The recent rainy weather has caused serious diseases, insects, and weeds, which has caused great inconvenience to disease prevention and pest control. What is the most appropriate pesticide for rainy weather? When is the best time for spraying? Do you want to change the concentration? Plus no adjuvant? The following four points of medication precautions you may wish to take a look.
Adding booster
When pesticides are used in open-air crops, rainwater washout should be selected. Emulsifiable concentrates, etc. are suitable. These pesticides have a long residual time on the plant surface, while powders, water agents, etc. are relatively poor. In many crop types, there are villi or thick waxy layers on the surface of the leaves, such as corn, scallion, ginger, taro, and the like, and the liquid liquid is easy to form droplets on the villi and waxy layer, and cannot fully contact the surface of the plant leaf. Can add detergent, tea dry leaching liquid adhesion substances such as adding pesticides, can enhance the pesticide in the crops and insect pests on the body adhesion, thereby enhancing the control effect. The method is: add 50-75 grams of detergent for every 50 kilograms of liquid medicine, and apply it after stirring evenly. Note that it is best to use it now. Washing powder, tea dry leachate generally should not be mixed with acidic pesticides.
Choose the right medicine
Fast-acting pesticides such as insecticides such as leafhopper net, safrole pineicide, adversarial killer, fast killing spirit, deltamethrin, etc., have a strong contact and fumigation effect, 1 to 2 hours or 4 hours after application. The pests can be killed after 5 hours.
Systemic Pesticides Systemic pesticides can enter the plant body through the roots, stems, and leaves of crops, and are transported to other sites and function within a short period of time. Such as rust azole, triadimefon, mad kill and other fungicides, 4 to 5 hours after application, 80% of the active ingredients were absorbed into the organization by the crop, and less due to rain leaching and loss of medicinal properties.
Microbial active pesticides such as BT-781, Helicobacter, Beauveria bassiana and other microbial pesticides are more conducive to the germination and reproduction of their sporophytes under high humidity conditions. The use of such pesticides in cloudy and rainy days can give full play to their insecticidal effects.
Rigid-bearing pesticide bactericides such as Jinggangmycin and chlorfenone, sulfacin have good resistance to rain, even if they encounter showers after 1 to 5 hours of application, they will not be swept and affect the efficacy.
Reduce agent concentration
The efficacy of most pesticides will increase with the increase of temperature, and the efficacy will also be enhanced. Therefore, the amount of liquid medicine should be reduced when using medicines. Especially the hormone-type medicines are particularly noticeable. The weight of medicines can easily lead to the occurrence of phytotoxicity. Therefore, it is necessary to reasonably adjust the concentration of the drug according to the temperature change.
Pay attention to spray quality
When pesticide spraying, there are limits to the amount of pesticide droplets that can be attached to the surface of the crop leaves. When the spraying volume exceeds a certain limit, the fine droplets on the blades will condense into large droplets, which will roll and fall. The amount of pesticide attached to it decreased. The spray method generally requires that the quality of the spray mist is evenly distributed and the coverage is high. It is advisable that the surface of the wet plant does not drip. This requires the sprayer to have a good atomization effect and reduce the waste of the liquid.
Prevent liquid poisoning
Pharmaceuticals and pesticides should be used to prevent pesticides from corroding the skin. We must pay attention to wearing masks when using volatile pesticides, and prohibit spraying pesticides at high temperatures. Spraying should be performed before 9 o'clock in the morning or after 4 o'clock in the afternoon to avoid phytotoxicity. Do not apply drugs for extended periods of time.
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