The main pests of wheat that damage the ground are fleas, cockroaches and golden worms, which mainly occur in the autumn seedling stage of wheat and after the green season and the filling stage.
1, è¼è›„
The time it takes to harm wheat is that from the start of sowing until the milk ripening stage of the following year, it damages wheat seedlings in the fall, eats germinating seeds with adults or nymphs, and snaps off tender roots of young roots, or bites into a mess to make them die. In the soil surface through the activities into a tunnel, so that the root and soil separation and lack of seedlings. Serious damage caused by replanting.
2, 蛴螬
The larvae endangered the underground tiller section of the wheat seedlings, and bite off the roots to make the seedlings die. The endangered period is from September to October in autumn and from April to May in spring.蛴螬 In winter, when winter is in deeper soil, temperature rises in the spring of the second year, and the larvae start to move to the surface. When the temperature reaches 13-18 degrees Celsius, it is the peak period of activity. At this time, the main hazard is returning to the green wheat and spring sowing crops.
Mature larvae phlegm in soil. Adults lurk in the soil during the day and fly out of activity in the evening, feeding on the leaves of trees and crops. The females lay their eggs in deep soil of about 10 cm, and the hatched larvae endanger soybeans, peanuts and wheat seedlings. One generation a year. Winter or adult larvae. For example, there are many overwintering larvae, and the damage in the following year is heavy.
3, goldworm
The larvae bite on the germinating seeds and rhizomes and can drill into the intersection of seeds or rhizomes. The damage is not neat and numb. The formation of dead heart sprouts results in the death of the whole plant. In the spring from March to May, the fall from September to October is the damage period.
The common dung beetles can take 2-3 years to complete a generation, most of which are larvae wintering in 23 to 33 cm soil layers, and the temperature below 8 cm in 10 cm below ground, the larvae begin to move; when the soil temperature reaches 8 to 12 degrees Celsius , rising to the periphery of the wheat began to injure. The damage was most severe in mid-April. When it is arid or rainy, the larvae hide in the deep layer and the damage is lighter. The females lay their eggs in a 3 to 7 cm soil layer.
From late September to early October, the larvae began to jeopardize the autumn sowing of wheat and wintered in late October. Grub adults do not feed. The larvae are at the peak of the damage period from the turning green stage to the booting stage of wheat every year. They mainly feed on the young part of the basal stalk, cut off the tissue that conducts nutrition, and make the upper stems wither. In particular, the early spring activities of thin-breasted worms are seriously endangered.
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