The cause of the failure of pesticides and the solution:
Objective Causes Environmental factors such as temperature, humidity, rain, light, wind, and soil properties directly affect the physiological activities of pests and diseases and the performance of pesticides. The results will affect the efficacy of pesticides.
The chemical composition, physicochemical properties, the mechanism of action, the dose used, and the processing traits of the self-causing pesticides will directly or indirectly affect the efficacy.
How to deal with the failure of pesticides?
1, powder powder
If moisture accumulates in the custody process, it needs to be placed in a cool and ventilated place to dry and be used after being crushed. If agglomeration is serious, it can only be used as poisonous soil.
2, wettable powder
1 Take 1 part of wettable powder, add 200 parts of water, and put it in a glass. Shake well and wait for a certain period of time to observe the suspension. If the medicine precipitates slowly, it means that the suspension is good;
2 In case of poor quality, silicone additives or 0.1% neutral detergent powder should be added before use to increase the wetness. If the wettable powder binds to a hard block, it should not be used as a spray.
3, EC
1 Emulsifying properties of milk. Take 1 part of emulsifiable concentrate, add 200 parts of water and place it in a glass. Shake well and wait for about half an hour. Observe the emulsification. If there is no slick in the upper layer, there will be no precipitate in the lower layer and there will be no oil in the middle, indicating good emulsification performance. If there is emulsifiable concentrate on the surface, there will be sedimentation, and there will be stratification after 10 minutes, indicating that the emulsion cannot be used if it is destroyed; 2 agglomeration phenomenon. If the emulsifiable concentrate has been a non-flowable viscous liquid or has formed a soapy solid, it is proved that the solvent has been mostly volatilized and the quality has changed and cannot be used;
3 precipitation crystallization phenomenon. For long-term storage of the emulsion, white crystals or turbid substances may appear on the bottom of the bottle. If the cream bottle is immersed in warm water at 30°C to 40°C, the crystals can be dissolved in about 30 minutes to return to a clear liquid, indicating that the quality is good and can be used. If it does not dissolve, it indicates that the quality of the emulsifiable concentrate has changed and cannot be used.
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