertilizer can be applied to promote the growth and development of cotton plants and restore their normal growth and development as soon as possible.
Third, chemical control. The drug damage caused by some herbicides and plant growth regulators can be reversed by spraying plant growth regulators after the drug damage. For example, spraying 30~50ppm gibberellin solution on cotton seedlings can obviously promote the growth of cotton seedlings after being damaged by 2Jing 4murD, while spraying "920" solution or Jieshangling can alleviate the drug damage when cotton is damaged by dwarfin.
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Prevention and Rescue measures of three Major Drug damage to Cotton
1. Strict operation and effective prevention. When using all kinds of drugs mentioned above, cotton must be used rationally in accordance with the operation rules (including drug type, concentration, method and time, etc.), so that it can not only give full play to its efficacy, but also reduce the cost and prevent drug damage. 2. Timely "rescue" and eliminate "dangerous situation". After the occurrence of drug damage, a large amount of water can be sprayed on the leaves for leaching, and irrigation, drainage and washing medicine can be used in the soil, or safety agents can be used to neutralize and detoxify. If Bordeaux solution is misused, it can be sprayed with 0.5%-1% lime milk due to drug damage caused by copper ions.
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Beware of the three major drug hazards of cotton
Diagnosis and identification of insecticidal and fungicides. The damage degree of insecticides and fungicides is not only related to cotton variety, development stage and morphological characteristics, but also different from each other. For example, if dichlorvos is highly vaporized, cotton leaves can be smoked by spraying twice with 1000 times liquid; after being damaged by stone-sulfur mixture, the leaves and boll shells of cotton plants will produce burnt patches, and the leaves will soon dry off; stone-sulfur mixture is a strong alkaline agent, Bordeaux solution can only be used 7 ~ 10 days after use, if Bordeaux liquid is sprayed.
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