The scientific name is Dendrolimus punctatus Walker, Lepidoptera. Alias ​​pine caterpillar. Distributed in Henan, Shaanxi, Jiangsu, Anhui, Hunan, Hubei, Jiangxi, Zhejiang, Sichuan, Yunnan, Guizhou, Fujian, Guangdong, Guangxi, Hainan, Taiwan and other places.

The host is mainly responsible for the damage of Pinus massoniana, Pinus thunbergii, Pinus taiwanensis, Pinus elliottii, Loblolly pine, etc.

Characteristics of the larvae feeding needles, often eat leaves, pine forest like fire, resulting in the death of pine forests, in recent years, low mountains and hilly areas. In addition, the insect poisonous hair touches the human body, causing redness or erosion, poisonous hair pollution of water sources, affecting human health.

Morphological characteristics of adult body length 20-35mm, female moth wings 48-80mm; male moth 38-62mm, body color yellow brown, gray brown, brown, brown and many other, body color changes. There are 4-5 dark brown horizontal lines on the forewings, 1 white point on the middle chamber, and 8-9 near-crescent dark brown patches on the sub-endline, and 3 spots on the hip angle. The color of the male moth is darker, the horizontal lines of the fore wings are darker and more distinct, the white spots on the middle chamber are distinct, and the antennae are feathery. The female moth is larger than the male moth and has a slightly lighter color. The antennae are short and dentate, and the abdomen is thicker than the male. The eggs are about 1.4mm long, oval, pink, and become dark purple when hatched. They are produced in bunches or piles on pine needles. The last instar larvae have a body length of 40-80mm. They have brown-red and brown-black colors. The head is brown-brown. There are blue and black poisonous hair bands on the back of the chest and back of the chest. There are yellow-white hairs between the two belts. In the tufts, narrow and flat lamellae, apexes with dentate projections, white long hairs on the side of the body, and a longitudinal strip running longitudinally through the body, from the mid-thoracic to the 8th abdominal valve With l white spot, the center of the body is white or golden to dark brown. The dragonfly is 20-27mm long, chestnut brown or dark reddish-brown, with yellow hairs between the nodes, slender buttocks at the end of the abdomen, and hooked curls at the ends.茧 Long oval, gray to brown. Toxic hair on the surface.

Habits of life 2 generations in Henan, the Yangtze River Valley, Anhui 2-3 generations, Guangdong, Guangxi, 3-4 generations in southern Fujian, Hainan 4-5 generations, with 3-4 larvae in the bark seam or coniferous overwintering. In March of the following year, overwintering larvae are planted on trees, and in mid- and late April, they begin to gnat and phlegm. In early May, they enter the stage of phlegm, and adults emerge in May. Adults live for 5-9 days. The first generation larvae emerged in early June, the second generation occurred in early August and the third generation larvae appeared in late September. Two of the second generation larvae began to dip in mid-August to mid-January, and normal second-generation larvae In early September, pods were larved and metamorphosed, and in the middle of the eclosion, the third generation of eggs produced was more hatched than in mid-September, and the disease was caused to begin wintering in mid-November. Adults have phototaxis, mostly spawning at night. Each female produces dozens to hundreds of eggs, and the egg period is 6-ll days. The larvae have 6 instars, l-2 instars, and are affected by drooping drooping drooping, 3-4 instars are no longer spinning, and they have bounce habits, 5- After being frightened at the age of six, he often bent his head to the lower chest and erected his chest hair. During the larval stage 34-56 days, the last-instar larvae were larvae and phlegm in the pine needles, under the bark, and on the weeds of the shrubs, and they were 11-22 days old. The insects and larvae can migrate and spread. The larvae tend to be dispersed by the colony. When the food is lacking, they migrate outward in groups and feed. Adults fly more than 0.5-2 km away. Generally in low mountains or hills below 500 meters above sea level, the tree age is about 10 years, and the degree of canopy closure is small and dry and easy to occur.

Control methods (1) To create a mixed forest to cultivate a diversity of biological communities, so that it is conducive to reproduction and survival of natural enemies. (2) Grasp the overwintering generation and later generations of 2-3 larvae spraying the 50% malathion emulsifiable concentrate 1000 times solution or 50% killer pine soluble emulsifiable concentrate 1000 times solution, 90% crystal trichlorfon 900 times solution. (3) Using 2.5% trichlorfon powder, spray 3 kg per 667m2. (4) Conditionally mix DDVP, malathione crude oil and second-line oil into 1:1:3 ultra-low-volume formulations for ultra-low volume sprays, using 100 to 150 mL per 667m2. Can also be used 2.5% 5% deltamethrin or 20% cypermethrin crude oil 1-2ml, 3000-4000 times the water on the ground for low-volume spray. (5) If necessary, ultra low-volume aerosol spraying of the above-mentioned pyrethroids 500 to 1000 times. (6) It is also possible to use 1% or 2% Velomomide aerosols, 160 mL per 667m2 dose, or 20% dichlorvos heavy smoke agent 9-10.5 kg/m2. The height of the heavy smoke cloud is 2 m. Five hours later, the smoke cloud landed on the tree. (7) In the initial stage of adult egg laying, 100,000 Trichogramma per 667m2 were released for biological control.

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