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1. The phytotoxicity of residual phytotoxicity is characterized by the fact that after the application, the seasonal crops do not cause phytotoxicity, and the medicinal agents remaining in the soil cause phytotoxicity to crops that are more sensitive to squatting. For example, after the use of simazine herbicides in corn fields, it often causes phytotoxicity to crops such as rapeseed and beans. This kind of phytotoxicity occurs in the germination stage of the seeds of the lower sorghum crops. The light roots, bud shoots and other parts become brown or rot, which affects the normal growth; the heavy ones rot and rot, reduce the emergence rate or not at all. This kind of phytotoxicity is more difficult to diagnose and is easily confused with fertilizers. It can be used to understand the cultivation and management of the former crops, the history of pesticide use, soil testing and other measures to prevent misdiagnosis.
2. Chronic phytotoxicity is a phytotoxicity. The symptoms are not immediately manifested after application, and have certain latency, which hinders crop growth and deteriorates fruit flavor. This phytotoxicity is often difficult to diagnose and is easily confused with other physiological diseases. At the time of diagnosis, diagnosis can be made by understanding the occurrence of pests and diseases, the type, quantity, area and plant control of the application.
3. Acute phytotoxicity This phytotoxicity has the characteristics of rapid occurrence and obvious symptoms. Generally, symptoms can appear within a few hours to a few days after application. Generally, the leaves appear spotted, perforated, anxious, curled, deformed, withered. , yellowing, chlorotic or whitening. The root damage is characterized by short and thick roots, rare root hairs, yellow or thick roots, brittleness, and rot. Seed damage is manifested as failure to germinate or slow germination. Plant damage is characterized by falling flowers, falling buds, fruit malformations, small, spotted, brown fruit, rust fruit, fruit drop and so on. This phytotoxicity is mostly caused by improper use of pesticides or pesticides for improper seed treatment.
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The wide application of pesticides, fungicides, herbicides and various plant hormones in production makes crop medicinal damage inevitable. Therefore, mastering the types and symptoms of crop phytotoxics and taking timely control measures is a safe use of pesticides. The problem. Crop phytotoxicity is generally divided into the following three types.
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