Scientific name Platypus sp. Coleoptera, long and small. Alias ​​mountain worm. Distributed in Shanxi.
Hosts hawthorn, persimmon.
Characteristics of damage Adult worms and larvae feed on the xylem of mature trees, causing criss-crossing tunnels. When severe, they reach the root depth and affect the tree vigor.
Morphological characteristics Adult females are 5.5-6 mm long and 1.8 mm wide. They are slightly smaller and have a long, tubular, dark brown color. Short head width; compound eye black nearly spherical, tentacles hammer; 6 knots. The chest is rectangular, with a first width. Coleoptera nearly rectangular, with 8 longitudinal points, forming a ridge; front and 1/3 of the wing tip with fine hair, dorsal view of the elytra end slightly round, male slightly concave. The abdomen is short and the web is 5 knots. Forefoot and midfoot are quite close together. The back of the chest is long, the back of the chest is 2 to 2.5 times the length of the abdomen, resulting in the rear foot like birth at the end of the body. Hip plate slightly exposed outside the elytra wing. The legs are broad and broad, with 4 knots and 2 claws. Egg oval, long diameter 0.6mm, short diameter 0.4mm, white to milky white. The larvae have a body length of 5-6 mm, and the internodes curl slightly, and they have no feet and body fat. The head is pale yellow and the mouthpart is dark brown. The sacral section is milky in white, and the forequarters are thicker and narrower. The chest shield is light yellow, and the anterior thoracic plate is ossified, pale yellow dense and short hairy, and the abdomen distal to the ventral surface has a pale yellow-brown tubercle. Valve 9 pairs. The dragonfly is 5-6mm long, long-barreled, milky to brown. (Figure left)
Habits of life 2 generations in Shanxi, you can overwinter winter, but the larvae mainly. The activity began in mid-March, and the occurrence period was irregular. There were three peak periods in adult emergence: from the end of April to early May; from mid-July to early August; from the end of September to the beginning of January. From mid-July to early August, the largest amount occurred and the longest duration. It consisted of adult worms that emerged from overwintering larvae and one-generation adult worms. It was a period of dispersal and invasion of new trees. In mid-November, when the temperature is o°C, they all enter the wintering state. The duration of non-overwintering insects: 50-60 days for adults, 23-28 days for larvae, 15-20 days for flood, and 22-27 days for eggs. After the adult emerges from the tree, it flies around the tree or crawls along the trunk. It has a feign death. Adults mostly invaded from the tree trunk longitudinal dead skin corrugation groove, boring hole diameter of about 1.5mm, round, horizontal and vertical tunnel ramp down, can be to the root. At the end of the tunnel, there is usually a slightly enlarged egg chamber with 15-20 eggs per chamber. The newly-incubated larvae are nearly triangular and become normally normal larvae after 14-16 days of molting. They are then matured for 9-12 days, and their respective diverticul- sifications are performed.
Prevention methods (1) Strengthen comprehensive management and increase tree vigor to reduce occurrence. (2) The adult tree is sprayed with a high concentration of contact poison to spray the trunk into the rinsing state, and the adult poisoning effect is very good. The use of chrysanthemums such as enemy kills, kung fu, extermination, rapid killing, Uranus, cypermethrin, etc., or commonly used organophosphorus pesticides such as dimethoate, icas, malathion, etc., are all 2000 times. Mixtures or their formulations have good results. It has a cure for branchworms such as Giardia.
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