The use of insecticides can only exert its insecticidal effect after it enters the body of the pest and reaches the action site of the insecticide. The selection of pesticides needs to be "appropriate for the insects", so a comprehensive understanding of the characteristics and living habits of the pests, and mastering the knowledge of the use of pesticides, can only use the correct pesticides for the pests in the process of chemical control.

1. Select pesticides according to the characteristics of pest mouthparts

Nine orders of insects in agricultural production are the main agricultural pests, they are Coleoptera (beetles), Lepidoptera (moths and butterflies), Orthoptera (locusts, crickets, mole crickets), Hymenoptera (saw bees) , Stem wasps), Isoptera (termites), Thysoptera (thrips), Diptera (flies and mosquitoes), Hemiptera (bugs), Homoptera (cicadas, lice, scales, aphids) ). However, most insecticides can enter the body of the insect through the insect mouthparts, and then reach the target of the nervous system to exert its insecticidal effect. Therefore, understanding the mouthparts of pests is crucial to our selection of pesticide formulations to ensure insecticidal efficacy. According to the feeding characteristics of pests, they can be classified according to the characteristics of mouthparts.


1. Chewing pests: When these pests damage crops, they must feed on plant leaves or other tissues, causing damage to leaves such as nicks. The main pests are Lepidoptera larvae (such as leaf rollers, noctuid larvae, citrus swallowtail, etc.), Coleoptera pests (beetles), Orthoptera nymphs and adults (locusts, crickets, mole crickets), membranes Pteran larvae and adults, insecticides with strong stomach toxicity have the most significant control effects on these pests, and insecticides with good systemic properties but poor contact and stomach toxicity are ineffective against these pests. To control these pests, pesticides with good stomach toxicity can be selected. Such as the most commonly used organophosphorus insecticides, some carbamate insecticides with stomach toxicity, pyrethroid insecticides, nematoxin insecticides, benzoyl urea insecticides, Some insect hormone insecticides, abamectin insecticides.


2. Suction-sucking pests: These pests need to suck the tender tissues of plants through insect mouthparts, and the main pests that suck the sap from the tissues are aphids, leafhoppers, stink bugs, scale insect nymphs, and mosquito adults. , thrips, etc. These pests should choose insecticides with good systemic or intraosmotic properties and good stomach toxicity. Such insecticides include: organophosphorus insecticides, carbamate insecticides, necrotoxin insecticides, and nicotinic insecticides.