Pear stem bee
Pyramid bee, also known as Falconidae, truncated worms, etc., is Hymenoptera, Stembee family. In China's pear-producing areas, this insect is responsible for damage. The rate of damage to new shoots in severe areas is 80% to 90%, and it is mainly responsible for pears. Adults lay eggs in the newly formed xylem of tender shoots. From the point of spawning, about 3 to 10 millimeters, the spring shoots are turned off. The larvae are taken down inside Xiao, causing the victim to die and form a dark brown dry cocoon. It is an important pest that harms the spring shoots of pear trees and affects young tree shaping and canopy.
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Morphological characteristics Adult body length of about 10 mm, black body with a shiny, transparent wings, yellow feet. The tentacles are blackish and the females have a whitish ovipositor. Larvae body length 10 to 11 mm, milky white or yellow-white, light brown head, slightly flat body, chest dense, upside by end. White translucent, oblong, slightly curved. Slender, colostrum white, mediocre. Black eyes.
The life history and habits of pear stem bees occur one generation in one year, and mature larvae and thorium ore ~ ​​leaves 7 are called: overwintering in branches, phlegm in the middle and middle of March, eclosion when the pears blossom, and adulthood when the flowers grow. Spawning, 10 days after flowering, a large amount of oil emerges into the spawning period. After hatching, the larvae feed to the plant and eat the young xylem and leave the cortex. When they eat, they pull the excrement and fill the empty tip until late May. By the end of the second year of the cattle school, all students had entered the two-year school in June, and the long oval-shaped worms were slightly curved. In August, the old man stopped feeding, and he began to sleep for the winter.
Control methods
1 In winter, the litter damaged by the larvae is cut off. After the spring adult lays eggs, the shoots are cut to kill the eggs or larvae.
2 Chemical control during the adult stage. The agent and concentration can be used: 2.5% kiprosterol 1500-2000 times, 20% cyproterone 1500-2000 times, 2.5% deltamethrin 1500-2000 times, 80 % Dichlorvos 1000 to 1500 times organic organophosphorus or pyrethroid pesticides. Results The big tree was at the flowering stage, and it could be sprayed before flowering and just after flowering, and it was applied to flowering period of late flowering small pear trees and pears. 
