Guai

Diaphaniaindica Saunders is also known as Gualou, Guagua. The taxon belongs to Lepidoptera and Saccharidae.

The host has balsam pear, gourd, zucchini, melon, wax gourd, watermelon, tomato, eggplant, and cotton.

What are the hazards? Damaged by larvae feeding leaves and pods. The first instar larvae feed on the back of the leaves, and the third instar larvae are fused with silk or young shoots, and they are stored in them, resulting in nicked or perforated leaves. In severe cases, only leaf veins are left behind. And can damage melon strips, break into the melon or stem, larvae and fruit into a hole, reduce the value of goods, or cause fruit rot, can not eat.

Morphology: Adult moths are small in size (about 12 mm in length and about 25 mm in wingspan), white and nearly transparent in the wings, and black bands in the leading and trailing edges. The larva is pale green and has 2 white vertical lines on its back.

Living habits can occur 4-6 generations a year south of the Yangtze River in China, with mature larvae and cockroaches in the melon culms or in the host's dead leaves or in the topsoil winter. At the end of April of the second year of life, the adults emerged at night and lurked during the day. Their phototaxis was strong. Spawning was mainly on the back of the leaves. A female moth could produce 200-400 eggs on average. May larvae damage, larvae have 5 instars, the newly hatched larvae have a cluster, once the delay in the prevention, in the short term (3 - 5 days) cluster turmose eat out of the harvest. began to bite on the leaves, frightened that drooping drooping The transfer is harmed elsewhere. After the 3rd instar, the silkworms feed on the leaf, and when the larvae are mature, the white pods and phlegm are made in the leaf. The egg period is 5-7 days and the larval period is 9-15 days. The newly hatched larvae feed on the back of the leaves and the residual epidermis shows grayish white patches. The larvae transfer their habits when the larvae have drowned when they are scared; 4 to 5 years of age. The larvae have a large amount of food and have a significant increase in drug resistance. When the leaves eat up, they eat the fruits and tender vines. Flea period 7-9 days.

In Hangzhou, the natural enemy of this insect is the egg parasitoid Trichogramma californica, the larvae parasitize the Philippine island flat venom wasp and the larvae T. argentatus, and the parasitoid larvae to the pupa stage of the chamber ichneumon have 4 species, of which the eggs are parasitic. The parasitism rate of Australian Isomidae is high (up to 60% or between 8:00 and 10 months). The damage to quails is obviously inhibited and should be protected and utilized.

Control methods
1, pay attention to protect the use of natural enemies. When the average daily temperature is 17 to 28°C and the egg parasitism rate exceeds 60%, try to avoid spraying.
2. Manually kill larvae.
3, master the larvae spray poisoning at low age. 21% killing 毙8000 dilutions, or 20% fenvalerate 4 000 55000 dilutions, or 25% cypermethrin 2,000 times dilutions, or 20% chloromacmonol 3000 times, or 50 可用% Phoxim, or 50% of malathion 1000 times, 24% 1500 times, 10% 2000 times, 15% 3500 times, 0.3% natural 2,000 times, spray. Note: Most of the worms are harmed on the back of the leaves, so spray should be applied evenly on the opposite sides of the leaves.

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