First, the hazard characteristics of female adults in the shoots on the continuous acupuncture points spawning, arranged in an irregular spiral, so that the branches of the subcutaneous xylem slash-shaped cracks, resulting in the upper branches of dry. Second, the morphological characteristics Adult body length 40 to 48 mm, black, shiny. There are yellow-brown patches on the front edge and the forehead of the head. Before and after the wings are transparent. Male cymbals. The females have no whistles and the ovipositors are obvious. Eggs produced by females are oblong, about 22.5 mm long, milky white and shiny. The nymphs are yellow-brown, with winged buds that can crawl. Third, living habits occur in 4 to 5 years. Eggs and nymphs live in the injured branches and in the soil. From July to August, the females first sucked the sap from the trees, supplemented with nutrients, and laid eggs. It took 15 to 20 days from the emergence to spawning. Choosing spawning and spawning, the ovipositor is used to puncture the bark at the time of spawning, then the eggs are produced in the xylem, and the spawning holes are arranged in a long string. There are 5 to 8 eggs in each egg hole. The shoot above the egg site will soon wither. The eggs in the dry branches must fall on the wet ground to hatch. Nymphs climbed into the soil after climbing for 10 minutes on the ground, and sucked up roots of the plants to produce nutrients. Nymphs are more than 10 to 30 centimeters deep in the ground, reaching a maximum depth of 90 centimeters. Fourth, prevention and control methods (a) cut away tip. The fall cuts off spawning shoots, prunes in winter, thoroughly cuts the net spawning sticks, and burns them centrally. (b) trapping adults. During the adult stage, the trees are ignited in the evening and the trunk is shaken. Adults will set themselves on fire. (c) Stop nymphs from getting on trees. Before the emergence of adults, a plastic film with a width of 3 to 4 cm was tied in the trunk to intercept the nymphs that emerged from the excavated trees. They were captured in the evening or early morning.
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