Occurrence rules and control methods of ash outer tooth stem bees
Regularity of occurrence
The white wax outer tooth stem bee mainly harms the villous white wax and foreign ash annual branches, generally there are 1 to 5 larvae in each affected branch, resulting in the compound leaf wilting of the victim part, affecting the greening and landscaping landscape effect.
The ash outer tooth stem bee occurs in one generation in the North China Petroleum Industrial and Mining Area of Renqiu City, Hebei Province, and overwinters with old mature larvae in the cocoon of the raw branches of that year. From early to mid-March to the end of March of the following year, the ash outer tooth stem bee pupates before and after the germination of the host bud, and the pupal period is about 20 days. In mid-to-late April, the host branches grow to 10 to 20 cm long and begin to feather when the weak short branches stop growing. Adults are active during the day, rest at night, and mostly stop at the leaves to lay eggs, with an egg period of 7 to 8 days. From late April to early May, the hatching larvae moth from the petiole of the host compound leaf into the marrow. In mid-to-late May, the top tip of the victim host can be seen to be wilted and drooping, and the wind or rain often causes the compound leaves to fall off the petiole. In June, it began to overwinter in the branches of the year.
Ash outer tooth stem wasp hazard
imago
larvae
Prevention and control methods
Pruning of insect branches combined with winter tree pruning to eliminate overwintering larvae. Generally in winter pruning, cut the branches with brown spots. In the spring, wilted branches are found and immediately pruned. The cut branches of insects should be burned in a concentrated manner, and should not be littered at will to prevent the spread of insect pests.
Spraying adult insects In mid-to-late April, the adult white wax outer tooth stem bee feathering period, can be sprayed 1.2% bitter smoke emulsion 800 ~ 1000 times liquid, or 3.5% cypermethrin 3000 ~ 3500 times liquid, or 6% imidacloprid emulsion 3000 ~ 4000 times liquid and other one of the foliar and annual shoot spray, poisoning adult insects.
In late winter and early spring, inject 6% imidacloprid emulsion into the trees by diluting the original drug solution by 10 to 20 times, and inject 1 ml of liquid according to the diameter of the tree 1 cm per meter to poison the overwintering larvae and hatching larvae in the branches.
Root application of drugs In the tree pit around the digging ditch or evenly punching holes, according to the tree per meter diameter of 1cm to apply 3% of the furandan granules 8 ~ 10g, immediately after the application of 1 times through the water, there is also a good control effect.
Hanging yellow sticky insect board White ash outer tooth stem bee has a strong color tendency, the use of apricot yellow or orange stickworm board control of white wax outer tooth stem bee, not only can greatly reduce the pest mouth base, no pesticide residue, do not pollute the environment, easy to operate, economical and practical, but also in line with the technical requirements of garden pollution-free prevention and control, is a good physical control measures.
Ash hash stem bees are adhered to by yellow armyworm plates