Sweetpotato nymphs belong to the family Hemipteranidae and are distributed in North China, East China and Southwest China. The worm originally harmed crops such as sweet potatoes, soybeans, and corn. In recent years, it has caused a great deal of damage to turfgrass, white clover and other garden plants, seriously affecting the landscape effect of afforestation and beautification.
Harmful characteristics of sweet potato nymphs adult nymphs, nymphs sucking turfgrass and white stalks of the sap, the formation of a pale spot in the victim, even when a serious pale. Occasionally, there are 200 to 300 insects per square meter, the damage rate of the leaves is generally above 80%, and the severe area is up to 100%, causing the plant to wither and die and affecting its ornamental value.
Occurrence: Four to five generations a year in North China, overlapped by generations, wintering in the host's fallen leaves or weeds. The wintering eggs begin to hatch in the middle and early May of the following year. Sweetpotato pupa is weak in phototaxis, suitable for living in a cool and cool environment, and is resistant to high temperature. Adults can eclosion day and night, when the body is freshly reddish, it becomes black. The female lays the egg obliquely into the host tissue, leaves only the egg cover on the surface, and is often covered with black excrement after delivery. The egg period is generally 20 days. Eggs are often produced on the back of the leaves. Late autumn is often produced on petiole and stems, and common to 3 to 5 grains arranged in rows. The newly hatched nymphs live in groups and feed on the lower leaves of the plants and gradually disperse as their age grows. Adults and nymphs are mostly feeding on leaves, avoiding leaves on rainy days, and fleeing to the back of a leaf or jumping about 1 meter after being frightened. In October, it began to winter over eggs.
Control methods
1. Remove turfgrass and weeds near white clover.
2. Litters and weeds are removed during the wintering period, and burned to eliminate overwintering eggs.
3. In adult and nymphal stages, 6% imidacloprid EC 3,000 to 4000 times, 5% acetamiprid EC 6,000 to 7000 times, 1.2% niacin EC 800 to 1000 times, and 50% phoxim EC can be used. 800-1000 times liquid, 2.5% deltamethrin EC 3000-3500 times, 2.5% kungfu EC 3000-3500 times and other chemical pesticides, alternating use, spray every 7-10 days, even spray 2 or 3 times, Good control effect.
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