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How to prevent phytotoxicity in greenhouse vegetables
Pesticides with different physicochemical properties have different physiological effects on vegetables. The effective concentration (or dose) required for control is different. Wherever the maximum tolerance of vegetables to pesticides is close to the effective concentration (or dose), if used improperly, often Can easily cause injury. Generally, plant pesticides are safer than organic synthetic pesticides. Organic synthetic pesticides are also safer than inorganic pesticides. Inorganic pesticides are used improperly, or the impact of climate is the most likely to cause injury. Seen from the type of pesticides, pesticides are safer than fungicides, and herbicides are prone to injury. Organophosphorus insecticides have high efficacy, low effective control concentrations, and relatively safe vegetables. Emulsions in process formulations are more likely to cause phytotoxicity than wettable powders and powders; milk powder and granules are safe for vegetables. Pesticide processing quality The processing quality of pesticides and auxiliary raw materials such as emulsifiers, wetting agents, and filling materials are unqualified, resulting in poor emulsifying properties of emulsifiers, low wettable powder suspension rates, and precipitation, all leading to the occurrence of phytotoxicity. The resistance of vegetables with different resistance to vegetables or different varieties of the same vegetable has the size of resistance. In general, there are many stomata or large stomata in the vegetables, and the leaves are thin. The vegetables with loose leaf tissue are weak in drug resistance, and they are prone to phytotoxicity. The waxy layer and cell wall of the leaves are thick and have more villous hair, and the drug resistance is stronger. Therefore, when applying pesticides, it is necessary to select suitable pharmaceutical agents for the morphological characteristics of vegetables to reduce or avoid the occurrence of phytotoxicity. Improper use of pesticides may also produce phytotoxicity. If the concentration is too high, the use of pesticides may be irrational. If the application is not uniform or if spraying is repeated, the resistance of the vegetable will be reduced and a phytotoxicity will result. Climate conditions Climate factors have the most obvious effects on temperature, humidity, and light. Generally, high temperature, dampness, heavy fog, drought, and strong winds cause wounds and can easily cause injury. The temperature is high, the effect of the drug is enhanced, the metabolism of vegetables is strong, and the resistance to drugs is weakened.