Scientific name Lvela ochropoda (Eversmann) Lepidoptera, viperidae. Alias ​​榆 yellow foot tussock moth. Distribution of North China, Northeast, Northwest, Jiangxi, Sichuan, Shandong, Henan, Shaanxi, Hubei, Gansu and other provinces.
Host eucalyptus, willow.
Characteristics of the larvae The larvae feed on the leaf flesh and cause the victim to appear as a grayish white transparent mesh, after encroaching on the entire leaf, severely eating the leaves.
Morphological characteristics Adult body length of about 12mm, wingspan about 24-40mm, body, wing white, dry white tentacles, foot festival and fiscal orange. The stems are short, cylindrical and pointed. Egg length 0.8mm, oval, grayish yellow, gray and black surface covered with secretions, string arrangement. The last instar larvae have a body length of about 25-35 mm and are light yellow-green in color and gray in the head. The back of each section had white tufts of hair. The base of the tumour was black on all sides, and there were large black hairy clumps on the belly 1 and 2 sections. The dragonfly is 15mm long, light green and has dark brown hairs on the top of the head. The ventral surface is grayish blue and compound eye is red-brown.
Living habits Beijing and Shanxi have been born for 2 generations, and the young larvae have wintered at the cracks in the bark seams or nearby buildings. In mid-April of the following year, when the money was first opened, activities began. In mid-June, silkworms were used for the purpose of cocooning and phlegming in the ground. In the middle of June, 15-20 days, and in early July, adults emerged. In the middle and late July, the first-generation larvae hatched and in late August, the larvae were eliminated. In early September, the adult larvae of the first generation were born. Many eggs were produced on the back or branches of the leaves and arranged in bunches. In the middle and late September, two generations of larvae hatched and infested. In early October, larvae drilled into the bark joints to overwinter. Adults have phototaxis.
Prevention and control methods (1) In the June and August-September period of adulthood, blacklights were trapped to kill adults. (2) Severe areas occurred in late May and early June and early July and early middle and early July, the first and second generations of larvae were sprayed with 20% of young priming clothes, 1000 times of the suspension, and 50% of phoxim EC 1000-1500. Times of liquid, 20% chrysanthemum EC 2000 times, 2; 5% EC 2500 times.
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