Twill nocturnal moth is a class of omnivorous and binge eating pests, the harm is quite extensive, in addition to cruciferous vegetables, but also including melons, eggplant, beans, onions, leeks, spinach and grain, cash crops and other nearly 100 families, more than 300 kinds of plants. The larvae bite the leaves, buds, flowers and fruits, and the young larvae eat the epidermis and leaf flesh of the leaves, leaving only the upper epidermis as transparent spots; after 4 years of age, they enter binge eating, bite the leaves, leaving only the main vein. On cabbage, the larvae can also burrow into the leaf bulb to harm, empty the inside, and excrete feces, causing pollution, reducing or even losing the value of the commodity. So how should the twill moth be controlled?
Morphology of the twill nocturnal moth
Eggs: Flattened hemispherical, yellowish-white at first, then dark grey, lumpy and bonded together, covered with yellow-brown villi.
Larvae: 33–50 mm long, black-brown head, varied thorax, ranging from earthy yellow to black-green, with small white dots scattered on the surface of the body.
Pupae: 15–20 mm long, cylindrical, reddish-brown, with a pair of short spines on the tail.
Adult: body length of about 14-20 mm, wingspan of 35-46 mm, dark brown body, white tuft hair on the back of the thorax, gray-brown forewings, patterns, inner and outer transverse lines white, wavy, the middle has a clear white oblique broad band, so it is called twill nocturnal moth.
Control measures for the twill moth
1. Agricultural prevention and control
1. Remove weeds, plough the soil or irrigate after harvest to destroy or worsen its pupae site, which will help reduce the source of insects.
2. Combine management to remove egg blocks and cluster hazards of hatching larvae to reduce the source of insects.
2. Physical prevention and control.
1. Light the lamp to lure the moth. Using the phototropism of adult insects, they are booby-trapped by lighting black lights during the peak period.
2. Sweet and sour booby traps. Adult chemotaxis are used with sweet and sour (sugar: vinegar: wine : water = 3:4:1:2) plus a small amount of enemy insects to lure moths.
3. Dip the willow branch into 500 times the enemy insects to trap the moths.
3. Pharmaceutical prevention and treatment.
Alternately sprayed with 21% extermination emulsion 6,000 to 8,000 times liquid, or 50% cypermethrin emulsion 4,000 to 6,000 times liquid, or 20% cyano or chrysanthemum emulsion 2,000 to 3,000 times liquid, or 2.5% kung fu, 2.5 percent Uranus emulsion 4,000 to 5,000 times liquid, or 20 percent to kill salixo emulsions 3,000 times liquid, or 80 percent dichlorvos, or 2.5 percent to kill urea, or 25 percent malathion 1,000 times liquid, or 5 percent cardiac, or 5 percent nonmonte 2 000 ~ 3 000 times the liquid, 2 to 3 times, once every 7 to 10 days, spray well.