Pyramids are commonly known as worms, truncations, hymenoptera, and stem bees. They are widely distributed in various pear regions in China and are one of the major pests of pears. They are often found in heavy orchards where management is extensive. How to prevent the harm of pear bee-stem bee, bud of bud of Northwest Agriculture and Forestry University Plant Protection College for the majority of farmers.
Harmful symptoms
The larvae of spawning beetles infested young shoots and upper petioles when they were spawning. The affected shoots and leaves wilted after being affected, and fell off within a few days, forming short branches. The larvae feed on the lower part of the branch and become black and dry. After the tree was killed, it affected the tree vigor and yield. After the young tree was killed, it seriously affected the growth of branches and the expansion and shaping of the canopy.
Morphological characteristics
The eggs of pear stem bees are oblong, about 1 mm long, milky white and translucent. The dragonfly is 7-10 mm long, with a milky white color and a black gradient. The mature larvae have a body length of 8-11 mm, a slightly flat body shape, a white gradient with a pale yellow color at the beginning of hatching, a brownish-brown head, a curved head and chest, and an upwardly curled tail, showing a "-" shape. The chest is extremely small and has no abdominal foot. Adult body 7-10 mm long, black, shiny. Antenna filamentous, black. The rear ends of the mouthparts, both sides of the posterior edge of the prosthodontic plate, the mid-thoracic plate, the posterior chest, and the posterior thoracodorsal plate are all yellow. There are whitish ovipositors in the abdomen of females.
Habits
The pear-stem bees occurred one generation in one year. The mature larvae lived in the shoots or in the two-year-old shoot pith as white storks. In March of the following year, the adult eclosion will occur from late March to mid-April. Adults emerged after 3-6 days of emergence before they bite a round feathering hole. Adults like to do activities, copulation, and spawning when the weather is high around noon, and in the back of the lower canopy of the tree canopy in the morning, evening, and night. Before spawning, the adults first saw the young shoots from 4 to 5 leaves with a sawed ovipositor, then spawned in the tender tissue 2-3 mm below the wound, and the petiole at the lower part of the fracture after spawning. As soon as a saw is cut, a female can infest 20 to 30 shoots and the period of egg is 7-10 days. After hatching, the larvae feed on the underside of the branches, and the damaged shoots are gradually black and dry and filled with insect feces. From June to July, he enters the two-year pith or continues to stay in the annual branches. He is turned to the body, head down, head up and stop feeding. From September to October, the larvae are mature and do the wintering.
Control methods
In mid-April, after the spawning of pear bee larvae was completed, the trees were carefully inspected, and the damaged shoots were promptly removed and cut off at 1 cm to eliminate the eggs produced.
During the flowering period of pears, the adults gather and are easy to find. Using the characteristics of the habitat where the adults inhabit at the lower part of the canopy at early and late temperatures, they shake off adults and concentrate on killing.
Using the characteristics of the pear stem bee tending to be yellow, the pear bee larvae hang a yellow trap board in the pear orchard to kill a large number of adults.
Occurrence of large amounts, serious damage to the year and the orchard, in the pear shoots up to 5 cm to 6 cm spray 80% dichlorvos 1000 times to kill the adult.
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