1. The suitable temperature for temperature pesticide spraying is 20 ° C to 30 ° C. If the temperature is too low, it is not conducive to the full effect of the drug; if the temperature is too high, the droplets will evaporate rapidly, and the decomposition of the drug will be faster, which will reduce the control effect. When the temperature exceeds 35 °C, the horticultural crops have strong metabolism and the stomata are wide open. At this time, such as sulfur application, oil soap and herbicide, it is easy to enter the crop to cause phytotoxicity, and it is also likely to cause personal poisoning accidents. Therefore, it is best to apply before 11am and after 4pm.
2. Humidity and humidity will generally reduce the efficacy, but it is conducive to the adhesion of powder and crop stems and leaves, significantly improve the efficacy. However, if the dew is too heavy, the agent is easily lost on the leaf surface with the dew, resulting in waste. Generally, the damp soil can better absorb the insecticide, increase the chance of contact between the agent and the pest, and can improve the control effect.
3. Precipitation and rainwater scouring will cause loss of chemicals. Therefore, pesticide application should be carried out on sunny days, and it is best not to rain for one or two days after spraying. When the rainy season is not applicable, the adhesive and auxiliary agent may be added to the medicament, and the systemic strong pesticide and the quick-acting pesticide are selected to kill the pest in a short time, and the ultra low-volume sprayer can also be used. The medicine has a high concentration and a fine mist droplet, which is easy to be stuck by the crop and reduces the loss.
4. Light pesticides are easily decomposed under light. For example, phoxim can be photolyzed in 3 days under illumination; the fungicide diclosan and the herbicide trifluralin cannot be applied under light conditions. In addition, under strong light, the plant metabolism is strong, the pores are open, and pesticides are susceptible to phytotoxicity to crops, so it is not suitable for application at hot noon. The pests that lie in the night, such as the ground tigers, only come out at night, so it is advisable to choose a cloudy or evening application to achieve good control effects.
5. When the wind adopts the methods of spraying, dusting and fumigation, the horizontal movement of the wind will cause the loss or uneven distribution of the medicament, so the weather spray with no wind or small wind should be selected. When spraying, people should stand on the wind to prevent poisoning accidents, and pay attention to the situation of the downwind to prevent the drugs from harming other horticultural crops.
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