In spring and summer, the temperature is high and the rainfall is increasing. It is also a high season for a variety of plant diseases and insect pests. When the temperature is high, the volatility of the drug is enhanced, and it is easy to enter the body through the skin or respiratory tract, causing poisoning of the operator. When the pesticide is applied in rainy days, the agent will be affected by the rainwater scouring effect. Therefore, the application of chemical pesticides in the rainy season and summer should be done as follows:
It is necessary to avoid the rainy days and apply the medicine in the rainy days. The medicine is easily washed away by rain and reduce the efficacy. For example, if the emulsion pesticide is used, it should be protected from rain for at least 24 hours after application. The effect is good. Use stomach poison and contact type. Pesticides, no need to rain for at least 48 hours, can play a good role. Under the scorching sun, the plant metabolism is strong, the stomata of the leaves are open, and it is easy to cause phytotoxicity. At the same time, it is easy to volatilize the drug and reduce the control effect. If the temperature of the turf weeds is more than 35 °C when using butylamine, it is easy to cause phytotoxicity. It is safe to apply at around 25 °C. The best application time is 8 to 11 am and 4 to 6 pm.
To improve the application method, such as the selection of systemic insecticides, before the large-scale occurrence of pests, the fine soil is applied to the mud layer of the crop root zone to allow the plants to absorb, which can cause the pests to poison and die. This method of root zone application avoids rainwater rinsing and is especially suitable for use during the rainy season.
It is of this type to use quick-acting pesticides such as dichlorvos, monocrotophos, methamidophos, chlorpyrifos, enemy killings, insecticides, and chlorpyrifos in insecticides. These pesticides have a strong contact or killing effect, and the poisoning effect is rapid, and the pests can be killed by applying for 1 to 2 hours.
It is necessary to select the time to apply the medicine according to the activity rules of the pests. For example, for some pests that come out at night, such as rice leaf roller, the pesticide is selected in the evening to allow the drug to be absorbed by the plant, and the pests are taken out within 2 to 3 hours.
Use of systemic pesticides Systemic pesticides can enter the plant through the roots, stems, leaves and other parts of the crop, and transport to other parts, which can play a preventive role within a certain period of time. Such as carbofuran, omethoate, phosphorus amine and other insecticides and bactericides such as carbendazim, triadimefon, thiophanate, ruthenium, chlorophyllo, etc., 4 to 5 hours after the application of such pesticides, more than 80% The active ingredients are absorbed into the tissues by the crops and will not be washed away by rain and lose their efficacy.
Adhesives should be added. The adhesion between the aqueous agent and the wettable powder pesticide is poor. 100 to 150 grams of soy flour or neutral detergent powder is added as an adhesive per 100 kilograms of the solution. In addition, sugar, honey, soapy water, acacia, mineral oil and vegetable oil are also good adhesion agents. Appropriate addition of the above-mentioned adhesive can enhance the adhesion of pesticides on plants and pests, and reduce the scouring of chemicals by rain, thereby improving the use of pesticides.
It is necessary to avoid the rainy days and apply the medicine in the rainy days. The medicine is easily washed away by rain and reduce the efficacy. For example, if the emulsion pesticide is used, it should be protected from rain for at least 24 hours after application. The effect is good. Use stomach poison and contact type. Pesticides, no need to rain for at least 48 hours, can play a good role. Under the scorching sun, the plant metabolism is strong, the stomata of the leaves are open, and it is easy to cause phytotoxicity. At the same time, it is easy to volatilize the drug and reduce the control effect. If the temperature of the turf weeds is more than 35 °C when using butylamine, it is easy to cause phytotoxicity. It is safe to apply at around 25 °C. The best application time is 8 to 11 am and 4 to 6 pm.
To improve the application method, such as the selection of systemic insecticides, before the large-scale occurrence of pests, the fine soil is applied to the mud layer of the crop root zone to allow the plants to absorb, which can cause the pests to poison and die. This method of root zone application avoids rainwater rinsing and is especially suitable for use during the rainy season.
It is of this type to use quick-acting pesticides such as dichlorvos, monocrotophos, methamidophos, chlorpyrifos, enemy killings, insecticides, and chlorpyrifos in insecticides. These pesticides have a strong contact or killing effect, and the poisoning effect is rapid, and the pests can be killed by applying for 1 to 2 hours.
It is necessary to select the time to apply the medicine according to the activity rules of the pests. For example, for some pests that come out at night, such as rice leaf roller, the pesticide is selected in the evening to allow the drug to be absorbed by the plant, and the pests are taken out within 2 to 3 hours.
Use of systemic pesticides Systemic pesticides can enter the plant through the roots, stems, leaves and other parts of the crop, and transport to other parts, which can play a preventive role within a certain period of time. Such as carbofuran, omethoate, phosphorus amine and other insecticides and bactericides such as carbendazim, triadimefon, thiophanate, ruthenium, chlorophyllo, etc., 4 to 5 hours after the application of such pesticides, more than 80% The active ingredients are absorbed into the tissues by the crops and will not be washed away by rain and lose their efficacy.
Adhesives should be added. The adhesion between the aqueous agent and the wettable powder pesticide is poor. 100 to 150 grams of soy flour or neutral detergent powder is added as an adhesive per 100 kilograms of the solution. In addition, sugar, honey, soapy water, acacia, mineral oil and vegetable oil are also good adhesion agents. Appropriate addition of the above-mentioned adhesive can enhance the adhesion of pesticides on plants and pests, and reduce the scouring of chemicals by rain, thereby improving the use of pesticides.
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