In recent years, the ash-toothed bee was seriously harmed in the North China Petroleum Industry and Mining Area of ​​Renqiu City, Hebei Province, affecting the landscape effect of greening and beautification. The following small series introduces the hazard characteristics, occurrence regularity and control techniques of the white waxed bee bee.
First, the law of occurrence
The stalk of the stalk of the stalk is overwintered by the mature larvae in the branches of the year. From mid-March to the end of March of the next year, the stalked bees were continuously sputum before and after the host buds sprouted, and the flooding period was about 20 days. In the middle and late April, the branches of the host grew to 10 cm to 20 cm, and the weak short branches stopped. When growing, the waxy bee stings begin to emerge. Adults are active during the day, rest at night, and stop at the leaves to lay eggs, 7 to 8 days. From late April to early May, the newly hatched larvae are jeopardized from the petiole of the host's compound leaf petiole. In the middle and late May, it can be seen that the top of the victim host is wilting and drooping. When the wind or rain occurs, the compound leaves often fall off from the petiole. In June, it began to overwinter in the summer branches.
Second, the hazard characteristics
The white wax outer toothed bee mainly harms the current year's branches of the white wax and the white wax. The newly hatched larvae broke into the pith of the tender branch from the first pair of petioles of the new year, and then gradually advanced upwards, and the excrement was stuffed in the hollow tunnel. Generally, there are 1 to 5 larvae in each damaged branch, causing the compound leaves of the affected part to wither and wilting, affecting the landscape effect of greening and beautifying.
The larvae feed on the xylem laterally before wintering, leaving only the branches of the branches. Symptoms on the branches are round or elliptical brown spots with a diameter of 5 mm to 7 mm. The center of the spot has a circular hole with a diameter of 2 mm leaving only the epidermis of the branches. This is the adult feathering orifice. The orifice is an important marker for finding the worm. Each year, there are 1 to 4 feathering holes in the branches, and the larvae are in the pith of the branches 1 mm to 3 mm below the feathering holes, where the larvae can be found by breaking the branches.
Third, prevention and treatment methods
Cut off the insect branches and combine winter tree pruning to eliminate wintering larvae. Generally, when trimming in winter, the branches with brown spots are cut off. In the spring, the wilted insect branches were found and immediately cut off. The cut off of the insect branches should be burned intensively. Do not throw them away at random to prevent the spread of pests.
Spraying adult insects in the middle and late April, the adult larvae of the white wax beetle, can spray 1.2% bitter emulsifiable concentrate 800 ~ 1000 times liquid, or 3.5% deltamethrin 3000 ~ 3500 times liquid, or 6% One of the imidacloprid emulsions 3000 to 4000 times liquid sprays on the foliage and the current shoots, and kills the adult insects.
The trees are dry at the end of winter and early spring, and 6% of the imidacloprid emulsion is injected into the tree by diluting the original liquid by 10 to 20 times, and injecting 1 ml of the liquid per 1 meter of the diameter of the tree to poison the wintering larvae and the initial hatching. larva.
Root application of drugs around the tree pit trench or evenly perforated, according to the tree per metre diameter of 1cm applied 3% of carbofuran granules 8 ~ 10g, immediately after pouring 1 permeable water, also has better control effect.
Hanging yellow wormwood stalks and stalks have strong color-developing properties. The use of apricot yellow or orange-colored sticky worms to control the stalks of stalks, not only can greatly reduce the number of pests, no pesticide residues, and does not pollute the environment. It is easy to operate, economical and practical, and it meets the technical requirements of garden pollution-free prevention and control. It is a good physical control measure.
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