Pests are broadly known as insects, cockroaches, snails, rodents, etc. that are harmful to humans. Pests in the narrow sense generally refer to insects that cause harm to crop growth and development and agricultural production. Insects are the largest class in the animal kingdom, with more than 850,000 known species, accounting for 4/5 of the total number of animals. The body is divided into three parts: head, chest and abdomen, and the chest has 3 pairs of segmented feet, so it is also called hexapods. There are nine orders closely related to agricultural production: Orthoptera, Tauroptera, Homoptera, Hemiptera, Veined Wing, Lepidoptera, Coleoptera, Hymenoptera, and Diptera.
Orthoptera, the larger of the insect order, includes locusts, crickets, cockroaches, cockroaches, and other common insects. Large or medium-sized, chewable mouthpiece. The forewings are narrow and slightly hardened, and the hindwings are membranous; some species are short-winged, or even wingless, and some are extremely powerful and can fly over long distances. The hind feet are powerful and suitable for jumping.
Taemona , commonly known as thrips , has a tiny body. Most are yellowish brown or black. The compound eye is well developed, the antennae are long, and the file suction mouthpiece. The wing is membranous , with dense , long, tyrannical marginal hairs. Common rice thrips, smoky thrips, shallot thrips, westflower thrips and so on.
Homoptera, cicadas, leafhoppers, planthoppers, pyllids, whiteflies, aphids and mesozoans belong to this order. Mostly small insects, the stinging mouthparts, the base of which is born on the ventral surface of the head, as if from between the basal segments of the forefoot. Winged species have membranous front and back wings, and when stationary, they are roof ridge-like and cover the back of the body, many species of female insects are wingless, and there are often wingless types in mesenchymal worms and aphids, and leafhoppers and aphids can also transmit plant virus diseases.
Hemiptera, commonly known as "bugs" or "Tsubaki"; most of them are slightly flattened in width, the base of the forewings is leathery, and the end is half membranous, called half-elytra; the stinging mouthparts, whose nymphs have odor glands on their abdomen, are also called "bed bugs" and "fart bugs". Common pear net bugs, tea wing bugs, green blind bugs, three-point blind bugs and so on.
Bulbophyllum, often referred to as "cockroaches"; subheading, chewing mouthparts. It is a carnivorous beneficial insect that preys on aphids, butterfly moth larvae and so on. Commonly seen are large grasshoppers, lisops, toothfly and so on.
Lepidoptera , the second largest order of insects. The biggest feature is that the adult wings are covered with small scales, and the adults are called moths or butterflies. Siphon mouthpiece, forming a long, curlable beak. The difference between moths and butterflies is that the antennae of butterflies are expanded, while the antennae of moths are linear or pinnate; butterflies have their wings closed on their backs when resting, while moths rest with their wings flat on either side of the body or shrink into a roof ridge; butterflies are mostly active during the day, while moths are mostly nocturnal and usually have strong phototropism. Moth larvae usually spit silk as a cocoon when they enter the pupal stage; butterflies generally do not spit silk as a cocoon. Commonly seen are the Stinging Moth Family, Borer Moth Family, Nocturnal Moth Family, Pink Butterfly Family, Rhinocephalus, Tian Moth Family, Curly Moth Family and so on.
Coleoptera, the largest order of insects, has more than 300,000 species, accounting for 40% of the total number of insects. Commonly known as beetles, abbreviated as "beetles". The body is generally hard and shiny. The head is normal, but also extends forward into a beak-like (elephant carapace) with a chewing mouthpart at the end. The forewings are, hard, called elytra, with no obvious wing veins. Commonly seen are the family Percussidae, the Gidding family, the Family Apocynaceae, the Family Agaridae, the Family Apocynaceae, and the Family Pyropodidae.
Hymenoptera, including various ants and bees. Chewable mouthpiece with front and back wings connected by a fin hook. According to whether the base of the abdomen is shrunk and thinned, it is divided into broad-waisted suborders (leaf bee family) and slender waist suborders (Chickopterae, Cocoon Bee, Small Bee, Red-eyed Bee, etc.). Common wheat leaf bees, pear stem bees and so on.
Diptera, including mosquitoes, flies, flies, etc. Suction or licking mouthpiece. The forewings are membranous and the hindwings degenerate into balance rods. Commonly seen are wheat suckers, melon flies, leafminer flies, and ground maggots.