Pear stem bee, common name folding insect. It occurs in all pear regions in China. Adult spawning and larval feeding damage the shoots. When serious occurs. Manchurian's numerous shoots severely affect shoot growth and canopy enlargement. Seriously affecting the formation of young trees and adult tree branches and fruiting (after the axillary shoots were smashed. The young fruit below gradually withered), resulting in a decrease in the number of pear tree branches, slow growth of the tree, and delaying fruiting. Reduced production.
For pear stem bee control, flowering insecticides are generally used during the flowering period. Artificial catching adults, hanging sticky board kill adult. Artificially remove the tip of the shoot and kill poisonous larvae inside the tip. The control of pear stalk bee adult. When adult eclosion occurs. Artificial killing one morning and one night can have a certain effect. However, when the pear orchard area is large, the labor force is tight and it is not easy to achieve timely pest control. Two fine pear varieties were introduced in recent years to kill yellow pear beetle adults, but the shoots near the stick board were still being eaten by other parts of the beetle. Pear bee is often damaged after a period of time, the effect is compromised. Hanging sticky board requires a large area of ​​joint defense, and it can be achieved year after year to achieve better control efficiency. Pests are more serious harm to the pears, the amount of adult is larger, in the peak of adult emergence spraying pyrethroids to kill adults, but also can play a better control effect. Harm reduction. After the drug, attention should be paid to artificially assisted pollination to increase the fruit setting rate. For the control of pear larvae and larvae that have been spawned after spawning, artificial shoots have been used to remove shoots, which can have a good effect on small pears and reduce the amount of insects in the next year. However, adult pears are more difficult, due to the tall trees, cutting is not easy to complete, the next year is still a serious hazard, but also need to join the film and the park to prevent joint cut, one does not cut the entire film. I previously used omethoate to kill eggs and larvae of pear stem bee worms, which was completely clean and good for one year. After that, the damage was light in the following years. However, because omethoate is a highly toxic pesticide, it has been banned in fruit trees. For many years, it has not found a substitute for omethoate, and artificial insect trapping is used alone. With a large amount of work, the effect is not very good, and the hazards of pear stem bee increase year by year.
In 2010, when my field used the neonicotinoid insecticide acetamiprid to control pear birch, it was found that the larvae of the larvae in the pods gradually stopped developing and died of atrophy (the same type of insecticide imidacloprid did not have this effect). ). After my flowering in the pear field in 2011, I used the second round of medicine (about 20 days after flowering) and used the 20% acetamiprid powder 6000 times liquid to control the pear birch, yerba mate and yellow peony. Control effect, the results 5d after drug larvae stop foraging, stop growing; larvae atrophy gradually died after 10d drug, while the larvae of control larvae, will be picked up to 2 years of birth site; 15d after the drug larvae larvae mortality rate of more than 98%. This discovery can solve a major problem in the prevention and treatment of pear stem bee. Pyriactomida control methods and acetamiprid have certain control effects on pear wood nymphs, green nymphs, and leaflets, which can serve many purposes. Do more with less. Friends of the broad masses of farmers can not prevent the use of acetamiprid in the prevention and treatment of pear birch in the spring of 2012. Not only can they prevent and control locusts, but they can also have unexpected effects on pear stem bees, combined with artificial control, and killing pear stalk bees Adults and the cutting and killing of individual living larvae or pupae during winter pruning will surely achieve the best results in preventing and curing pear stem bees.
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