Hypomeces squamosus Fabricius belongs to the order Coleoptera. Alias ​​blue green elephant, green plush elephant worm, cotton leaf weevil, large green elephant worm and so on. Distribution Henan, Jiangsu, Anhui, Zhejiang, Jiangxi, Hubei, Hunan, Guangdong, Guangxi, Fujian, Taiwan, Sichuan, Yunnan, Guizhou.
Host tea, oil tea, citrus, cotton, sugarcane, mulberry, soybean, peanut, corn, tobacco, and hemp.
Injury characteristics Adults eat leaves into nicks or holes, damage the leaves of newly planted tea trees, causing death of plants.
Morphological characteristics Adult body length 15-18mm, body black, the surface of dense pink glitter green scales, a few gray to grayish yellow, the surface often accompanied by orange-yellow powder and yellow-green, some individuals close to gray or brown scales. Head tube back. Flat, with 5 vertical grooves. Antennae are short and thick. Compound eyes are prominent. The chest width is greater than the length, the back has a wide and deep middle groove and irregular nicks. Each of the elytra wings has 10 lines of engraved points. Female breast shield velvet hair less, relatively smooth, sheath wing flank angle is wider than the back of the chest back, the abdomen is larger; male chest shield velvet hair more, sheath wing flank angle and the chest shield equal width, abdominal smaller. The eggs are about 1mm long, ovoid, pale yellowish white, and dark black before hatching. The last instar larvae are 15-17mm in length, most of them are wrinkled and have no foot, milky white to yellow-white. Bare clams are about 14 mm long, yellow-white habits in the Yangtze River Valley 1 generation, South China 2 generations, adult or mature larvae winter. In April-June, adults became active. Guangdong can be seen as a whole year-round damage. In Zhejiang and Anhui, larvae were found to be overwintering. In June, adults became prolific. In August, adults began to spawn and lay eggs. Xishuangbanna, Yunnan Province, entered the peak of emergence in June. The overwintering adult of Fuzhou was unearthed in mid-April and entered the peak period in mid- and late June. Adults decreased significantly in mid-August, spawned from late April to mid-October, larvae hatched from early May to mid-October, and mid-September In mid-October, the adult ecloses that emerged in late September were only partially excavated, and the adults that emerged in October crouched over the winter in the soil. Adults are active during the day, flying weak, crawling, clustering and feign death. After unearthing, they climb to the shoots to injure young leaves and can mate many times. Eggs were scattered on the leaves more than a single grain, spawning period of more than 80 days, more than 80 eggs per woman. After hatching, the larvae drilled into the soil and fed the weeds or roots at a depth of 10-13 cm. The larval period is more than 80 days and the hatching in September lasts for 200 days. The larvae matured in 6-10cm soil after being cooked, and the pupa period was 17 days. Tea gardens near the hills, weeds, and wasteland are heavily damaged.
Prevention methods (1) Manually kill at the peak of adult emergence. The vibrancy of the tea tree occurs at the age of the adult, and the plastic film is used to receive the fire. (2) Using glue to kill tung oil and bonze to make a tatami paste. It is applied to the base of the trunk and is about 10 cm wide. It is stuck when it is on a tree. Coated once for a period of 2 months. (3) If necessary, spray 90% Bataan WP 1000 times solution or 50% phoxim EC 800 times solution and cotton soap 50 times solution. When spraying, the ground under the canopy must also be sprayed wet to kill the dead dead insects. (4) Care should be taken to remove weeds in tea gardens and around tea gardens, and cultivating larvae and cockroaches during larval and pupal stages.
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