Scarab
Lepidoptera, Hymenoptera. The larvae are also known as larvae, hot peppers, star anise and so on. It occurs in most parts of the country and is miscellaneous. It damages more than 100 trees and fruit trees and is an important pest. The larvae of the yellow-spotted moth are also known as the larvae of the lepidoptera and the octagonal worm. It is widely distributed and occurs throughout the country. It is miscellaneous and eats more than 120 species of trees. It is one of the major insect pests that eat leaves.
(1) Morphological characteristics.
1 adult. Orange yellow, antennae filamentous, tan. Female moths are 15 to 17 mm in length, 35,39 mm in wings; males are 13 to 15 cm in length and 30 to 32 mm in wings. The inner half of the fore-fin is yellow and the outer half is brown. There are two dark brown slash lines converging at the top corner. The shape is “eightâ€. The inside one extends to the back edge and is near the middle, becoming the dividing line between the two parts. Reach out to the hip point. The hind wings are grayish yellow, with yellow-brown round spots near the fin base and middle chamber.
2 eggs. Flat, light yellow, about 1.4mm long, about 0.9mm wide.
3 larvae. The mature larvae are 16 to 25mm long, nearly rectangular, and slightly larger at the front end. Bright color, base color is yellow-green. The head is dark brown and often shrinks under the chest. On the back of the body, there is a large, purple-brown spot, dumbbell-shaped, with a blue outer edge. From the second quarter of the cutting section, there are 1 pair of spikes on the subcontinental line. Among them, the spikes in the 3rd, 4th, 10th, and 12th sections are the largest, the sides of the body are on both sides, and there are 9 pairs of spikes. Toxic hairs are born. Gastropod degeneration, but with suction cups.
4 蛹. Body length 12mm, brown.茧 Oval shape, hard texture, smooth surface, gray-white pods with dark brown vertical stripes, shaped like quail eggs. (2) Living habits. One generation occurs in North China each year, and the Yangtze River Valley and other provinces south of the country occur two generations a year. The old mature larvae lay on the tree for winter. In June and June of the following year, adult worms emerged. In June, the adults appeared on the back of the leaves during the day, and they were active at night and had phototaxis. Spawn on the back of the leaf near the end, scattered or several grains together. The average female lays 49 to 67 eggs and the adult life span is 4 to 7 days. The eggs were incubated for 5 to 6 days. The newly hatched larvae fed the egg shells and then fed the leaves. They only took the lower epidermis and mesophyll tissues of the leaves and left the epidermis, showing round and transparent spots. At the 4th age, the leaves were taken as meshes, and the whole leaves were eaten after 5th instar, leaving only the main veins and petioles. The poisonous hair on the body of larvae causes severe skin irritation and itching after touch. In July, the mature larvae first spun silky branches, after the end of the pods, crickets are generally more in the branch points. When the feather is broken, the small round cover at the top of the clam shell emerges and the outlet is round. A new generation of larvae emerged in large numbers after late August and after the fall, they lay on the trees for wintering.
(3) Control methods.
1 Remove insects. After falling leaves in winter, combine pruning to remove the insects on the trees to kill the overwintering pupae.
2 Remove the leaves. The first-instar larvae of the moth are clustered on the back of the leaves, causing damage to the yellow leaves. The phenomenon was discovered in May and June. Manpower was collected in time to remove worms and eliminate larvae.
3 trapping adult worms. In mid-June, the emergence period of adult larvae was 19-21, and the black light was used to seduce the adults.
4 chemical control. In the first half of June, the initial stage of larvae, with 90% crystal trichlorfon 30% trichlorfon EC, 80% dichlorvos EC, 50% phosphine and other 1000 times, 2.5% enemy killing EC, 20% killing Emulsion 3000 ~ 4000 times liquid spraying leaves, every 7 to 10 days 1 times, a total of 3 times, the effect is very good.
5 bacteria kill insects. During the occurrence period, the larvae can be killed in a large amount by spraying the leaves with 800 to 1000 times of the powder of the worm.
6 use natural enemies. In the flood season, there are natural enemies such as the Shanghai blue bee and jigabee, etc.; adults have predatory moths; larvae have pathogens. By protecting natural enemies, or feeding, releasing the bee-bees in the period of occurrence, generally 3 to 4 times, you can effectively control the damage.
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