Coccus hesperidum Linnaeus, also known as soft borer, brown soft wax bug, crooked brown soft bug. It belongs to the order Homoptera, Waxworm family.
【Host】Citrus, lychee, longan, banana and other fruit trees.
[Pesty] Nymphs and female adults like to cluster on both sides of the main veins on the front of the leaf, on the petiole, and on the young shoots, sucking the juice. In severe cases, the branches and leaves are covered with insect bodies, causing the flowers and leaves to wither and yellow, and fall off early. It can also induce soot disease, causing the branches and leaves to turn black.
【Morphological characteristics】 Adult female adult body flat or slightly raised on the back, oval, 3 to 4 mm long; asymmetrical on both sides of the body, slightly curved to one side, the color of the back of the body varies greatly, usually there are light yellow-brown, olive green, yellow, brown, reddish brown, etc.; the anterior membrane is slightly hardened, there is a longitudinal ridge bulge in the center of the body, greenish brown, dark brown around the bulge, the edge is shallow, thinner, greenish brown, the back of the body has two brown network-like transverse bands, and has various patterns; antennae 7 to 8 segments. The eggs are oblong, flattened, pale yellow. Nymphs The body of the hatching nymph is oblong, flattened, pale yellowish brown, and about 1 mm long.
【Life Habits】Generations vary from place to place, generally 2 to 5 generations a year. Female adults or nymphs overwinter on stems and leaves as fertilized females. The first generation of nymphs hatched in mid-to-late May, the second generation of nymphs occurred in mid-to-late July, and the third generation of nymphs appeared in early October. Nymphs mostly parasitize at the base of stems and leaves.
【Prevention and control methods】Refer to the first section of the first chapter on the control of the arrow-pointed silkworm. (1) Prune insect branches, shade branches, and dry dead branches to concentrate on incineration, reduce the source of insects, and improve the ventilation and light transmission conditions of citrus orchards. (2) The main natural enemies of the yashotse are the whole-breasted oligopod ladybird, the Hubei red-spotted lip ladybird, the yastic tip aphid wasp, the flower horn aphid wasp and the golden aphid wasp, the Japanese square head beetle and the parasitic red mold. It should be protected and utilized. (3) From the middle of April, often check the spring shoots of the year or the branches and leaves of the previous year' autumn shoots, when the swimming young clams appear, they should be sprayed within 5 days for prevention and control, and the agent can be selected: 48% chlorpyrifos emulsion 1000 to 1200 times liquid, 40% phosphate emulsion 800 to 1000 times liquid, 25% thiazide (chlorpyrifolidine, Urade) wettable powder 1500 times liquid, sprayed again once every 15 to 20 days, twice consecutively. During the winter garden clearing period and before the germination of spring buds, 45% sodium terpine soluble powder can be sprayed with 80 to 100 times liquid.