[Harmful symptoms]
The larvae bite the new shoot leaves, causing the leaves to be missing and holes, leaving the new leaves incomplete.
[Prevention and control methods]
(1) Remove orchard weeds, especially Matang weeds and broad-leaved weeds, before the new shoots are drawn, and reduce the hiding places of adult insects. (2) Spraying organophosphorus or pyrethroid insecticides can be controlled with 5% methylvidate 1500 times, 12% carbalamin nitrile 1500 times, 5% avermectin 1500 times, 3% avi perchlorine 1000 times, 51.5% perchlorine chlorpyrifos 1500 times, etc.
[Morphological characteristics]
Adults are 15 to 17 mm long with a wingspan of 32 to 36 mm; greyish brown with a tuft of upridden hairs on the posterior margin of the thorax; dark grey forewings, light silver in the baseline and inner line, with a "U" shaped silver spot and a nearly triangular silver spot in the center of the wing; the outer line is double-line corrugated, the subfectal line is black brown, serrated, and there is a black spot in the middle of the margin hair; and the hindwings are dark brown. The ovoids are hemispherical, white to pale yellowish-green, and the ovary surface has longitudinal and transverse lattices. The larvae are pale green, about 18 mm long, the anterior part of the body is thinner, the posterior end is thicker, the dorsal line is double-lined, white, the sub-dorsal line is white, the gastropods are the first and second pairs of degenerate; the tail foot is thick. Pupae are thin , about 18 mm long , with a pale brown initial dorsal surface , pale green ventral surface , late body russet , a pair of tail spines , and a white loose silk cocoon on the outside of the pupal.
[Life Habits]
Occurs 6 to 7 generations a year to pupate overwintering. Adults are mostly active at night and have a certain degree of phototropism. The eggs are scattered on the back of the leaves. The larvae feed on the new shoot leaves in An outbreak in August, biting into missing, holes or only the main veins. Old mature larvae pupate on low plants. It often occurs in citrus nurseries with fertile, overgrown and humidity citrus nurseries and densely planted young trees.