When spraying pesticides on cotton to control pests and diseases, it often affects the quality of spraying due to adverse weather, reduces the control effect, and even causes phytotoxicity. In response to this situation, the author has received better control effects according to different weather changes in the production practice.
In the windy day, the wind-blown cotton plant is not evenly treated, which affects the control effect. For this case, a variety of pesticides with strong systemic and penetrating power can be selected. When spraying, the nozzle should be closer to the cotton plant to prevent the mist from being blown away by the wind, and people should go to the wind to spray the medicine to prevent the liquid from being blown into the respiratory tract by the wind.
On rainy and cloudy days, when spraying and controlling pests and diseases on rainy days, the liquid is easily washed away by rain and affects the control effect. In this case, it is possible to use fast-acting pesticides with strong contact and fast knockdown. After rain or rain, properly increase the concentration of the liquid, reduce the amount of liquid, spray quickly and evenly on the cotton plants, and use cotton. The rainwater on the plant dilutes the pesticide, so that the cotton plant is evenly treated, thereby improving the control effect.
On high temperature days, especially at noon on hot sun, if you need to spray, do not use pesticides that are easily decomposed by light (phoxim) or highly toxic pesticides. Efficient, low-toxic, temperature-increasing pesticides can be used. When spraying, the concentration of the liquid should be appropriately reduced, and the amount of the liquid should be increased to prevent the water from evaporating too quickly in the hot sun, causing burns to the leaves and personnel poisoning.
There are many dewdrops on the open-air cotton leaves in the fog, and the liquid is easy to drip with the dewdrops. In view of this situation, the spraying can adopt a high-concentration and rapid ultra-low-volume spraying method, so that the liquid can be evenly transferred to the cotton plant to expose the drug, and energy saving and efficiency increase. At the same time, people must go to the limelight to prevent poisoning.
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