How to "confirm diagnosis" of crop phytotoxicity
The wide application of pesticides, fungicides, herbicides and various plant hormones in production makes it difficult for crops to occur. Therefore, it is safe to use pesticides to master the types and symptoms of crop phytotoxics and take timely control measures. A problem that cannot be ignored. Crop phytotoxicity is generally divided into the following three types.
1. Residual phytotoxicity This phytotoxicity is characterized by the fact that after the application, the seasonal crops do not cause phytotoxicity, and the pesticides remaining in the soil cause phytotoxicity to crops that are more sensitive to squatting. As the use of corn field herbicide simazine, they tend to produce on the Following injury canola, beans and other crops. This injury in multi-stage Xiacha crop seed germination occurs, the light tips, shoot buds and other parts or brown rot, affecting the normal growth; severe bad species bud rot, seedling emergence or completely reduced emergence. This injury is difficult to diagnose, easy and fertilizer damage and so confused. 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. The phytotoxicity of chronic phytotoxicity, the symptoms are not immediately manifested after application, have a certain latent property, hinder the growth of crops, and deteriorate the flavor of the fruit. 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, yellowed, chlorotic or whitened. 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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