The common scarabs in scientific tea plantations include Anomala corpulenta Motsch., Ho10trichia diomphalia Bates. and Serica orientalis Motsch. Both are Coleoptera, the former belong to the family Lacertidae, and the latter two species belong to the family Scarabaeidae.
Host tea plants and other agricultural and forestry crops.
In the tea plantation, these three species of larvae can occur alone or in combination, mainly injuring the roots of tea plants. The main roots or lateral roots of tea seedlings are often severed and the young and old tea plants are often victimized, resulting in new plantations. Lack of line breaking or lack of seedlings. Adults bite tea leaves.
Morphological characteristics Adult beetles have a body length of about 19 mm, an elliptical shape, a thick green frontal and frontal chest, and yellow edges 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. The northeastern black beetle sees the underground pest, a northeastern great blackbird. 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. The frontal part of the bowel margin 2 teeth. 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.
Habits of green turtle turtle year in Hunan generation, larvae in the soil in winter. 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. The northeastern black beetle is 2-3 years old in the northeast, 1-2 years old in Hebei, and the annual generation in Hunan and Yangtze River valleys. It is wintering in the soil with larvae or adults. 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 bite and eat the root of the paralyzed layer in the top soil layer of 10 to 15 cm deep, in early 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.
Control methods (1) Manually picking up ploughs or releasing chickens and ducks for food when arable land is used. When the adult was in full bloom, using its suspended animation, under the concentrated tea tree at night, the plastic film was spliced ​​and shaken to kill. (2) During the prosperous period of adulthood, using its phototaxis, light trapping or trapping in the evening light is preferable. If necessary, it is better to install black light. In addition, planting ramie around the tea plantation also has a good trapping effect on adults. After the detection of poisoning, it is necessary to promptly dispose of the parasitized adult and prevent it from waking up. The sauerkraut field has a trapping effect on the black green turtle shells and poplar leaves against the black velvet beetle, and may be added with a small amount of insecticides to trap and kill. (3) When the amount of adults is large, 50% malathion EC or 75% phoxim EC and 40% dimethoate EC 1000-1500 can be sprayed on the tea bush, which can kill many adults. (4) Before the larvae have not yet larvae and unfeathers the larvae, the larvae have a large density of tea plants. The 2.5% imidophos powder is applied under the tea stalks. About 100 g per plexus, the soil is loosened. Prevention and control of larvae can also be used together with soil poisoning, use trichlorfon or dichlorvos, phoxim, 100-150g per 667m2, add a small amount of water to dilute 15-20kg of fine soil, and combine fertilization with broken cakes. The powder is mixed with insecticides to make poison baits, which are applied to the rhizosphere soil and trapped and killed. (5) Conditional use of Beauveria bassiana, Lactobacillus spp. for soil treatment and good results are also available. Attention should be paid to the protection and use of natural enemy insects such as black-footed black-footed bumblebees, black-spotted bumblebees and black-beetles for biological control.
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