The recent rainy weather has caused serious and high incidence of pests and diseases , which has brought great inconvenience to disease prevention and treatment. So rainy weather, what kind of pesticide is most suitable? When is the best spraying time? Do you want to change the concentration? Add no adjuvant? The following four points of medication precautions you may wish to look at.
Adding auxiliary synergist
When using pesticides for open-air crops, they should be selected to be resistant to rain, and emulsifiable concentrates are suitable. These pesticides have a long residual time on the surface of the plants, while powders and liquids are relatively poor. For many crop types, there are fluff or thick waxy layers on the surface of the leaves, such as corn, green onions, ginger, taro, etc. The liquid is easy to form droplets on the villi and waxy layers, and cannot fully contact the surface of the leaves of the plants. The adhesion substances such as washing powder and tea leaching solution can be added to the pesticide , which can enhance the adhesion of the pesticide on crops and pests, thereby improving the control effect. The method is as follows: 50 to 75 grams of Detergent powder is added to each 50 kg of the liquid medicine, and the mixture is evenly sprayed and sprayed in time. Note that it is best to use it now, not for a long time. Washing powder and tea leaching solution are generally not suitable for mixing with acidic pesticides.
Choose the right pharmacy
Fast-acting pesticides such as insecticides net Baly, fenitrothion, Decis, Kuaishaling, deltamethrin pesticide, a strong contact and fumigation, 1 to 2 or 4 hours after administration After ~5 hours, the pests can be killed.
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 will work in a short period of time. For example, powder rust, powder rust, mad killing and other bactericidal insecticides, 80 to 4 hours after application, 80% of the active ingredients are absorbed into the tissue by the crop, less loss of medicinal properties due to rain leaching.
Microbial pesticides such as BT-781, Penicillium, Beauveria bassiana, which are commonly used for microbial active pesticides, are more favorable for the germination and reproduction of sporophytes under high humidity conditions. The application of such pesticides on rainy days can fully exert their pest control effects.
The hygienic pesticides and fungicides have good rain resistance, such as Jinggangmycin, Zhiweiwei and Suikeling. Even after showering for 1 to 5 hours, they will not be washed and affect the efficacy.
Reduce the concentration of the agent
The efficacy of most pesticides will increase with the increase of temperature. Therefore, attention should be paid to reducing the dosage of the liquid when using the medicine. Especially the hormonal medicines are especially noticeable, and the heavy dose can easily lead to the occurrence of phytotoxicity. Therefore, it is necessary to adjust the concentration of the drug according to the change in temperature.
Pay attention to spray quality
When the spraying of the medicament is carried out, the pesticide droplets adhering to the surface of the crop blade are limited. When the spraying amount exceeds a certain limit, the fine droplets on the blade will condense into large droplets, roll off and lose, and instead make the blade The amount of pesticide attached to it is reduced. The spray method generally requires uniform distribution of the spray droplets and high coverage, so that it is not necessary to drip the surface of the wetted plant, so that the sprayer used is required to have a good atomization effect and reduce the waste of the liquid.
Prevent liquid poisoning
Dispensing and applying drugs should prevent pesticides from corroding the skin. When using volatile pesticides, be sure to wear masks. Do not spray pesticides at high temperature. Spray should be taken before 9:00 am or after 4 pm to avoid the occurrence of phytotoxicity. Do not apply too long for continuous application.
More pesticide knowledge , please pay attention to China Pesticide Network
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