Lychee butterfly Deudorix epijarbas Moore, genus Lepidoptera, Grey butterfly family.
【Host】Fruit trees such as lychee and longan.
【Harmful】The larvae moth eat the fruit core, the moth hole is nearly round, the proximal edge is smooth, the moth hole is not attached to the worm dung, the moth hole is more downward, and the damaged fruit does not fall off after drying.
【Morphological characteristics】 Adult female adults have grayish brown front and back wings and white hindwing margins; male adults have red bases of their forewings, leading edges and outer margins, the base and leading edges of their hindwings are black, and the rest are red; females and males have a rounded protrusion at the hip angle of the hindwings, with a round black spot on it, yellow around them, and a blackish brown periphery. The ovoid is round, the base surface is flat, the apical center is slightly concave, and the surface of the egg shell is polygonal. The larvae are oblate cylindrical, stubby, purple-gray-yellow, 16 mm long at the end of their age, with a small head, indented into the thorax, and protruding when feeding. Pupa is short cylindrical, purple-black on the back, with brown spots, and a column of coarse hairs on the top of the head.
【Living habits】Fujian occurs 3 generations a year, the first generation of larvae is harmful to lychee fruit from May to June, and the second and third generations of larvae are harmful to longan fruits from June to August. The first generation in Guangdong and Guangxi is harmful to the flower ears of early ripening lychees, and the second and third generations of larvae are harmful to young fruits in June and July in addition to the late-ripening lychees in the middle and late ripening. The larval moth-eating core often uses the hip plate to hold the borer hole, and the insect feces fall directly from the orifice, and the damaged fruit surface is free of insect feces. There is a habit of nocturnal fruit turning, and a larva can moth 2 to 3 fruits in a lifetime. When the fruit grows until the flesh is wrapped in cores, it is no longer harmful, so the damaged fruit generally does not fall off. Old ripe larvae crawl out of the fruit and pupate in cracks in the epidermis of the trunk.
【Control method】(1) Remove the insect fruit and hook the pupae at the crack in the bark. (2) Spray 10 days after the flower, and spray again every 15 days. Agent options: 80% dichlorvos emulsion, 90% dichlorvos crystal 800 to 1000 times liquid, 4.5% high efficiency cypermethrin emulsion, 2.5% kung fu emulsion 1000 to 1500 times liquid, etc.