There are many types of underground pests, mainly including more than 10 types of caddisflies, grubs, golden needle worms, ground tigers, root maggots, root aphids, quasi-ground beetles, crickets, root leaf beetles, root tianniu, root elephant beetles and termites, of which four types are mainly grasshoppers, grubs, golden needle worms and ground tigers, with a wide range of occurrences, heavy pests, and frequent and disastrous taxa.
1. Caddisflies
It is a multi-food pest and is widely distributed in China. Adult caddisflies and nymphs bite freshly sown seeds and shoots in the soil, or bite off the roots and stems of seedlings, causing the seedlings to die and the damaged roots to appear in a messy shape. The caddisflies are active underground, piercing the topsoil into many tunnels, so that the roots of the seedlings are ventilated and the soil is separated, resulting in the seedlings dying due to water loss and drying, the lack of seedlings and ridges, and the serious destruction of seeds, so that the crop yield is greatly reduced.
2. Grubs
Grubs are the larvae of the golden turtle shell and are a worldwide underground pest. Plant-feeding grubs have a wide range of diets, preferring to eat freshly sown seeds, roots, tubers and seedlings, which is very harmful to crops.
3. Golden needle worm
Golden needle worm is the larvae of the kowtow, widely distributed around the world, harming wheat, corn and other crops, mostly feeding on the underground part of the plant, is a very important type of underground pest.
4. Ground tiger
Ground tigers are important underground pests in the seedling stage of various crops in China, and common ground tigers are small ground tigers, earth tigers and yellow ground tigers.
5. Root maggots
Root maggots are a collective term for larvae such as fly breeders and allium flies. Seed fly larvae moths the underground tissues of germinating seeds or seedlings, causing decay and death. Allium flies are mainly harmful to lily vegetables such as shallots, shallots, onions, garlic, green garlic, leeks, etc., and larvae are mothed into bulbs such as onions and garlic, causing rot, yellowing of leaves, wilting, and even death in pieces.
6. Malgen bugs
The meghan bugs are found in North China, Northeast China, Northwest China and Taiwan. Hosts wheat, maize, millet, sorghum and grasses. Adult and nymphs suck nutrients from the host's roots with a needle in their mouths.
7. Root aphid
There are many types of root aphids, including cotton root aphids, beet root aphids, and beans root aphids. The cotton root aphid uses a stinging suction device to insert the back of the cotton leaf or the tissue of the young head to suck the sap, and the affected leaf curls to the back. Beetroot aphids and bean root aphids concentrate on the roots of crops and suck sap.
8. Quasi-ground armor
Mainly distributed in the northeast of North China, northwest China, adult insects are mainly harmful to wheat, cotton, hemp, beans, etc.; larvae are pests of newly sown seeds and crop seedlings that will be unearthed, and can also bite off the rhizomes of seedlings, resulting in lack of seedlings and ridges.
9. Crickets
Crickets are important agricultural pests in Northeast China, North China, the lower Reaches of the Yangtze River and South China, destroying the roots, stems, leaves, fruits and seeds of various crops, and the damage to seedlings is particularly serious.
10. Root leaf nails
Rice root leaf beetle: Rice root leaf beetle larvae are concentrated in the root of rice to bite the whisker root, the infested rice plant grows slowly, the roots are blackened, the rice leaves are yellow, the effective tillers and panicle grains are significantly reduced, and when the whole plant is dead in severe cases, the affected rice plants are gently uprooted, and a large number of larvae and pupae can be found attached to the rice roots.