Pear stem bees that harm pear trees

Pear stem bees belong to the order Hymenoptera, stem bees, also known as pear cut bud worms. Folding insects, with young trees suffering more heavily.

First, morphological characteristics. The adult is a small black bee. The wings are pale black and transparent. It has antennae , and the thorax and posterior part of the wing base are yellow. Foot yellow. The legs are yellowish brown. The female has a saw-shaped ovipoting tube at the end of her abdomen. Usually hidden in the abdomen, it protrudes when laying eggs.

Second, life history and habits occur once a year. It overwinters as old mature larvae on biennial dead branches. Pupates in March of the year of Kasa, in late April the adult insects appear in full bloom, the new shoots grow to 67 cm and begin to lay eggs, more than ten days after the blooming period, the harm reaches the peak period. Spawning is relatively neat. About half a month before and after. Adults love to lay their eggs in the morning on sunny days. Hide behind the leaves in the morning, evening and rainy days. Adults lay their eggs with a saw-shaped ovipoting tube protruding from the abdomen. Penetrate into the young and lay the eggs in the cortex more than one centimeter between the xylems. Sawn off with an oviduct. The egg stage is about seven days, mothing down the young branches, draining feces into the borehole, and the larvae grow into the biennial branches. Cocooning overwinters.

Third, prevention and control methods.

1. Cut off the infested insects slightly from April to May to eliminate the eggs and larvae. Combined with winter pruning, the damaged branches are cut off and burned in a concentrated manner.

2, the adult stage spray 50% dichlorvos aerosol. 800 to 1000 times liquid.