Grubs are an important underground pest. Adults or nymphs feed on the seeds, buds and roots just sown in the nursery in the soil, or bite off the roots of seedlings, and the injured parts are hemp-like. In addition, the tunnel dug by the mole cricket near the ground often separates the roots of seedlings from the soil, making them dehydrated and dry. Crickets in Africa and North China are very common and harmful.

# Bug case

African mole cricket: mainly distributed in southern China, such as Jiangsu, Zhejiang, Fujian and Guangdong. It harms the roots and young stems of many flowers, fruit trees and field crops.

[Morphological characteristics] The adult is light brown, with dense fine hairs all over, filiform antennae, oval front chest backboard and obvious dark red long heart-shaped pits in the middle. There are 3 ~ 4 spines on the dorsal inner edge of tibiofibular joint of hind foot, the abdomen is spindle-shaped, and the tail has 1 pair of tail whiskers. Oval, initially milky white, dark brown nymph, similar to adults.

[Occurrence characteristics] 1 year In the southern generation, adults or nymphs overwinter underground, unearthed in mid-April of the following year, with the first damage peak in May-June, the hot weather in July-August, moving underground, rising to the ground in September and entering the second damage peak. After the middle of June, 65438 went into the ground for the winter. Gryllotalpa lurks during the day and comes out at night, and it is most active at 9 ~ 1 1 at night, and it has phototaxis and chemotaxis to sweet substances. When the soil temperature is 16 ~ 20℃ and the water content is 22% ~ 27%, the mole cricket is the most suitable. There are many immature manure, compost and so on. In soil, this can easily lead to crickets.

【 Method for preventing and controlling mole cricket pests 】 Chemical control during sowing period is the main method, and the main measures are: ① light trapping and horse manure trapping. (2) chemical control, mainly using poisonous soil or poisonous valley and poisonous bait to kill. When making seedbeds, 22.5 kilograms of 50% Diyanon or 30 kilograms of 50% Chlordane powder are used per hectare, which are mixed with a proper amount of fine soil and then turned into the soil. Or use 10% Ibuprofen Granules 12 kg, add 450 ~ 600 kg of fine soil, mix well and sprinkle into the soil. 22.5 kg of 25% phoxim capsules or 30 kg of 5% phoxim granules can also be scattered between damaged seedlings, or evenly scattered on the ground for immediate ploughing. Poison bait poison valley: use millet11.25 ~15kg per hectare, cook until it is half cooked, take it out and spread it in the air, or stir-fry it with bean cake, rice bran and wheat bran, then mix in 750g of 75% phoxim emulsifiable concentrate, and mix it with seeds or sprinkle it in the ditch.