How to prevent pear stem bees?

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China's pear areas are generally endangered and are important pests that harm the new shoots of pear trees. The rate of serious shoots in the new shoots of pears has been as high as 90%. Adults lay their eggs in the newly formed xylem, and the new shoots on the spawning point break about 3-4 mm. After hatching, the larvae feed on the new shoots downwards, resulting in dead parts. The saplings are the most harmful to the pruning period, and they can affect the tree forming and crown expansion in severe cases. In the first year of its development in the North China pear area, the mature larvae and cockroaches pass winter in their biennial branches. In mid-March, the pupae ephemerate when they bloom. About 10 days after flowering, the rapid growth period of new shoots is the peak of their spawning period. After the eggs hatch, the larvae feed on the xylem of the new shoot and leave only the cortex. In general, in late May, the two-year-old shoots can be picked up, and a slightly curved long oval-shaped worm room can be found in the biennial branch. In early August, the larvae were old and began to live for the winter.

Prevention methods: (1) Agricultural control: In winter, the dead branches formed by the damage are cut off, and the damaged shoots are cut off early in the spring and destroyed to reduce the number of insects in the second year. (2) Biological control: The two parasitic wasps of Pyrus sinensis and Pyrus sinensis can be used. The method is to select the pear stem bee to harm the branches, placed in the rearing box, in the following year the pears fall and the parasitized bees are put into the pear orchard. (3) Chemical control: The main purpose of chemical control is to eliminate adult worms. It should be used during the eutrophic period of adult overwintering in that year. However, the flowering season is generally positive. In order not to affect the fruit setting, the spraying time may be earlier than before flowering or delayed until flowering. At the same time, in order to increase the effectiveness of prevention and control, Chengfang's contiguous production areas should use drugs at the same time to achieve the purpose of “group prevention and treatment”. Chomomile, cypermethrin, deltamethrin and other agents can be used.

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