How to spray pesticides in high-temperature weather? Master these key points

In summer, when temperatures are high, pesticide spraying must be done safely. When spraying, it is best to wear cotton clothing and to put on a mask, gloves and other protective gear. When choosing and using pesticides, be sure to note the following: choose fast-acting pesticides, such as dichlorvos, fenpropathrin, procymidone, and phoxim-cypermethrin EC, which have strong insecticidal action and can kill pests within 1 to 2 hours after use.

Choose pesticides with strong systemic action, such as dimethoate, vamidothion, and metalaxyl. After 4 to 5 hours of use, more than 80% of the active ingredient can be absorbed into the internal tissues of the crop, so even if it rains, pests and pathogens can still be killed.

Add adhesives to water-based and wettable powder pesticides. Water-based and wettable powder pesticides have poor adhesion. When preparing pesticides, add 100 to 150 grams of soybean powder or laundry detergent as an adhesive per 100 kg of spray solution to improve the effect of the pesticide.

Avoid spraying pesticides on windy or rainy days or under the scorching sun. It is better to spray pesticides from 8 to 10 a.m. and after 5 p.m. When the wind is relatively strong, spraying should be stopped; otherwise, spraying will be uneven and pesticide damage is also likely to occur.

Determine the safe interval before spraying according to the toxicity of the pesticide. Generally, the residual effect period of highly toxic pesticides is more than 1 month, and the residual effect period of highly effective and low-toxicity pesticides is 7 to 10 days. Whether for grain, oilseed crops, melon crops, or fruit trees, pesticide use should be stopped according to regulations before harvest to prevent poisoning of humans and livestock. (Zhu Guangkai)