Medicinal plant pests Pear nets
Scientific name Stephanitis nashi Esaki et Takeya Hemiptera, Meliaceae. Alias ​​pear net melt, pear army with insects. Distributed in North China, East China and Central China, the middle of our country is severe.
Hosts camellia, rose, jasmine, paste stems jellyfish, rhododendron, smiling, peach, wax plum, plum and other medicinal plants and flower Qi.
Injury characteristics, nymphs sucking juice on the back of the leaves, the front of the victim leaves a pale spot, the back of the leaves have brown spotted insect feces and secretions, so that the entire leaf back is rust yellow, and the injured leaves are falling early.
Morphological characteristics Adult body length 3.3-3.5mm, flat, dark brown. The head is small, compound eyes are dark, antennae are filiform, and the wings are covered with reticular patterns. The pronotum is bulging, extending backwards like a flat plate, covering the small scutellum, with wings on both sides. The front wings are folded and the black spots on them form an "x"-shaped dark brown spot. Worm body chest and belly dark brown, white powder. The abdomen is golden yellow with black markings. Yellowish brown. The egg is long and oval, 0.6 mm long, slightly curved, and pale yellow after the first light green. The nymphs are dark brown, their wing buds are obvious, their appearance is like adults, and their heads, chests, and abdomen have spikes.
Living habits 3-4 generations in North China, 4-5 generations of the old course of the Yellow River, adults overwintering in litter, cracks, weeds and earth and stone seams. In the following year, the adults began to move when the pear trees were spread and spawned in the tissues on both sides of the leaf veins. Eggs are tan-colored jelly-like, and the egg period is about 15 days. The nymphs clustered on both sides of the main lobe of the leaf after hatching. Generations overlap. After mid-October, adults have been searching for suitable places for winter. It is known that natural enemies have military forces, such as blind monks.
Prevention and control methods (1) In September, weeds were collected on the trunk of medicinal woody plants to trap overwintering adults. In winter, weeds and leaves were completely removed and burned in a concentrated manner, which greatly reduced the damage of insects and mitigated damages in the coming year. (2) Apply 50% malathion EC or 40% dimethoate 1000 to 1500 times solution, 50% dichlorvos EC, or 90% trichlorfon 800 to 1000 times to promptly spray the nymphs at the hatching stage and after overwintering. , 2.5% of the enemy killed (cyanhydrazide) EC or 2.5% Kung Fu EC or 20% chloramphenicol 3000 times;
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