Large hook-winged ulnar moth Hyposidra talaca Walker, genus Lepidoptera, Ulla moth family.
【Host】Citrus, lychee, longan and other fruit trees.
【Harmful】The larvae are harmful to the leaves, so that the leaves are absent or only have leaf veins, and the symptoms are the same as those of the large bridge worm.
【Morphological characteristics】 Adult Female moths are dark gray-brown, with 2 russet wavy lines extending from the front edge to the posterior margin on the front fin, and the front half of the outer edge of the forewing has an arc-shaped concave, so that the apical angle is curved backwards, and the antennae are filamentous. The male moth is smaller , slightly darker , with feathery antennae. Eggs are green in the abdominal cavity and beaded. Larvae The larvae of the large hook-winged ulnar moth are similar to the larvae of the great bridge-building insect, differing in that the back of the second abdominal segment and the back of the eighth abdominal segment of the great bridge-building insect have a pair of protrusions, while the large hook-winged ulnar moth does not, but the second to seventh abdominal segments of the larvae have a white dotted horizontal stripe, and the young larvae are dark brown and have a distinct white dotted horizontal line in each abdominal segment. 3 pairs of pectoral feet, 1 pair of 6th abdominal segment feet and 1 pair of tail feet.
【Life Habits】Most of what is seen in the field is in summer and autumn, and it occurs at the same time as the large bridge building insect.
【Control method】Control with reference to the coarse shin green ruler moth. (1) Clear the garden in winter, cut off insect pest branches, control the winter shoots, block its food source, and reduce the source of overwintering insects. (2) Use adult insects to have phototropism, and use black or blue light lamps to trap them. (3) Spray control at a young age of the larvae. Optional pesticides: 4.5% high-efficiency cypermethrin emulsion 1000~1500 times liquid, 2.5% cypermethrin (enemy killing) emulsion 1000~1500 times liquid, 2.5% high-efficiency cypermethrin (kung fu) emulsion 1000 ~1500 times liquid, Thuringiensis (Bt) wettable powder or emulsion 600 to 800 times liquid, or add 10% cypermethrin emulsion, 90% dimethoate crystals 1000 ~ 1500 times liquid prevention effect is better. In areas with strong drug resistance, 1.8% avermectin microemulsion 1000 to 1500 times liquid, 2% methylamino avermectin benzoate emulsion 1500 to 2000 times liquid or 5% chlorphenoxybenzoamide suspension 1000 times liquid spray can be used.