Control of longicorn beetles planted with mango

Distribution and harm occur both at home and abroad, and in Yunnan, Guangdong, Guangxi, Fujian and other places in China. The larvae drill into the branches of mango, cashew and other fruit trees, usually invade from the young branches, and gradually eat down to the big branches and tree trunks, which seriously affect the growth potential of the plant and eventually lead to the death of the whole plant.

Morphologically, the adult is about 33 mm long and 8 mm wide, maroon or chestnut black, narrow and long, parallel on both sides, between the antennae, dense golden villi around the compound eyes and on the top of the head, long antennae, about 1mm 2mm 3pm 4, the forechest dorsal plate has 19 raised longitudinal ridges, and the deep grooves between the longitudinal ridges are clustered with yellowish villi. The surface of the sheath wing is densely dotted, and the base is thicker and densely wrinkled. In addition to short gray-white hairs, there are long markings composed of golden hairs, which are arranged in five vertical rows, and the ventral surface and feet of the body are densely covered with gray or gray-brown villi.

Life habits occur once a year, adults occur from April to July, and a large number of adults occur in May and June. Adults often lay eggs in the cracks or cracks near the end of the young branches, one at a time, and the hatched larvae feed on the pulp of the branches. the tunnel is simple, up and down into a cylinder, and there is often a white gelatinous substance gathering at the end of the tunnel. The vibrating branch larvae can move up or down quickly, and there is a defecation hole at a certain distance from the outside of the damaged branches. The viscous black liquid of insect feces is excreted through the defecation hole, which is a significant sign of the harm of this insect.

After maturing, the larvae pupate in the tunnel, and after Eclosion, the pupae stay in the pupa chamber for a period of time before wide fecal holes, go out, eat young branches, buds, tender shoot skin as supplementary nutrition, mating and spawning.

Prevention and cure measures

1. Clean orchard in winter and spring combined with orchard pruning, cut off the damaged branches and concentrate on burning.

two。 The adults are artificially killed and the adults are just feathered. In the stage of supplementary nutrition, it is easy to catch them manually.

3. The canopy spray was poisoned by spraying in the stage of supplementary nutrition and feeding of adults. You can choose some low-toxic pesticide spray. Such as: 25% or 30% Jule mixture EC 1500 / 2000 times, or 20% Guofengling wettable powder 800 / 1000 times or 30% Chlorfenac EC 1000 / 1500 times. If one of the above pesticides is used alternately, the adult worm will be sprayed once in 7-10 days, and it can be sprayed 2-3 times in a row.

4. For wormhole injection, 40% dimethoate EC 50 times, or 2.5% deltamethrin EC 200 times, or 80% dichlorvos EC 100 times, use a syringe to inject the solution directly into the wormhole or dip it into the wormhole with skimmed cotton, and then plug the hole with wet mud. Note: before taking medicine, choose the hole discharged by fresh insect faeces to inject medicine or plug cotton. Then all the defecation holes of the whole tree are blocked with wet mud to facilitate pesticide fumigation of larvae in the insect path.