Improper use of pesticides will not only affect the effects of insecticidal and weeding, but also cause serious damage to crops. Therefore, it is necessary to grasp the correct use of pesticides. Understand what kind of symptoms your crop will be when it happens. For example, what are the symptoms of tobacco pesticide pesticide harm? (1) Acute injury symptoms: acute injury symptoms occur quickly, usually appear 2 to 5 days after application, the symptoms are also very obvious, manifested as burns, withering, defoliation, leaf rolling, deformity, tender The organization has coking, yellowing, yellowing or dwarfing. (2) Chronic phytotoxicity symptoms: After the pesticides are used, the phytotoxicity does not occur immediately and the symptoms are not obvious, mainly affecting the growth and other physiological activities of tobacco, and most of them are manifested as decreased photosynthesis, slow growth and development, delayed results, and small deformed leaves. , decrease in output or deterioration of quality, deterioration of color, etc. Identification of chronic phytotoxicity is generally compared with healthy tobacco. (3) Residual phytotoxicity symptoms: Caused by pesticides or their decomposition products that remain in the soil (in fact, it should also be chronic toxicity). This kind of phytotoxicity is mainly due to the long residue period of some pesticides, affecting the growth of crops, and the symptoms are not obvious in the short term. Dehydrated Tomato Flakes,Dehydrated Tomato Powder,Dehydrated Dried Vegetables Tomato,Healthy Pure Dehydrated Tomato Laiwu Manhing Vegetables Fruits Corporation , https://www.manhingfood.com
If improper use of pesticides, poor technical control, not only can not receive insecticide, disease prevention, weeding, regulating the effects of crop growth, but also cause abnormal growth and development of tobacco or physiological symptoms, such as the leaves turn yellow, serious Leaf spot, withering, burning, dwarfing, slow growth, malformation and even withering or death of tobacco plants. The occurrence of such symptoms is called phytotoxicity. The phytotoxic crops were divided into three categories: acute injury, chronic injury, and residual injury according to the symptoms.