In recent years, due to changes in climatic conditions and prevention and control measures, the damage caused by corn field ridges has been increasing, and in some places in Huaxian County, the original secondary pests have risen as the main pests. The prevention and control measures are now described as follows: First, the characteristics of damage. Cockroaches are omnivorous and feed on the seedlings of corn plants. Summer mid-June and late July to early July are the nymph larvae at the height of the nymphs, and 9-10 months are the culmination of adult worms. These two periods are the main damage period. Second, the law of occurrence. The quail usually takes 1 generation in 1 year and winters in the soil with eggs. A total of 6 instar nymphs, from late April to early June the nymph hatched unearthed, from July to August for the nymph larvae of the great age. Adults began to appear at the beginning of August and September was the peak period. Adults begin to die in mid-October and individual adults can survive until mid-November. Meteorological conditions are important factors that affect the occurrence of earthworms. Generally, there is more rain in April and May, and the soil has high humidity, which is conducive to nymph hatching. Heavy rain or heavy rain from May to August is not conducive to the survival of nymphs. Third, prevention and control technology 1, turning soil buried eggs. Earthworms usually produce eggs in 1-2 cm of soil, plowing land in winter and spring, buried the eggs deep in the soil below 10 cm1, nymphs difficult to hatch out of soil, can significantly reduce the effective hatching rate of eggs. 2, heap grass trapping. The nymph and adult worms have obvious concealment habits during the day. A certain number of 5-15 cm thick haystacks are set in the corn field or on the top of the field, which can induce large numbers of young and adult worms, concentrate hunting, and have a good control effect. 3, chemical control. In the field where the density of corn fields is high, 80% dichlorvos, 50% methyl 1605, 50% phoxim, 50% methamidophos, etc. can be used to dilute 1500-2000 times spray. Or use wheat bran bait, diluted with 50 grams of the above solution plus a small amount of water and then mix 5 kg of wheat bran to spread 1-2 kg per mu; fresh grass bait is diluted with 50 g of liquid medicine plus a small amount of water and mixed with 20-25. Kilograms of fresh grass are spread over the cornfield. Because of its strong mobility, it is necessary to pay attention to uniform prevention and control when it comes to prevention and treatment, otherwise it is difficult to obtain more durable results.