Gryllotalpa, also known as Larrabee and Eupolyphaga, is an omnivorous pest and likes to eat all kinds of vegetables, especially those in protected areas. Due to the warm microclimate, crickets act early and do serious harm. Both adults and nymphs can be harmed, and the roots of leeks can be bitten into a ball, resulting in lack of seedlings and broken ridges. When the mole cricket passes through the soil surface, many tunnels are formed, which makes the seedlings leave the soil and die.

(2) Occurrence regularity

Gryllotalps overwinter underground as adults or nymphs, and the depth is above the groundwater level and below the frozen soil layer. It enters the plough layer in March every year, and the damage is the most serious from late April to early June. From late June to August, it is the peak of spawning to dive into deep soil and spend the summer. From the beginning of September until the soil freezes, it will dive to the surface to destroy it. When the air temperature is 12.5 ~ 19.8℃, the soil temperature is 20 cm deep 15.2 ~ 19.9℃, and the soil water content is above 20%, the damage is the most serious. This is more serious in wet, loose and sandy loam plots.

(3) Prevention and control methods

(1) black light trap. Grubs have strong phototaxis, and black light can be used to trap and kill them where conditions permit.

② Manual control. In summer, at the peak of cricket spawning, find the cricket spawning ground, shovel the topsoil first, find the spawning hole, and dig down 10 ~ 18 cm. You can dig out the eggs, and then dig down about 8 cm to find the females.

③ Chemical control. Use 50 grams of 90% crystal trichlorfon, add warm water 15 kg, stir-fry 30 kg of wheat bran or cottonseed cake, and scatter it in the ground at night to trap and kill.