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1 Field identification
1.1 Injury characteristics: The moth mainly feeds on the leaves of larvae. The young larvae feed on the larvae. The residual epidermis and veins are white-yarn and easy to identify. The old larvae are scattered and damaged. The leaves show nicks or holes, and the leaves can be eaten seriously. Light, leaving only the veins.
1.2 morphological characteristics of human lines stained illusion 'moth adult size, male moth head, yellow-white chest, antennae jagged, black; abdomen back in the middle of red, back and side of each column of black spots. The fore wing is yellow-white and flesh-colored. There are 1 oblique black spots from the outer edge to the trailing edge. When the two wings are closed, they are in a "person" shape. The female moth has yellow and white wings and no red color. Oval spherical, milky white, with a flash. The mature larvae are brown and long-haired, with black heads, yellow-brown tans, pale yellow topline, black chest and gastropods, and 10 to 18 tumours in each segment. Dark brown, oval.
The eight gray moth adult size, head, chest white, slightly brown, black antennae; chest with black belt, orange above the leg section. The back of the abdomen is orange, with black spots on the back and sides of the abdomen. The female forewings are grayish white and the males are grayish brown in color. In addition to the leading edge zone, the veins are brown in color. The upper and lower horns of the central wing of the wings have two black spots, one of which is not obvious. Egg yellow, spherical, slightly flat bottom. The mature larvae are brownish black with white patches, black body, red-brown tufts, and engraved dots on the abdomen. Bare, gray.
The dust moth adult moth, equal size, light yellow, the base of the lower lip above the red, tentacles black, sometimes with a black belt on the back of the chest; abdomen back red in the middle, the back, side with black spots; wing tip to the rear edge Columns of black spots, when the wings are closed, are also clearly "human" type, the middle corner of the middle wing of the wing sometimes has black spots, and the outer edges of the wings sometimes have black sub-points. Egg yellow, spherical, slightly flat bottom. The mature larvae are brownish-black in colour, black in body, red-brown on the back, and a white line on the suborbital line.
1.3 Life habits The moths that occur each year vary from region to region and can occur from 2 to 6 generations from north to south. In the north, the mature larvae adorn the dead leaves or in the soil, and the bonded hairs of the silkworms make up for the wintering of the pupa, and the larvae can also overwinter in the south. The damage began in April of the following year, with the largest amount of insects in the 2nd generation and serious damage. Nocturnal adult activity, phototaxis. A single layer of eggs or tens of granules are produced together in the vicinity of the leaf dorsal or veins. Each female can produce 140 eggs. After hatching, the newly hatched larvae feed on the back of the leaves and can also damage the filaments and young fruit. Dispersed after age 3, mature larvae have a dead-dead habit. Most of the last-instar larvae crawl on the ground and spine sticky leaf knots, phlegm and phlegm, and others do not spit under the litter.
2 Control methods
2.1 Physical Prevention and Control Plowing land can eliminate part of the overwintering pests in the topsoil or stubs, reducing the source of insects. Use insecticidal lamps or black light lamps to trap adult insects. Before the larvae are dispersed, artificial leaf collection and killing are performed.
2.2 Chemical control The moth larvae generally do not need to be controlled by pesticides. When mixed with cruciferous vegetables such as cabbage worms, diamondback moths, or leguminous pea beans, the pests can be treated concurrently when controlling other pests.
For prevention and control, in the low-instar larvae stage, 4.5% beta-cypermethrin microemulsion, 5.7% cyhalothrin microemulsion, 20% fenvalerate EC and other pyrethroid pesticides such as 1500 to 2000 times or 50% dichlorvos are used. 50% phoxim EC, 48% LOS, and 1000 times organic phosphorus pesticides were sprayed and controlled.
The genus Moth is a larvae of the larvae of the lepidoptera, and the main species on the vegetable are the moth larvae, the ash moth, and the dust moth. The human moths are used in the same way as the red-bellied moth, the herringbone moth, and the dust moth, also known as the moth, and the moth. The above three species of moth mainly damage cruciferous, Solanaceae, Cucurbitaceae, leguminous and other vegetables as well as mulberry, tea, rice, cotton, and peanuts.