How to eliminate Noctuidae pests

Noctuidae pests are a type of omnivorous pests that are widely distributed and miscellaneous. According to the survey, the pests of the Noctuidae family in Sichuan are mainly Spodoptera exigua, Brassica napus, and Spodoptera litura, among which the Spodoptera exigua is a severe pest that only frequently emerged in the middle and late 1990s. Occurrence characteristics: Spodoptera exigua can harm 29 kinds of vegetables, 19 kinds of field crops, of which the most serious damage to the onion. The danger feature is that the young larvae enter into the onion tube for feeding from old age to old age. The concealment is very strong. After the onion leaves are killed, the dead skin is left. When serious, all the onion leaves are eaten. It is not easy to be discovered at the early stage of damage. When the onion is found to be infested, the worm age is more than 3 years old, and the drug resistance is strong, so it is difficult to control it with chemicals. In addition to harming cruciferous vegetables, Brassica julibrissin and Spodoptera littoralis also harmed vegetables such as melons, beans, and peppers, mainly feeding on larvae. Newly hatched larvae are concentrated on the back of the leaves feeding on the leaves and residual epidermis, disperse the hazards after they are large, eat the leaves into small holes, and can cause serious losses when they occur in large quantities. Spodoptera exigua and Spodoptera litura can occur for 4-5 generations each year, and Brassica oleracea occurs for 2-3 generations each year, both wintering with pupa or adults. Noctuidae pests are a type of thermophilic pests that have a high resistance to high temperatures. The occurrence of the peak period from July to September, comprehensive measures should be taken to prevent and control. Control methods: 1. Deeply turning the land in winter to remove weeds on the fields, especially weeds all around the onion. After the onion is harvested, the onion should be ploughed and irrigated in autumn to eliminate overwintering insects. 2, install Jiaduo vibration type insecticidal lamp trap adult. This method is particularly suitable for the use of pollution-free vegetable bases. 3. Remove eggs by hand and capture larvae. Egg masses are produced on the back of the leaves with white scales on them for easy identification. After 3rd instar larvae are concentrated on or near the leaves of spawning eggs, manual removal of egg masses and capture of larvae can mitigate the hazards. 4, drug control: In the young larvae during the period of drug use. When the onion appears dry tip, use 5% Sodium Tetrachloride 4000 times; or 25% Diflubenzuron No. 3 1000 times; or 10% Divide the suspoemulsion 3000-4000 times liquid spray. Should pay attention to alternate medication to prevent pests produce resistance. (Provincial Agriculture Department Plant Protection Station Luo Huaihai)

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