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Prevention and control of wheat underground pests
Wheat underground pests are pests that damage the underground and near-ground parts of wheat, including cockroaches, golden worms, and cockroaches. Mainly bite seeds, roots of seedlings, stems near the ground, autumn damage caused wheat lack of seedlings, broken ridges, spring damage caused by dead heart seedlings, so that plants die early.
Types and hazards:
è¼è›„: The time of harming wheat is from the start of sowing until the second year of wheat milk ripening period. It damages wheat seedlings in autumn, eats germinating seeds by adult or nymphs, bites off young roots, or bites into chaotic seedlings. It is dead and walks through the soil to form a tunnel, so that the roots are separated and the seedlings are broken. Heavy hazards cause re-emergence of destruction.
蛴螬: The larva harms the underground seedlings of the wheat seedlings, and the roots and stems are bitten to kill the seedlings. The hazard period is the peak period of autumn from September to October and spring from April to May. In the winter, the winter is warmer in the deeper soil. In the second year, the temperature rises and the larvae begin to move to the surface. When it reaches 13-18 degrees Celsius, it is the peak period of activity. At this time, it mainly harms the green wheat and spring-sown crops. Old mature larvae pupate in the soil. Adults lurk in the soil during the day and fly out in the evening to feed on the leaves of trees and crops. Females lay eggs in deep soil about 10 cm. After hatching, larvae harm the roots of crops. One generation occurs a year. Adults or larvae overwinter. If there are many wintering larvae, the second year will be harmful.
Golden worm: The larvae bite the germinated seeds and rhizomes, and can be drilled into the intersection of seeds or rhizomes. The damage is not neat and numb, forming a dead heart seedling so that the whole plant is dead. The larvae began to endanger autumn-sown wheat in late September to early October, and winter in late October. The middle of April of the second year was the most serious.
Mai Miao victim rate 3%
(I) Agricultural Control Underground pests live in the soil throughout their lives, especially in areas where weeds are extensive and cultivated extensively. Therefore, a series of agricultural technical measures should be adopted, such as intensive cultivation, crop rotation, deep ploughing, deep ploughing, timely cultivating and weeding, reasonable irrigation, and full fermenting of various organic fertilizers, which can reduce the density of insects and reduce damage.
(II) Pharmacy Control
1. Soil treatment: Soil treatment should be used for prevention and control in a variety of underground pest-infested areas or in separate severely-occurring areas. In order to reduce soil pollution and avoid killing natural enemies, topical application and application of granules should be promoted. Use 1.5-2kg of 5% methyl isoflavone granules per acre, or 2-2.5kg of 3% phoxim granules to spread the ground evenly before arable land, and turn into soil with plough. 40% methyl isoflavone emulsifiable concentrate or 50% phoxim emulsifiable concentrate can also be used, 250ml per acre, add 1-2kg of water, and mix 20-25kg of fine soil to form toxic soil.
2. Dressing of pesticides: For the general occurrence of underground pests, the method of dressing with pesticides can be used for prevention and treatment. The ratio of commonly used pesticides to water and wheat in the control of underground pests is 40% methyl isoflavone emulsifiable concentrate: 1:100:1000 (pesticide: water: seed), 50% phoxim emulsifiable concentrate, seed dressing First, dilute the pesticide into the liquid according to the required ratio, then mix well with the seeds, mix and mix for 5-6 hours (the systemic drug should be piled up for more than 12 hours), and then sown after drying.
3. After the emergence of wheat, select a representative plot survey, when the dead seedling rate reaches 3%, immediately apply the drug control. Toxic soil: 2 kg of 5% phoxim granules per acre, or 3 to 4 kg of 3% phoxim granules, or 2 kg of 2% methylisophosphorus powder, 30 to 40 kg of fine soil, After mixing and ditching, or spreading along the ridge and then raking the soil, it can effectively control cockroaches and golden worms; scatter bait: use wheat bran or cake powder 5 kg, stir fry, add appropriate amount of water and 40% methyl After the mixture is mixed, it is sprinkled in the field in the evening, 2 to 3 kg per mu, and the control effect on the alfalfa can reach more than 90%.
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