The pear stem bee is commonly known as the twig worm, pruning worm, and head cutting worm. It belongs to the Hymenoptera order and the Stem Bee family. Distributed in various pear producing areas in China, it is one of the main pests of pear trees, causing stiff and falling fruits, reducing yield. So how to prevent and control the harm of pear stem bees?
Harmful characteristics of pear stem bees
When the adult pear stem bee lays eggs, it uses a saw-shaped ovipositor to damage the tender shoots and petioles on the shoots. After being damaged, the affected shoots and leaves wither and droop, withering and falling off within a few days, forming short branch piles. The larvae feed on the lower part of the branch stump, and the eaten part turns black and dry. After the damage of large trees, it affects their vigor and yield, while after the damage of young trees, it seriously affects the growth of branches and the expansion and shaping of tree crowns.
Prevention and Control Methods of Pear Stem Bee
1. Artificial prevention and control
After the pear tree falls, manually cut off the branches that have been eaten by pear stem bees within 15 days after the fall, and centrally destroy the cut branches; In addition, when winter comes, the winter pruning work of pear trees should also be combined. Any damaged branches and pegs found during winter pruning should be promptly cut off and uniformly burned.
2. Chemical prevention and control
The occurrence period of adult pear stem wasps, also known as the separation period of pear tree flocs, is when spraying once. When the pear tree enters the flowering period, spraying once again can effectively prevent and control pear stem wasp pests.
When choosing a medication, the following medications can be used: chlorpyrifos emulsifiable concentrate or chlorpyrifos wettable powder, etc.
