The scientific name Porthesia scintillans (Walker) belongs to the order Lepidoptera, genus Moth. Synonyms Euproctis scintillansWalker. Alias ​​brown night yellow tussock moth, brown spotted tussock moth. Distribution of Fujian, Taiwan, Guangdong, Guangxi, Sichuan, Yunnan, Jiangsu and other provinces.
Host tea, cotton, cowpea, peanut, kudzu, loofah, pepper, kidney bean, sunflower, sweet potato, corn, orange, pear, peach, sugarcane, etc.
The larvae damage the leaves, pods, and fruits. In severe cases, the leaves only have reticulate veins. The pods and fruits are nicks or holes, affecting yield and quality. Morphological characteristics of adult male moth body length 9-12mm, wingspan 20-26mm; female body length 17-19mm, wingspan 26-38mm. The head and neck plate are orange-yellow, yellowish-brown in the chest, and brownish in the abdomen, and the tufts are orange-yellow. The forewings have a purplish-brown microstrip purple flash with yellow inner and outer lines, yellow lemons on the leading edge, outer edge and margins, and the yawning part of the outer and marginal yellow portions is separated into three segments; the hind wings are light yellow and the body is pale yellow. Egg yellow, hemispherical, each egg has 6-25 capsules. The last instar larvae were 17-25 mm in length, with dark brown heads and dark brown chests and abdomen. The top lines of the thorax, middle chest, and 3-7th and 9th belly were yellow, with red lines running through the middle and red lines on the back. The anterior thoracic tumor is red, and the abdomen of the first, second, and eighth abdominal segments has short tufts of hairballs, black, and black to light brown. There is also a pair of red hairy protrusions on the back of the chest, and black hairs on the body's hairy tumors.蛹 brown, hidden in a brown casket.
Living habits occur in all southern provinces. Fujian is born 3 to 4 years old. The larvae overwinter between the host leaves; Guangzhou has more than 10 generations in the year and no overwintering phenomenon. Feathering in the evening or at night, adults emerge at night, live in the back of the leaves during the day, and occur in large numbers from June to July. Female adult moths spawn on the back of the leaves, eggs are hemispherical, yellow blocks, and covered with yellow hairs. Each female can lay eggs. 40-84 capsules, egg period 5-10 days. The newly hatched larvae have clusters, and the lower surface of the leaves and leaves of the larvae are infested. After the third instar, the larvae disperse into the holes. The larval stage is 15 to 20 days. The larvae of the last instar larvae adhere to the deciduous leaves of the cultivars. , 蛹 5-10 days. The larvae have natural enemies such as urchins and small bees.
Control methods (1) Remove debris from field stubs in time and concentrate or burn them deeply. (2) Proper close planting to make the fields airy and transparent can reduce the damage. (3) Controlling the spraying of 25% diflubenzuron 3x suspension 500-600 times solution or 50% caofficloin EC 1000x before 3rd instar, 20% bacterial insecticide 1000x, and 20% extinguishment Emulsifiable concentrate 2000-3000 times, 10% more than 1000 times suspension liquid 1000 times, 50% phoxim EC 10 000 times, 10% imidacloprid wettable powder 1500 times, 20% methomyl EC 1500-2000 times.
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