Spraying pesticides should consider meteorological factors
Temperature within a certain temperature range, the higher temperature will enhance the penetration of drugs, speed up the rate of poisoning, and help improve drug efficacy. However, after the temperature exceeds a certain range, the efficacy will decrease. In general, when the temperature is within the range of 20°C to 30°C, the effect is better than when the temperature is below 20°C. However, when the temperature exceeds 35°C, the high temperature will promote the decomposition of the drug and reduce the durability of the drug efficacy. At the same time, the sprayed droplets of water will also volatilize easily, which will increase the concentration of the local liquid and increase the metabolism of the crop. Crop phytotoxicity occurs, and it is easy to cause personal poisoning accidents. Therefore, when spraying on sunny days, it is best to choose to do it before 11 o'clock in the morning and after 4 o'clock in the afternoon. Avoid spraying at high temperatures in the noon.
Humidity Hunan Province is the rainy season from April to June. Due to the high rainfall and high air humidity, it has a certain impact on the efficacy of the drug. For most emulsion pesticides, due to high humidity, their use concentration will be relatively reduced, and the loss of liquid medicine will be increased, thereby reducing the efficacy. However, for some pesticide powdered pesticides, it is beneficial to the adhesion of powders to the stems and leaves of crops, which can improve the efficacy of pesticides.
When pesticides are sprayed on rainy days, pesticides can easily be washed away by rain, resulting in reduced or even ineffective drug efficacy. The rainy season in Hunan is long and the weather changes frequently. Sometimes it is difficult to choose good weather. However, if the pest control period has arrived and the spraying time cannot be excessively extended, the following measures can be taken to improve the control effect. . First, add appropriate amounts of adhesives and auxiliary agents, such as washing powder, tapioca slurry, etc., to increase the adhesion of pesticides. The second is the use of strong absorption of pesticides, such as dimethoate, insecticide double, rice bran net, etc., if no rain within 4 hours after application, there are more than 80% of the pesticide active ingredient is absorbed by the crop, after 4 hours When it rains, it has little effect on drug efficacy. The third is the selection of quick-acting pesticides (such as fast-killing), which will produce efficacy within a short time after spraying. The fourth is to choose powder pesticides, especially in the case of heavy fog and dew, spraying powder pesticides is the most favorable. In particular, wettable powders can dissolve in dew and speed up poisoning. The fifth is to choose ultra-low-volume sprayer to spray medicine, because of its high concentration of liquid, fine droplets, easy to be absorbed by crops, can reduce the loss.
Wind and wind can promote the volatilization and loss of chemicals, resulting in the waste of medicines. At the same time, it can easily lead to liquid drift and increase air pollution, and can easily lead to personal pesticide poisoning accidents. According to experiments, applying powder pesticides in the case of three or four winds can cause about 1/4 of the drug losses. Therefore, it is not suitable for spraying during strong winds, and it is better to apply under calm wind or breeze conditions. The smaller the general wind power in the morning or evening of the day, is the better time for spraying. At the same time, pesticides should also be sprayed in the wind direction. Operators should use the wind or the wind to make windfall. In this way, the pesticide can be sprayed accurately and safely.
The light intensity and the drug killing effect have a certain relationship. The first is that strong light can speed up the volatilization and decomposition of the drug and shorten the drug efficacy period. For example, organophosphorus pesticides can easily decompose and fail in the presence of light, which is the reason that the emulsion pesticides are mostly used in the dark brown bottle, and it is also the reason to use cloudy or sunny evening dosing. The second is that under strong light, the metabolism of the crop is vigorous, the stomata is open, and pesticides are liable to produce phytotoxicity to the crop. The third is a lot of nocturnal pests, which are in inhospitable conditions during the day and start to feed at dusk. For example, the tiger larvae hid in the soil after sunrise and came out of the crops after sunset. There were rice borers and leafhopper larvae hiding in the heart and infestations when they were exposed to high temperatures during the sunny day. They were harmful at night or on cloudy days. crop. In summary, in the summer and autumn seasons, when cloudy days or sunny evenings are selected, even pesticide spraying by moonlight is not only suitable for light, but also has small wind power, suitable temperature and humidity, and pests are mostly in the state of feeding and receiving pesticides. , It can be said that it is made in 100, medicine to insects.
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