Maize rough disease is a viral disease transmitted by Laodelphax striatellus. The incidence of the disease: the occurrence of the disease is closely related to the density of the gray planthopper, the former crop, the sowing date, and the cultivar. Laodelphax striatellus is an effective mediator for spreading corn rough disease. The amount of gray planthopper in the field is directly related to the occurrence of corn rough disease. Wheat is the main host of the gray planthopper, and the planting area is large. After the end of May. As the wheat matures, the gray planthopper migrates out of the wheat field and enters the summer sowing crops such as corn to take food. At this time, in the sensitive period of corn (before 10 leaves), the virus disease is transmitted. Therefore, peas, garlic, barley, rapeseed and waxy corn, due to the early sowing date (in the middle and late May), often have a serious incidence; the wheat sowing corn has a late sowing period (in the middle of June), the sensitive period and the gray planthopper occur. The period is staggered and the incidence is lighter; according to the Chinese Pesticide Network , different varieties of maize have different disease resistance to corn rough disease, such as Denghai No. 3, Xianyu 335, Ludan 50, Zhongyu No. 4 and Suyu No. 9 The disease has certain disease resistance and the incidence is mild.
Control strategy: Due to the strong activity of Laodelphax striatellus on corn and the lack of resistant varieties, it is necessary to adopt agricultural measures such as adjusting sowing date and planting disease-resistant varieties in the prevention and control, while insisting on “cutting off the poison chain, The prevention and control strategy of controlling insects and diseases, grasping the seed dressing of corn seeds and the control of gray planthoppers in corn seedlings, controlling the number of gray planthoppers and reducing the harm of poisoning.
Control measures: adjust the corn sowing period, avoid the peak period of the gray planthopper poisoning - the corn seedling period to the 10 leaf stage is a susceptible stage, can expand spring corn and summer corn, do not grow semi-summer corn, make corn easy The sensitive period of the disease is staggered with the poisoning period of the Laodelphax striatellus; for the pea 茬, garlic 茬, barley glutinous rice, rapeseed 茬 corn, without affecting the post-crop crop, it can be postponed until the wheat harvest; planting disease-resistant varieties - - Can promote the cultivation of disease-resistant varieties such as Denghai No. 3, Xianyu 335, Ludan 50, Zhongyu No. 4; medicinal seed dressing - before planting, use corn seed coating agent No. 17 according to pesticide seed ratio 1:50 coating or use 40% methyl isothiophos emulsifiable concentrate is 0.2% seed dressing, which can play a role in pest control; seedling prevention and control - catching the key period of corn seedling stage, in front of corn 6 leaves Use 10% imidacloprid powder 10g/mu or 3% acetamiprid emulsifiable concentrate 10ml/mu, spray 30kg with water to control the gray planthopper, and pass with 1.5% plant disease II, 20% virus A and other plant virus passivation Mixed spray; combined with seedlings, seedlings to remove weak seedlings.
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