For the phytotoxicity of crops, due to factors such as disease factors, lack of fertilizer factors and crop physiological obstacles, the difficulty of identification is increased. After encountering phytotoxicity, if the crop grows abnormally, the following points should be noted in the diagnosis: First, whether the abnormal symptoms of the crop occurred in the late stage of application, should verify the variety, period of use, dosage and usage of the pesticide used. correct. Second, investigate whether abnormal symptoms are different from the same crop field to exclude non-phytotoxic factors. Third, familiar with the symptoms and occurrence of crop diseases, phytotoxicity and nutritional deficiencies, and pay attention to the difference. Fourth, the biological culture method and the anatomical method are used to check the abnormal symptom parts of the crop, and the changes of the crop tissue cells in the presence or absence of the pathogenic bacteria. This is a more accurate diagnosis.
Huaxian County Station
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