Also known as pear nets, pear nets, flowers are Hemiptera, Meliaceae. Distributed throughout the country. With nymphs, adults harm azalea, rose, camellia, smiling, jasmine, waxy plum, wisteria and other potted plants.
Injured adults and nymphs are clustered on the back of the leaf to suck juice, and the back of the victim leaf appears as a black viscous material that is splattered. This feature is easily distinguishable from other sucking pests. The entire back of the victim's leaf was rust-yellow, with many pale spots on the front. When the damage was severe, the spots became patchy and the entire leaf was chlorotic. From afar, the leaves were pale, falling ahead of time, and no longer formed flower buds.
Morphological characteristics Adult body length is about 3.5 mm, flat shape, dark brown. Antenna filamentous, 4 knots. The center of the thoracodorsal plate is longitudinally bulging and extends backwards into leafy protrusions, and both sides of the chest protrude outwardly into feathers. The forewings are slightly rectangular. Both the forewings, the anterior chest, and the dorsal lobule have a uniform reticular pattern. At rest, the forewings are folded up and face the entire body from top to bottom, resembling an "X" shape made up of multiple wings.
The egg is long and oval, with one end bent and lengthened. 0.6 mm, pale green at the time of first production, translucent, pale yellow afterwards.
The nymphs were milky white at the time of hatching, and they were dark brown after aging. They were about 1.9 mm long. At the third instar, the wing buds were obvious and the shape resembled adults. There were obvious cone-like spikes on both sides of the frontal, mid-thoracic and abdomen sections 3-8.
Life history and habits occur one generation at a time in the 4-5 generations in the Yangtze River Valley and 3-4 in the North China region. Adults live in the branches, fallen leaves, weeds, cracks in the bark, and cracks in soils and rocks. In mid-April, the overwintering adults started their activities, focusing on feeding and spawning on the leaves. The eggs are produced in the leaf tissue with yellow-brown gelatine on the top and the egg is about half a month old. Most clusters of newly hatched nymphs are endangered on both sides of the main vein. The nymphs were broken five times and became adults after about half a month. The first generation of adults occurs in early June, and each generation later in July, early August, early August and early September, due to a long adult period, a long spawning period, and overlapping generations, each of which often exists. The most serious damage is in July-August, with the highest population density in September and wintering after late October. Adults like to be active at noon. The fecundity of each female adult varies from host to host, ranging from tens to hundreds of grains, and the eggs are divided into sub-populations, with constant grain to several tens of grains adjacent to each other. There are 1 outside spawning sites. The center is slightly sunken black spots.
Prevention and control methods In the winter, potted plants and leaves around the bonsai garden are completely removed. Chemicals control Plants with coarse and coarse stems and whitewashing agents. It is the most favorable time for chemical control to control the stage of wintering adult worms and incubating first nymphs. Can be sprayed with 50% Caesarean Pine 1000-fold, or 40% omethoate 1000-1500-fold, or 10-20% pyrethroids 1000-2000-fold, sprayed every 10-15 days, continuously Spray 2-3 times.
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