The pear borer, also known as the pear-winged moth, is commonly known as "pear big" and "hanging ghost". It belongs to Lepidoptera. The moth family is the main pest of pear trees. China's pear production areas are widespread. The larvae feed on buds, flower clusters, leaf clusters, and fruits, and invade from the base of the bud when infested, causing the buds to die. After fruiting period in young fruit period, the common wire is used to wrap the fruit on the shoots, the inward hole is larger, the insect excrement is outside the hole, the handle and branches of the victim fruit are detached, but the fruit does not fall.
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Morphological characteristics The larvae are dark red or dark green. The mature larvae are 17 to 20 mm in length and the head and the front thoracic scutellum are brown. The crotch is covered with dark, granular dots with a light cyan belly. Adult body length 10 to 12 mm, wingspan 24 to 26 mm, body dark gray, compound eye black, front wing with a purple luster, there are 2 gray horizontal stripes, grayish white hind wings. The first egg lays yellowish-white, then turns reddish-brown, about 1 mm long, and slightly oval in shape. The carcass is about 12 mm long, thick and short, brownish green at first, and later turned yellow-brown.
The life history and habits of P. grandiflora occurred in the Northeast in 1 generation each year, occurred in 2 generations in 1 year in North China, and in 2 to 3 generations in Huazhong area, both larvae survived in winter. In the season of flower buds, the buds are invaded during the expansion period and the fruits are damaged during the young fruit period. The larvae invade from the base of the bud to harm the buds and cause damage to the fruit from the top of the young fruit. After the larvae are matured, the larvae become larvae in the last-damaged fruit. Before the larvae are pupa, the emergence hole is used. The pupa period is 8 to 11 days. The eclosion period is between the 1st generation and the 7th month. The 2nd generation area is between the middle and late July and July. In the middle. Taking the 2nd generation zone as an example, the first generation of larvae was infested from June to August, the second generation of adults was from August to September, the second generation spawned around the buds, and the hatched larvae spread into the buds during the winter.
Control method?
1. Shoot buds Kill the larvae.
2, the chemical control of overwintering larvae out of the pod buds, is also a critical period of prevention and treatment, the choice of agents and concentrations: 50% parathion 1000 to 1500 times, 20% cypermethrin 1500 times, 20% enemy Chrysanthemum 1000 to 1500 times, 40% water phosphathiothite 1000 to 1500 times, 2.5% enemies 1500 to 2000 times, 2.5% deltamethrin 1500 to 2000 times, 25% diflubenzuron 3 2000 to 2500 times liquid, 20% diflubenzuron 4000 to 6000 times liquid, 35% Saitan 2000 times liquid, 1.8% afu insect clear 2500 to 3000 times liquid and other agents. The above pesticides are used alternately in the adult stage.
3, fruit transfer period and the first generation of larvae during the removal of fruit.
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