The scientific name Cephus pygmaeus linnaeus is Hymenoptera, Stemoptera. Distributed throughout the country. In addition, there are C. fumipennis Eversmann's stem-winged wheat stem bees, distributed in Henan, Qinghai and Gansu provinces.
Host wheat, barley and other wheat.
The larvae bore the stems and culms. Serious stalks were eaten empty. The mature larvae penetrated into the rhizomes. The stalks were cut off from the rhizomes or only a small amount of epidermis was connected. The sections were neat, and the affected wheat was easy to fold.
Morphological characteristics Adult body length 8-12mm, abdomen slender, all black, antennae filamentous, wing membrane transparent, forequarters dark brown, wing wings, female bee abdomen section 4, 6 and 9, inlaid with yellow horizontal band, The abdomen is more fat and there is a zigzag ovipositor at the end. The drones also produced yellow bands on sections 3-9. The ventral side of the 1st, 3rd, 5th, and 6th ventral segments each had 1 large light green spot. The back of the abdomen had 1 pale green triangle point on the back, and the abdomen was small and uniform in thickness. Eggs about 1mm long, long oval, white and transparent. The last instar larvae have a body length of 8-12mm, body milky white, head light brown, degenerate into small protrusions of the chest, the body is more wrinkled, and the hip section is extended into a short chitin tube. The dragonfly is 10 to 12mm long, yellowish-white, and turns black when it is feathered.
Life habits are born for 1 generation, and the mature larvae live in the base of the stem or in the root pods. In April of the following year, eclosion was observed. In mid-May, the eclosion occurred. In late May, the peak of eclosion was reached. The eclosion period lasted for more than 20 days. After emergence, the females laid their eggs in the thin straw stalks with 50 to 60 eggs. Up to 72 grains, most of the spawning sites are located near the stem sections of the 1-3 sections of the wheat spikes. When spawning, spawns are used to saw a small hole in the wheat stems and the eggs are scattered on the inner wall of the stem. In the egg period 6-7 days, the larvae feed on the inside of the stem wall after hatching. After the third instar, they enter the gluttony stage and often bite the stem section or the entire stem is eaten empty, gradually feeds down to the base of the stem, and the wheat ear turns white. After the larvae are mature, the larvae will live in the roots of the larvae and pass through the winter.
Control methods (1) After the wheat is harvested, deep-turning, collecting wheat stubble fertilizer or burning, has the effect of inhibiting the emergence of adults. (2) Perform a large area of ​​rotation as much as possible. (3) Breeding stalk wall thickness or hard insect-resistant high product species. (4) Occurrence of severely affected areas may spray 90% crystals of trichlorfon 900 times or 80% dichlorvos EC 1000-1200 times during the peak period of adult flowering in the flowering period of artichoke in late May, and may also spray 1.5% dimethoate or 2.5% trichlorfon powder, 1.5-2.5kg per 667m2.
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