Scientific name Dolerus tritici Chu. Hymenoptera, leaf bee family. Alias ​​Qi headworm, small armyworm and so on. Distributed in East China, North China, Northeast China, Gansu, Anhui, Jiangsu and other provinces.
Hosts such as wheat, barley, and auntie, etc.
Injury is characterized by the larvae feeding off the leaves, leaving only the veins seriously damaged.
Morphological characteristics Female adults 8.6-9.8mm body length, drones 8-8.8mm, body part of the black with a slight blue light, pronotum, middle thoracic anterior scutellum, fin substrate rust red, wing membrane transparent yellow, The head shell has a reticular pattern. The lip base is slightly engraved and the center has a large gap. Tentacle line 9 knots. Egg length 1.8mm, kidney-shaped, smooth surface, light yellow. The last instar larvae are 18-19mm long, cylindrical, slightly thicker in the chest, slightly thinner at the end of the abdomen, with transverse wrinkles in each joint. The head is tan, the upper lip is asymmetric, and the left side is larger than the right side. The chest and abdomen were gray-green and dark blue on the back, with 1 pair of dark spots on the back of the distal section and 1 dark marking on the base of the abdomen.蛹 9.3mm long, yellowish white, brownish black when near feathered.
Living habits are born one generation old, and wintering in the earth. Adults emerged from March to April of the following year. After mating, spawners were used to saw 1 crack along the main veins of the leaves. Spawns were formed by sawing and sawing. Eggs were clustered. The egg period was about 10 days. In mid-April to mid-June, larvae were introduced. During the damage period, the larvae were buried in the earth to make earthworms over the summer, and the larvae passed winter in October. Adults like to be active from 9 to 15 hours, and their flying power is not strong. They hide at the roots of wheat and barley at night or on cloudy days. Adults live for 2-7 days. The larvae were 5 instar. After the 3rd instar, they were hidden in the lower part of the wheat plant or under the clods during the day and they were harmed at night. After entering the 4th instar, the food intake increased rapidly. The larvae had a pseudo dead nature, hi wet and cold, and avoided dry heat. High temperatures in winter, adequate soil moisture, high temperature and low temperature in late spring, and small rain in March, are conducive to the occurrence of this pest.
Control methods (1) Agricultural control The mature larvae spend a long time in the soil. When the wheat is harvested, it can be ploughed in time to destroy the soil maggots and kill the larvae. (2) During the larval stage, spray 90% crystals of dipterex 900 times, 80% dichlorvos 1000-1500 times or 80% phosphoamine 2000 times before 3rd instars. (3) Using artificial dead larvae, artificial killing is performed in the evening. (4) A large number of crops in the field can be sprayed with 2.5% trichlorfon powder or 1.5% dimethoate powder, sprayed with 1,5-2.5kg per 667m2, and the above-mentioned insecticide can also be used to add 25kg of fine soil to remove wheat straw along the ridge. .
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