According to the prediction of the National Agricultural Technology Center, the occurrence of corn pests and diseases in the country in 2018 is heavier than normal. The corn borer, armyworm, underground pests and large spot disease in the northeast and north China are seriously damaged. In the Huanghuaihai area, corn borer, cotton bollworm and the genus Brown spot disease is prominent, and cotton bollworm, aphid, leafhopper, armyworm and small spot disease are common in northwest and southwestern areas. The specific control techniques for major pests and diseases of corn are as follows:
The corn stalks are smashed and returned to the field to reduce the number of insect source bases; the overwintering adult worms use insecticidal lamps combined with attractants to induce killing; the adult mites release the red-eye bees to kill eggs. At the end of the heart leaf, spray the Bacillus thuringiensis preparation, or use chlorantraniliprole, thiamethoxam, and cyhalothrin to spray with the compound, to improve the control effect, and treat the pests such as aphids and red spiders.
Seedling pests such as underground pests and thrips, aphids, and planthoppers are treated with thiamethoxam and cyanamide. According to the occurrence of pests at the seedling stage, insecticide sprays such as methicillin and chlorantraniliprole are used for prevention and treatment. Use the nicotinsulfuron herbicide plot to avoid the use of organophosphorus pesticides to avoid phytotoxicity.
Root rot, head smut and stem rot are selected for disease resistance. The seed treatment is carried out by using a flavonoid/fine nail suspension seed coating agent or a seed coating agent such as difenoconazole or tebuconazole.
Maize leaf spot diseases are selected from disease-resistant varieties, reasonably densely planted, and scientifically fertilized. At the end of corn heart leaf, spray fenflurazole, diniconazole, pyraclostrobin, Jinggangmycin A and other agents, spray again every 7 to 10 days depending on the incidence, brown spot disease recurrence area Maize 8 to 10 leaf stage medication control. Mixing with brassinolide and the like can improve the control effect.
The sheath blight is selected from resistant varieties and is reasonably densely planted. In the early stage of the disease, the leaf sheath of the stem base can be stripped, and the bio-pesticides such as Jinggangmycin A or the sclerotium net, diniconazole, mancozeb and the like can be combined and sprayed once every 7 to 10 days depending on the incidence.
The aphid corn is in the male stage, and the mites are sprayed with thiamethoxam, imidacloprid, acetamiprid, pymetrozine and the like at the beginning of the aphid.
Ye Hao timely cleared the weeds in the fields. When the spot is taken, sprays such as scorpion, thiazolone, ketone, and avermectin are used to focus on the middle and lower leaf backs and the weeds in the corn surrounding the field.
The early release of cotton bollworms releases the eggs of Trichogramma, or the spraying of Bacillus thuringiensis, methicillin, chlorantraniliprole, etc.
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