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 produce 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. Diagnostic measures can be used to understand the management of previous crop cultivation, pesticide use, soil testing, to prevent misdiagnosis and losses.
In chronic injury: This injury after spraying the symptoms do not show up immediately, with a certain latent, blocked the growth of vegetables, fruit and other flavors worse. 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.
Acute phytotoxicity: This phytotoxicity has the characteristics of rapid occurrence and obvious symptoms. Generally, symptoms may appear within a few hours to a few days after application. Generally, the leaves of the vegetables are 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 deformity, 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.
Types of pesticides in vegetables and their control methods
The wide application of pesticides in vegetable production plays a very important role in the high efficiency of vegetable farmers, but the occurrence of phytotoxicity is not uncommon, which also brings unnecessary losses to vegetable farmers. Therefore, mastering the types and symptoms of vegetable phytotoxicity and taking timely preventive measures are issues that cannot be ignored in the safe use of pesticides. After consulting the relevant experts, the author summarizes the vegetable remedies into the following three types.
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