Oriental beetle

Oriental beetle, also known as black velvet Gill beetle, velvet beetle. It belongs to the family Coleoptera. It is widely distributed and has miscellaneous feeding habits. Both adults and larvae can cause harm and can harm more than 100 species of plants. Adults are addicted to poplar, willow, cherry blossom, magnolia, magnolia, Koeluan tree, sycamore, peach, crape myrtle, heather and other dozens of garden plants.

Morphological characteristics: the adult body is 7 to 9 mm long and 4.5 to 6 mm wide, ovoid, narrow in front and wide at the back; brown at the beginning of Eclosion, then gradually dark brown or black, with densely velvety brown tomentose on the body surface; 10 nodes of antennae, reddish brown; the forechest dorsal plate is densely covered with fine scratches; there are 9 shallow longitudinal grooves on each sheath wing, which are small and dense. The egg is oval, 1.2 mm long, milky white, smooth. The larvae are milky white, the body length of the mature larvae is about 15 mm, the head width is about Z7 mm, there is 1 hair on each side of the anterior parietal hair and the middle forehead hair on each side; there is a brown single eye on each side above the base of the antennae, which is composed of color spots and no crystals; the ventral prickles of the gluteal segment form a curved transverse band composed of 20 to 23 conical spines, which is interrupted at the center of the transverse band. Pupa yellowish brown, about 8 mm long, compound eyes scarlet.

The life habit occurs one generation a year. Overwintering as adults in the soil. In the middle and lower reaches of the Yellow River, the activity usually begins when the ground temperature of 10 cm is more than 10 degrees Celsius from late March to early April, and the peak period of adults is from mid-April to May, and the suitable temperature is 20 to 25 degrees Celsius. Adults lie dormant during the day and fly at night, flying around the crown in the evening, and like to encroach on the leaves, buds, buds or petals of more tender garden trees (shrubs and small trees), causing serious harm. The harm is characterized by cluster continuous harm, overeating and large food intake. Sometimes all the leaves of the damaged trees are eaten up, while the neighboring plants show no sign of being harmed. The adults have strong phototaxis, false death and the habit of concentrated unearthed after rain. The number of adults decreased in June. The first and middle of May is the peak period of adult copulation, and the male adult dies immediately after mating. Female adults lay eggs in soil 10 to 15 centimeters deep. The eggs are scattered or more than 10 eggs are gathered in one place. Generally, each female lays dozens of eggs, and the egg period is 5 to 10 days. The larvae are 3rd instar and feed on tender roots and humus. The mature larvae pupate in the soil layer of 20 to 30 cm, and the peak period of Eclosion is in the middle to late August. At that time, most of the feathered adults did not come out, that is, they were dormant for the winter.

Prevention and cure method

1. Taking advantage of the characteristics of false death and cluster harm of adults, the warm and windless night from 6 to 8 p.m., the trees with obvious adult damage were covered with plastic film, and the method of artificial vibration was adopted, and the effect was good.

two。 For flowers and trees that are continuously harmful, spraying around the crown with 1000 times of omethoate EC or 1000 times of trichlorfon in the evening can kill most of the adults, and those who are not killed will generally move elsewhere.

3. According to the strong phototaxis of adults, a black light can be installed in every 3 to 5 mu where possible.

4. Lawn and garden trees must be rotten and disinfected when applying organic fertilizer. Oriental beetles are fond of chicken dung and should pay special attention to it. This kind of beetle mainly lives in shallow soil. Winter irrigation in early winter and watering green water in spring can eliminate most of the overwintering adults.

5. During the peak period of damage to adults and larvae, sprinkle 3% carbofuran particles per mu before rain or watering, or mix evenly with 40% methyl isosaliphate EC 500 ml per mu.