How to tell if tobacco is harmful to drugs?

How do you know if tobacco is toxic? If the pesticide is used improperly and the technical requirements are not strictly controlled, it will not only fail to achieve the effects of insecticide, disease prevention, weeding and crop growth regulation, but also cause abnormal growth and development or physiological symptoms of tobacco, such as yellowing of leaves, serious leaf spots, wilting, burns, dwarfing, slow growth, deformity or even death of tobacco plants. Such symptoms are called phytotoxicity. According to the different symptoms, the crops affected by phytotoxicity can be divided into acute phytotoxicity, chronic phytotoxicity and residual phytotoxicity. (1)Acute phytotoxicity symptoms: acute phytotoxicity symptoms occur quickly, generally 2~5 days after application, and its symptoms are also obvious, such as burns, wilting, defoliation, leaf rolling, deformity, tender tissue withered, chlorosis or yellowing, dwarfing, etc. (2)Chronic phytotoxicity symptoms: after pesticide use, phytotoxicity does not appear immediately, symptoms are not obvious, mainly affecting the growth of tobacco and other physiological activities, most of which are manifested as weakened photosynthesis, slow growth and development, delayed fruit, small and deformed leaves, reduced yield or poor quality, color deterioration, etc. Chronic toxicity is identified by comparison with healthy tobacco. (3)Residual toxicity symptoms: caused by pesticides or their decomposition products remaining in the soil (in fact, it should also belong to chronic toxicity). This kind of phytotoxicity is mainly due to the long residual period of some pesticides, which affects the growth of crops, and the symptoms are not obvious in the short term. Click for more tobacco growing technology Click for more flower growing technology