Small tigers, also known as Tussica, silkworm, black soil silkworm, black silkworm, cutworm. Damage to all vegetable crop seedlings, with beans, solanaceous fruit, melons, and cruciferous vegetables being the most serious. In warm and humid conditions, the optimum development temperature is 13-15°C, rivers and lakes or low-lying ridges, abundant rainwater, and perennial irrigation areas. Loam, clay, loam, and sandy loam are all suitable for soils with loose soil, good aggregate structure, and high water retention. The occurrence of small tigers. Especially in the early springtime, where there are many weeds in the vegetable fields and surrounding weeds and where spawning can be provided, there are many nectar-sourced plants, which can provide supplemental nutrition for adults. In this case, larger insect sources will be formed and serious damage will occur. 1. Damage characteristics The main damage spring vegetable seedlings, newly hatched larvae are often clustered on the seedlings on the heart leaves or leaves on the back feeding, the leaves bite into small nicks or mesh-like. After 3rd instar, the larvae bite off the stalks of the vegetable seedlings near the ground. They often drag the bitten seedlings into the hole. The upper leaves of the larvae are often exposed outside the hole, causing the whole plant to die, causing the lack of seedlings to break the ridges and destroy the seedlings. You can also drill into eggplant, pepper fruits or cabbage, cabbage leaves, which seriously affect the yield and quality of vegetables. 2. Control methods 1 Agricultural control In winter and spring, remove weeds in and around greenhouses to prevent adults from spawning inside and outside greenhouses. For those who have already spawned and found 1-2 instar larvae, they should spray and then weed before the individual larvae are buried. The weeds removed should be kept away from the vegetable fields and destroyed or composted. 2 trapping and killing prevention First, the black light is used to seduce the adult; the second is to kill the adult with sweet and sour liquid, that is, 6 parts of sugar, 3 parts of vinegar, 1 part of white wine, 10 parts of water, 1 part of 90% trichlorfon and mix thoroughly, or use kimchi Add appropriate amounts of pesticides to the water and set them at the stage of adult emergence. Some foods that are fermented and sour, such as sweet potatoes, carrots, rotten fruits, etc., can also be trapped to kill adults. The third is bait trapping and killing adults, first bait (grain, wheat bran, bean cake, cottonseed cake or corn crumbs) 5 kilograms of saute, and then use 90% trichlorfon 30 times liquid 150 g mix, the amount of water, to mix The tide is 1.5-2.8 kilograms per mu, which is spread in the windless and stifling heat in the evening. Can also be used 40% Dimethoate EC 10 times or other insecticide mixed bait, 4-6 per square meter bolus. The fourth is the trapping of larvae by the grass. Before the nursery or colonization, the young tigers only feed on the weeds in the field. Therefore, we can choose the small earthworms to eat crickets, bitter leeks, mugwort, imperata and other weeds. Tiger larvae. 3 Manually picking up the early morning to open up the topsoil near the seedlings, can catch latent old larvae, good results for several days. 4 Chemical control The larvae of 1-3 instar larvae have poor drug resistance and are exposed on host plants or on the ground. It is a suitable period for chemical control. Can choose to use 2.5% deltamethrin EC 3000 times solution, or 90% trichlorfon crystal 800 times solution, 50% phoxim EC 800 times solution spray control. Toxic soil method using pyrethroid pesticides, made of arsenopyrite, 50% phoxim EC 0.5 kg water mixed fine soil 50 kg, the amount of 20 kg per acre, anterograde application of seedlings near the rhizosphere. When the worm age is relatively large, 80% of dichlorvos EC and 50% phoxim EC can be used to irrigate the roots. Small Molecule Peptide,Collagen Peptide,Yam Peptide Powder,Herb Ginseng Peptide Fufeng Sinuote Biotechnology Co.,Ltd. , https://www.sinuotebio.com