[Harmful symptoms]
The use of nymphs and adults to suck up branches, petioles and pulp juices has a great impact on tree potential, yield and quality.
[Prevention and control methods]
(1) Adult insects can be killed in the early morning and evening, and the egg blocks and first-instar nymphs that have not dispersed as pests can be removed in time. (2) Protect and utilize natural enemies, such as lychee egg jumping wasps, lychee egg flat-bellied wasps, etc. (3) During the peak of adults and nymphs, spray 90% crystalline insects 800 times liquid or 3000-4000 times liquid of permethrin agents.
[Morphological characteristics]
Adults are 18–22 mm long and 8–11 mm wide; slightly broader , dorsal brownish brown , with a yellowish-white or yellow longitudinal ridge from the tip of the head to the middle of the small shield ; irregular fine yellow-white raised markings on the dorsal plate , small shield , and leathery part of the forewing ; sparse yellow-white spots in the middle of the posterior end , forming a large nearly circular tan-brown spot ; small yellow spots between the lateral junctions of the abdomen; black or tan of the forewings ; slightly narrower head , anterior tip , yellow-white ridges on both sides of the head ; compound eyes black ; antennae 5 segments , black , black , Filamentous, 1/3 of the base of the fifth segment, yellowish white or yellow; beak 4 segment, pale yellow, terminal segment black, dark brown beak slit; brownish black at the base of the foot, blackish brown at the end of the tarsal segment, with 1 pair of claws; and an opening of volatile odorous glands next to the base segment of the posterior foot.
[Life Habits]
Adult insects overwinter in grass or tree holes, bark cracks, under dead branches and leaves, wall crevices, and eaves, and begin to move when citrus sprouts from April to May of the following year, and spawn and harm flower vessels and young fruits, and lay eggs on the leaves. The egg stage is about 10 days, with hatching nymphs visible in mid-to-late May, the first peak in June, the feathering of adults in July and August until late autumn, and the third peak in early to mid-October, followed by overwintering. Both adults and nymphs use a tapered mouthpart to suck up plant sap. Adults are highly flying, prefer to move in the upper parts of the tree, have pseudo-death, and secrete odorous liquid when disturbed.