The performance and main factors of pesticides causing phytotoxicity to plants

Improper use of pesticides can have adverse effects on plant growth and development, or reduce crop quality, yield, or even no harvest. This is the phytotoxicity of pesticides on plants. The phytotoxicity can be divided into acute and chronic. Acute phytotoxicity occurs rapidly in a few hours or days after application. Such as anxiety, perforation, yellowing, discoloration or deformity, various rust spots, brown spots, color spots and other drug spots appear on the fruit; root dysplasia or formation of black roots, chicken claw roots; seeds are not germinated or seedling malformations, causing serious leaves , falling flowers, falling fruits, etc., even the whole plant died. Chronic phytotoxicity does not appear to be phytotoxic immediately after application, but plant growth and development are inhibited. After a long period of time, it shows slow growth, dwarf dysplasia, delayed flowering, increased flowering, low yield, poor quality. . In addition, the pesticides used in the former cockroaches are left in the soil and can cause phytotoxicity to the squat crops. There are many reasons for causing phytotoxicity, mainly due to the following three factors:
First, the physical and chemical properties of pharmaceutical agents have the greatest relationship with the phytotoxicity of plants. In general, inorganic pesticides with small water-soluble molecules are susceptible to phytotoxicity. Some oil agents can block the pores of crops and cause phytotoxicity; the quality of pesticides is poor, and it is easy to produce phytotoxicity after use; the pesticides are improperly mixed and produce phytotoxicity; the concentration of the agent is too high, which exceeds the ability of the plant to produce phytotoxicity; Spraying or continuous spraying, application and mixing of the mixture are not easy to produce phytotoxicity.
2. Plant factors The sensitivity of different crops, different varieties of the same crop, or different growth stages of the same variety to pesticides varies greatly. In the germination stage, seedling stage, flowering stage, booting stage and young leaves and young fruits of crops, it is easy to produce phytotoxicity.
Third, environmental factors High temperature enhances the activity of the agent and the metabolism of the plant, which is prone to phytotoxicity. It is easy to produce phytotoxicity when it is applied to soils with little organic matter or strong sandy soil. Seeds soaked in seeds or seed dressings are easily phytotoxic and slow down the germination rate in soaking soil.
Huaxian County Plant Protection Station Wu Limin
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