The beetles that damage sesame are mainly the northeastern big black beetle, the black cashew beetle and the beaded green beetle.
The scientific name is Ho10trichia diomphalia (Bates), Ceratopsis orientalis Motschulsky, Anomala corpulenta Motschulsky, both of which belong to the order Coleoptera. The first two species belong to the family Scarabaeidae, and the begonias have the family Scarabaeidae. Distribution in the country's ramie production areas.
Host ramie and so on.
Injury characteristics Adults bite on the leaves into nicks or holes, leaving only the base of the veins. The larvae damage the bark root, underground stem, vegetative root cortex or gradually deep pith, and some partial eclipse roots, stem side, the formation of irregular wounds, serious underground stem or root base snapping or feeding empty.
Morphological characteristics of the northeastern black beetle see the underground pest a northeastern big black beetle. The black velvet beetle adults are 6-9mm long and 3.4-5.5mm wide. Small, oval, dark brown to tan, velvety. Smooth back behind head. There are nine tentacles and a few ten festivals. There are nine and ten tentacles on each side. Coleoptera with 9 grooves. The hip plate is large, triangular and engraved with dots. The ventral plate of the chest was densely covered with villi, and the abdomen sections had a row of hairs on the webs. 2 teeth on the outer edge of the forefoot. Larvae body length 14-16mm, head width 2.5-2.6mm, front head bristles and frontal hairs on each side of a side, no amount of frontal hair; upper lip bristles at the base of two sets of horizontal; anal ventral posterior The spiny bristles are slightly curved at the tip of the head, and the front of the hair group is double-humped. The exposed area is wedge-shaped toward the end, dividing the hair-covering area into two. The bristles are located at the trailing edge of the hair-covering area and are arranged in a horizontal arc. , composed of 16-22 cone-shaped thorns, the middle was significantly interrupted. The body of the adult beetle is about 19mm in length, oval in shape, with thick green on the front and back of the chest, and yellow on both sides of the pronotum. The back of the body is green and bright. Compound eye red and black. The tentacles are pale yellow-brown and consist of 7 sections. The body's ventral surface and its feet are tan. The festivals and festivals of the foot are red-brown and the festival consists of five sections. Egg oval, milky white. The larvae have brown heads and white milky bodies. Uncle naked. The first time when the white, white, after the gradient light brown.
Habits of life northeastern black beetle 2-3 generations in the Northeast, Hebei 1-2 generations, Hunan, the Yangtze River valley generation of generations, are larvae or adults in the soil in winter. The overwintering adult was unearthed in late April. In mid-May and mid-June, the adult began to infest and lay eggs in the soil. The larvae gnawed the roots of the paralyzed roots in the 10-15cm deep topsoil, early in June and early September. Injury to two hemp and three hemp, in early September, phlegm, in mid-October into adult. The black velvet beetle is born in Beijing, Liaoning, Shaanxi, and Gansu Provinces for one generation per year. In the spring of mid-April, Hunchun had unearthed animals and had the habit of “excavation after rainâ€. From the end of April to the beginning of June, it was a period of activity. Adults had strong flying ability, phototaxis and suspended animation. In the Yangtze River basin, the golden tortoise survived its larvae and piled eggs in the soil near the roots of the affected hemp roots. The old larvae were buried in underground chambers. Feathering to adulthood began in mid- and late August, that is, wintering in the original soil chamber. The beaded turtle is born in Hunan for generations and winters as larvae in the earth. In March of the following year, we continued to take palsy, and in May we began to immerse ourselves in earthworms. Adults emerged in early June, and they were found in mid-June and were seen in late July. With phototaxis, the worm spreads overnight and lays loose eggs in the soil. Each female produces 50 to 60 eggs. A new generation of larvae emerged in early July and entered the hatching period in late July, mainly affecting three hemp and the next year hemp.
Control methods (1) Before planting new hemp, flood the larvae. (2) In the hatching period of egg, spray 100 g of 50% methamidophos EC every 667m2 and pour water on it to kill the newly hatched larvae. (3) Place a black light or use a fire to trap adult insects in the windless and hot evening. (4) Adults prefer to eat or copulate on maples, eucalyptus, eucalyptus and willows. Spray 90% crystals of trichlorfon 800 times or 50% dichlorvos EC 1000 times, and 25% ecstasy 1500. Double fluid, once every 7-10 days, continuous control 2-3 times.
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