Potato roots damaged by earthworms In recent days, farmers in Lidingcheng, Dingzhou, Hebei Province, reported that he planted more than 40 acres of potatoes and was very conscientious in the prevention and control of underground pests. The local underground pests mainly include cockroaches, cockroaches and wireworms. Previously, they used 3911 and Tedin. Sulphur and phosphorus and other highly toxic pesticides, want to seek a low-toxic alternative agent. Prevention and control of potato underground pests should take comprehensive preventive measures. In particular, the use of pesticides with low pesticide residues should be selected, and the combination of agricultural control and chemical control is recommended. Agricultural control (1) Combine farmland in spring and autumn and pick up insects manually. Change the ground in autumn and fall to the ground in autumn and winter and deepen as much as possible to turn the overwintering larvae to the surface to make it air-dried, frozen or eaten by natural enemies, with obvious control effect; (2) It is forbidden to use unfammed livestock manure such as raw chickens. Excreta, raw pig manure, raw duck manure and other organic fertilizers to prevent adult spawning. (3) The cockroaches, cockroaches, and golden worms can trap adult worms and reduce the source of insects. During the adult period, adults were trapped with light to concentrate and kill. Medicament control can be used to treat seeds. The use of 50% phoxim or 48% of the Rospen dressing, the ratio of agents: water: seed = 1:30 ~ 40:400 ~ 500; also can choose 50% phoxim EC per acre 200 ~ 250 grams, add water 10 times sprayed on 25-30 kilograms of fine soil and mix well into poisonous soil, apply or spread the poisonous soil in potato seed trenches; phoxim and lozenge are lower residual pesticides. Prevention and control of potato pests is ideal.
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