What are the symptoms of tobacco pesticide damage?

What are the symptoms of tobacco pesticide damage? Please introduce the symptoms of tobacco pesticide damage such as yellowing of leaves, severe leaf spots, wilting, burns, dwarfing, slow growth, deformities and even wilt or death of tobacco plants. The occurrence of such symptoms is called drug damage. According to the different symptoms, the crops damaged by drugs can be divided into three types: acute drug damage, chronic drug injury and residual drug injury. (1) Acute drug injury symptoms: acute drug injury symptoms occur very quickly, which usually appear 2-5 days after application, and the symptoms are also obvious. it is characterized by burn, withering, leaf falling, leaf curling, deformity, scorching of delicate tissue, chlorosis, yellowing or yellowing, dwarfing and so on. (2) symptoms of chronic drug damage: after the use of pesticides, the drug damage did not appear immediately, and the symptoms were not obvious, which mainly affected the growth and other physiological activities of tobacco. most of them are characterized by weakening of photosynthesis, slow growth and development, small and deformed leaves, reduced yield or poor quality, color deterioration and so on. The identification of chronic drug damage is generally compared with healthy tobacco. (3) symptoms of residual drug damage: caused by pesticides or their decomposition products residual in the soil (in fact, they should also belong to chronic toxicity). This kind of drug damage is mainly because the residue period of some pesticides is longer, which affects the growth of crops, and the symptoms are not obvious in the short term. Click to get more tobacco planting techniques click to get more flower planting techniques