Since the first discovery of corn cultivar in the late 1980s in Zhao County and Mancheng, Hebei Province, with the improvement of mechanized farming, the worm has been widespread in Hebei Province and has become a major pest that restricts corn yield and harvest. As a result, the hazard is aggravated, and serious damage is caused. Timely pesticide control is the key to reducing losses.
Identification of hazards: The worm occurs three generations a year, mainly in the second generation of hazards, which occurred from mid-June to early August, mainly affecting summer seedlings of maize. At the end of mid-June, after the emergence of summer maize, the eggs began to hatch as nymphs, and then migrated to the main roots of summer corn and the sheath near the ground to carry out the hazard. The stems and leaves of the damaged plants are yellow, the lower leaves are dry, short and thin, and the yield is reduced. The roots of the damaged ones become thicker, and the whole plants die withered and cannot be firm. Because the nymphs clustered at the roots, there were many small black spots on the roots, which were swollen and the root tips were black and rotten.
Identification of adult morphological features: female adult body length 3 ~ 4.21mm, width 1.4 ~ 2.1mm, long oval and slightly flat, the sides are similar to parallel, reddish brown, covered with white wax powder. The male adult has a body length of 1.42 mm and a width of 0.27 mm. The body is delicate and the whole body is dark brown.
Prevention and treatment recommendations: Among the three generations that have occurred, the second generation is the key generation of prevention and control. In view of the strong resistance of the eggs to the harsh environment, the female adults and the 2nd instar nymphs are protected by wax powder and have strong resistance. Therefore, the best period of prevention and control is the active larval stage. In addition to taking measures such as cropping, ploughing, cultivating and weeding, only the implementation of chemical control can control its damage. China's pesticide network recommends the use of chemical root irrigation, it is recommended to use the cultivating sunflower powder in the second generation of the first instar larvae 1000 times liquid, or 500~1000 times liquid ethyl 1605 liquid for root irrigation.
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