Distribution and damage: Injury to apples, pears, hawthorn and cherry blossoms, West House and other sea. Injury: Adults and nymphs cluster on the back of the leaves to suck juice. The front of the victim's leaf appeared pale chlorotic spots, and a large amount of brown mucus on the back of the leaves showed yellow brown rust stains on the back of the leaves, which could cause mildew. Morphological characteristics Adults: 3.5 mm in length, flat in shape, dark brown. Both sides of the front chest and the front wings are covered with a reticular pattern. When the two wings are still, the two wings overlap, and the dark brown stripes in the middle show an "X" shape. Eggs: oval, yellow-green. About 0.6 mm long, one end bent, produced in the mesophyll tissue. Nymph: It resembles an adult and has a thorn in its abdomen. It is white when it is newly hatched, and it turns dark brown later. A total of 5 instar nymphs, wing buds after 3rd instar. Life History and Habits: The worm took 4-5 generations a year in Henan Province. Adults shed winter under fallen leaves, tree gaps, and clods. In late spring and mid-April, Hunchun began to feed and spawn on the back of the tree, and the eggs were produced in the dorsal tissues. There is a brown rubber covering, and each adult lays 1 egg each time, with an average of 16 per female. After nymphs are hatched, multiple clusters of major veins are damaged on both sides. The first generation of adults occurred in early June, the second generation of adults occurred in early July, the third generation occurred in early August, and the fourth generation occurred at the end of August. All generations are irregular and there are overlapping generations. July-August was the worst. Control methods: Prevention and control should focus on the elimination of overwintering adults and the first generation of nymphs. 1. Artificial control: Before the winter trees fall under the adults, they are tied to the trunks to trap and eliminate overwintering adults. Sweep the garden in winter, deepen the tree tray, scrape the bark and eliminate the overwintering adult. 2. Control of pesticides: The overwintering of adult worms during the flood season (mid-April) and the first-generation nymph larvae during the hatching period (late May) are the critical periods for chemical control. Optional: 40% omethoate 2000 times; 80% dichlorvos 2000 times. 20% of fenvalerate or 10% of cypermethrin EC 3000 times, respectively, the trunk rhizosphere spraying prevention and control of cockroach adults (mid-April) and the middle of the crown to prevent and control the first generation of nymphs, the effect is very good.
China Daily chemical Suppliers
Here you can find the related products in Daily chemical, we are professional manufacturer of Daily chemical. We focused on international export product development, production and sales. We have improved quality control processes of Daily chemical to ensure each export qualified product.
If you want to know more about the products in Daily chemical, please click the Product details to view parameters, models, pictures, prices and Other information about Daily chemical.
Whatever you are a group or individual, we will do our best to provide you with accurate and comprehensive message about Daily chemical!
Hydrolyzed Keratin, Menthol, Daily Chemistry, Cosmetics Field Xi'an Gawen Biotechnology Co., Ltd , https://www.ahualynbio.com