Camphor round shield worm Pseudaonid duplex cockerell, also known as camphor net shield ant, snake-eyed gluten net shield bug. It belongs to the order Homoptera, The Shield Podidae.
【Host】Dragon fruit, red orange, sweet orange, grapefruit, persimmon, grape, fig and other fruit trees and camphor and rhododendron, laughing and other horticultural plants.
【Pest-like】Adult and nymph parasitize on both sides of the main veins of the leaves of woody plants and on the young shoots and petiole bases, dragon fruit parasitizes on fleshy stems, sucks juice as a pest, and the growth of the affected plants is weakened.
【Morphological characteristics】 Adult female shell, nearly round, 3 to 3.2 mm long, 2.8 to 3 mm wide, quite similar to mussel shell, dark purple, 2 shell points, shell point slightly off one side, slightly with dots and wheel patterns; female adults, 1.8 to 2 mm long, 1.2 to 1.4 mm wide, purple-brown insect body; male shell, oblong oval, shell point in the middle of one end, no concentric wheel pattern; male adult body length 1.2 to 1.5 mm, antennae 10 segments, pale yellow, purple body, transparent wings, with purple flash. Ovate, lilac-red, bright egg shell. Larvae The body of the hatching larvae is flat, oval, lilac-red, and gradually becomes round after fixation. Pupae Male pupae are nude pupae with a lilac color.
【Living habits】 Guangdong occurs 2 generations a year, with nymphs or fertilized female adults overwintering on the branches. Activities, feeding, and spawning begin in early to mid-April of the following year. The hatching nymphs crawl for 1 to 2 days, find the appropriate part, and fix feeding. The propagation and spread accelerates from May to June and blooms from September to October, and poorly managed orchards are easy to find.
【Prevention and control methods】 Refer to the first section of the first chapter of the brown roundworm control. (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.