Insecticides can only work if they enter the pests and reach the site of action. Therefore, a comprehensive understanding of the pest's own characteristics and living habits, in order to use the correct pesticides for pests in the process of chemical control.
Most insecticides enter the insect body through insect mouthparts and exert their insecticidal effects. According to the feeding characteristics of pests, insects can be classified according to the characteristics of the mouthparts.
Chewable mouthparts pest
Such pests must feed on plant leaves or other tissues when they are harming crops, causing damage such as leaf nicks, mainly lepidopteran larvae (such as leaf curlers, noctuid larvae, etc.), coleopteran pests (beetles), Orthoptera nymphs and adults (è—, 蟋蟀, è¼è›„), Hymenoptera larvae and adults.
Stomach-toxic insecticides have the most significant effects on the control of such pests, such as the most commonly used organophosphorus insecticides, some of the stomach-toxic carbamate insecticides, pyrethroid insecticides, and sand. Silkworm toxin insecticides, benzoylurea insecticides, some insect hormone insecticides, avermectin insecticides, etc.
Insecticides with good systemic properties but poor contact and stomach toxicity are usually ineffective against such pests.
2. Sucking mouthparts pests
These pests suck the young tissue of the plant through the mouthparts and suck the juice in the tissue, causing harm, mainly including aphids, spider mites, mites, adult mites, adult mosquitoes, and thrips.
For such pests, insecticides with good systemic or invasive properties and good stomach toxicity should be selected. Systemic insecticides mainly include organophosphorus insecticides, carbamate insecticides, silkworm toxin insecticides, imidacloprid insecticides, acetamiprid insecticides, and the like.
3. Underground pest control drugs
Underground pests mainly include alfalfa (chafer larvae), ground tigers, crickets, crickets, flower buds, and leaf mites. According to the characteristics of life, these pests may live in the soil or on the soil surface at a certain stage, and the damage site is special. The combination of pesticide and soil particles should be considered when applying the pesticide . Some pesticides lose their insecticidal effect when combined with soil. Therefore, the choice of pesticide ingredients is critical. It can be controlled by insecticide granules mixed with soil or sprayed with insecticide on the ground. Insecticides can also be used. Mix the bait to kill the insects.
4. For special pests
In melon crops, if the fruit fly pests have poor control effect, the traits of fruit flies on sweet and sour foods can be considered, and attractants can be made for prevention and treatment.
For the drill-bit pests, such as the beetles that are harmful to the stalks, the control method is mainly based on the injection of high-concentration liquid medicine, and the pesticide is selected to have an insecticide having a fumigating effect or a systemic action.
For the hibiscus moth, the winged moth, etc., which are responsible for the damage of the current year, it is necessary to control the spraying of the pest eggs during the incubation period. The medicament should preferably be an insecticide having good gastric toxicity, good contact toxicity (and good infiltration).
This year, there are many hot and rainy weather in the country, which is very likely to cause serious high incidence of pests and diseases , and will also affect the efficacy of pesticides, bringing great difficulties to prevent and cure diseases.
So how do you use pesticides in such weather? What should you pay attention to during the application? Let's talk about how to use insecticides when it is hot and rainy.
How to use insecticides when it is hot and rainy? Use insecticides when it is hot and rainy:
Improve pesticide utilization
When using pesticides for open-air crops, they should be selected to be resistant to rain. The ratio of emulsifiable concentrates is appropriate. These pesticides have a long residual time on the surface of the plants, while powders and liquids are relatively poor.
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: adding 50~75 grams of washing powder to each 50 kg of the liquid medicine, and evenly stirring and spraying 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. For ease of use, synergists can also be used as appropriate.
The weather is more varied this summer. Everyone should make timely preparations according to the weather conditions and use pesticides scientifically and rationally.
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