It is no longer difficult to control the large-leaved boxwood curl borer, just do the following points

Boxwood silk borer, genus Lepidoptera, moth family. It is widely distributed throughout the country. Mainly larvae are the pests of large-leaved boxwood, melon seed boxwood, Lushan boxwood, bird's tongue boxwood, holly and guard spear. This insect is sudden, mild affecting normal growth, heavy leaves withering and shedding, resulting in bare branches, resulting in the death of young plants.

[1] Pattern recognition

1, adult insects: body length 14-19mm, wingspan 33-45mm; head dark brown, scales between the antennae of the top of the head white; antennae brown; lower lip must be section 1 white, section 2 lower white, upper dark brown, section 3 dark brown; thorax, abdomen light brown, thorax has brown scales, abdomen end dark brown; wings white translucent, there is purple flash, the forewing leading edge is brown, there are two white spots in the middle chamber, one is small, the other is curved into a crescent, and the outer and posterior edges have a brown band. The outer margin of the hindwings is blackish brown.

2. Egg: oval, 0.8-1.2mm long, white to milky white at the time of initial birth, light brown before hatching.

3. Larvae: 42-6mm body length and 3.7-4.5mm head width when old and mature; milky white at the beginning of incubation, black-brown head before pupal, yellow-green carcass, glossy hairs and sparse burrs on the surface, large black spots on the front chest and back mask, triangular shape, 2 pieces; dorsal line green, subtechondria and valve line black-brown, valve line pale yellow-green, baseline and ventral line light blue-gray; chest foot dark yellow, gastropod pale yellow-green.

4. Pupa: spindle-shaped, tan, 24-26mm long and 6-8mm wide; there are 6 hip spines at the tail end of the abdomen, and the cocoon is cocooned with silk-embellished leaves, and the cocoon is 25-27mm long.

[2] Occurrence law

Five generations a year occur in Nanchong, Sichuan, 3 generations a year in Shanghai, Jiangsu and Zhejiang, and 2 generations a year in North China, all of which overwinter in the leaves with larvae. In North China, the activity of overwintering larvae is infested from mid-March to early April of the following year, and the pupal period is about 9 days in early May, and pupate in the leaves in mid-May. Adults have a weak phototropism, day and night, and the female moth lays eggs on the back of the leaves, and the egg stage is about 7 days. The larvae are 6 years old. The larvae in Shanghai are infested, and the generation is from early May to early June, the second generation is from early July to early August, and the third generation is from late July to late September. If the control is not timely, the leaves will eat away the light and the plant will turn yellow and wilt. In late September, the larvae form a net of leaves to make a bag, and in the bag, they form a thin cocoon to overwinter.

[3] Prevention and control methods

1, strengthen quarantine: the insect host is limited to the boxwood family, and the adult insect flight is weak, long-distance transmission mainly depends on man-made seedling transportation, so do a good job of quarantine, put an end to the spread of pests with the transfer of seedlings, can effectively control the spread of the insect.

2, do a good job in manual prevention and control:

(1) Removing dead branches and leaves in winter and destroying the cocoons of overwintering insects can effectively reduce the source of insects in the second year.

(2) The use of its nesting habit in the first generation of young age to remove the nest in time, remove the pupal cocoon during the pupal stage, and destroy it in a centralized manner, which can greatly reduce the harm of the year.

(3) Set up black lights for booby-trapping.

3. Rational use of drugs: the key period of drug control is the emergence stage of overwintering larvae and the young stage of the first generation of larvae, using 45% propyl bromide thiophos 1000 times liquid, or 20% cypermethrin 1500 times liquid + 5.7% methyl vitamin salt 2000 times mixed liquid for spraying, but also promote the use of some low-toxicity, non-polluting pesticides and biopesticides, such as avermectin, BT emulsion, etc.

4. Protect and utilize natural enemies: such as concave-eyed wasps, jumping wasps, parasitic flies, etc.