Triticum aestivum

The scientific name is Apophylia thalassina (Faldermann), Coleoptera, Phyllostachys. Also known as wheat stem leaf beetle,@#@245@#@golden flower insect. Distribution north from Heilongjiang, Inner Mongolia, south limit does not cross the Huaihe River, west to Kuansu, Qinghai. Shanxi, Gansu and Hebei are becoming more and more serious.

Host wheat, corn, wolfberry, thistle, willow, etc.

Damage characteristics Larvae from the soil 1.5 cm into the wheat stem damage, resulting in dead seedlings and white ears, ineffective mulberry, resulting in large wheat field seedling shortage broken ridge. A devastating pest of wheat.

Morphological characteristics Female adult body length 7 - 9 mm, elytra bronze, after the expansion of the abdomen beyond the elytra cover; male adult body length 6 - 7mm, head front yellow brown, black brown rear, antenna 11, whip, yellow prostrate, there are 3 black stripes, the middle is larger, elytra green fluorescent, dense yellow fine hair. Egg 0.8 - 1.5mm long, oval, pale yellow at first, bluish gray in winter. The last instar larvae are 9 - 12mm long, yellow-brown, black-brown on the prothorax shield plate and hip plate, and dark black spots of different sizes are arranged neatly on the back of the body. Naked pupae 6 - 9mm long, beige, cylindrical, with 2 hip spines at the end.

Life habits North China annual generation, eggs in the ground once a m winter, the next year in late March, wheat jointing, eggs began to hatch, early April wheat jointing peak into the egg incubation peak. From jointing stage to booting stage of wheat, the larvae of wheat stemleaf beetle were at their peak, the larvae began to pupate at the early stage of booting stage of wheat, and the larvae entered the peak stage of pupation after flowering and filling of wheat. The larvae have the habit of damaging plants, and each larva can damage 7 - 16.9 plants. Adults often swarm on thistles in the morning and evening, eating the leaves into numerous holes, even leaving only a small portion of the main vein. Eggs are scattered in crevices and loose soil. The occurrence of this insect is closely related to topography, cultivation and meteorological conditions. It is easy to occur in shallow mountainous and hilly areas, continuous cropping wheat fields and extensive cultivation fields, and occurs heavily in years with more rain in the peak incubation period.

Control methods (1) Remove Thistle from wheat field in mid-late May, which can reduce the opportunity of adult oviposition. (2)At the peak of adult emergence, spray 90% crystalline trichlorfon 1000 times solution or 50% dichlorvos EC 1000 times solution, 50% 1605 EC 1500 times solution, 10% flumethrin EC 1500 times solution, 2.5% Baode EC 2000 times solution, 2.5% cypermethrin EC 2000 times solution, 50% malathion EC 1000 times solution. (3)Egg treatment. Autumn deep ploughing 25 - 30cm, can kill eggs. (4)Treatment of larvae. 1.5% methyl 1605 powder or 2.5% trichlorfon powder or 2% fenitrothion powder, about 2kg/667m2, combined with intertillage and watering, and planting with pesticide, can prevent larvae from turning into plants and damaging them. Can also be used 40% dimethoate EC 2000 times or 50% 1605 EC or 90% crystal trichlorfon 1000 - 2000 times solution irrigation roots.