What symptom can tobacco produce pesticide drug harm to have?
What symptom can tobacco produce pesticide drug harm to have? Improper use of pesticides will not only affect the effect of killing insects and weeds, but also seriously cause drug damage to crops. Therefore, it is necessary to master the correct method of using pesticides. Know what the symptoms of the crop will be when something critical happens. For example, what are the symptoms of pesticide damage in tobacco? If the pesticide is not used properly and the technical requirements are not strictly controlled, it not only can not get the effect of killing insect, preventing disease, weeding and regulating crop growth, but also cause abnormal growth and development or physiological symptoms of tobacco. 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
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How to prevent and cure tobacco black shank disease?
How to prevent and cure tobacco black shank disease? Methods the control strategy of tobacco black shank should be based on the use of disease-resistant varieties, strengthening cultivation management as the center, supplemented by chemical control. 1. Zhongyan 90, Xujin 1, K346, K394, NC82, NC89 and G.
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Seeking the planting method of tobacco covered with plastic film
Tobacco plastic film mulching planting method: soil preparation and ridging requires consistent ridge spacing, flat ridge surface, fine broken soil and no stubble. The distance between ridges is 100cm, the distance between plants is 50cm, and there are 20000 seedlings per hectare. Timely early planting plastic film tobacco should be planted early, effective use of accumulated temperature, generally 5.
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