Sylepta derogata Fabricius is also known as cotton leafhopper. The main damage is hollyhock, hibiscus, hibiscus, indus, and other ornamental trees.
Hazardous features: Newly-incubated larvae only eat leafy flesh, leaving the epidermis behind. After the third instar, the leaves are coiled, hidden inside the leaves for feeding, and the worms are placed inside the leaf. The insects have the habit of replacing insects. When the insects are harvested, they can form a large number of insects on the canopy, and later eat the leaves into a broom-like shape, which not only affects the growth but also seriously damages the viewing.
? Morphological characteristics? Adults 10-14 mm long, 22-30 mm wingspan. All yellow-white, flash. There are 12 brown-black dots on the thoracodorsal side arranged in 4 rows, and there are 1 hairs in the first row. The male moth has 1 black horizontal stripes at its base and the black horizontal stripes of the female moth are at the posterior edge of the 8th abdominal segment. Before and after the wings of the outer edge of the line, the outer edge of the outer line, the inner horizontal line are brown wavy lines, oval eggs, slightly flat, about 0.12 mm, milky white at the beginning of production, and later turned pale green. The grown larvae have a body length of about 25 mm and are all green and green, turning pink when old. About 13-14 mm long, it is bamboo shoot-like, reddish-brown, with spiky processes from the ninth to the end of the abdomen.
?? Occurrence characteristics? This worm occurs 3 to 5 generations a year, with mature larvae in weeds and host plants leaves, stubble winter. During the second year of April, larvae were pupaed. In May, the eclosion was adult, and adults were able to emerge from June to August. After adult mating, spawning on the host plant, the first generation of larvae is mainly responsible for hibiscus and hollyhock. The second generation seriously injure the indus, and the newly hatched larvae are harmed by clusters. They feed on the mesophyll. After the third instar, they cover the leaves and encroach on the leaves. , And there is the transfer of harm, a bug can build a number of insects habits. Larvae usually occur more often in shelters. Adults have phototaxis.
?? Prevention methods
1, adult eclosion period, lighting and trapping adult.
?? 2, when a small amount occurs, manually remove young leaves.
?? 3, clear the garden, the removal of odontophis and dead leaves in winter, can reduce the number of overwintering larvae, so that the amount of suppression in the second year.
?? 4, to protect natural enemies, the natural enemies of this parasite parasitic parasites in the body of the larvae of the larvae, larvae to the pupa during the intervening period, there are wide-black spots, Ji Ji, and corn cricket thigh wasps. In addition, there are natural enemies such as grasshoppers, grasshoppers, and spiders, all of which have a certain inhibitory effect on the occurrence of this insect and can be studied and utilized.
?? 5, when there is a wide area, in the early stage of the occurrence of pesticides in a timely manner.
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