Whitefly, also known as white moth. It belongs to the HOMOPTERA whitefly family. It is a worldwide pest, which occurs all over China. It is an important pest for planting crops in vegetable fields, fields, greenhouses and greenhouses. The host range is wide. Cucumber, kidney bean, eggplant, tomato, pepper, wax gourd, beans, lettuce, Chinese cabbage, celery, green onion, etc. It can be harmful to vegetables, but also to flowers, fruit trees, medicinal herbs, grasses, tobacco and other 653 species of plants in 1 12 families. Distribution area

1 species whitefly insect. One of the main pests of vegetables and ornamental plants. China starts from Daqing in the north, Shijiazhuang in the south, Lanzhou and Xining in the west and Jinan in the east. It is distributed in Japan and Holland.

Growth habit

There are more than 10 generations in the northern greenhouse, so they can't overwinter outdoors in winter, but overwinter with eggs in the open field in southern central China. Adults can mate and lay eggs 1-3 days after emergence, with an average of 142.5 eggs per adult. It can also be parthenogenetic, and the offspring are male. Adults tend to be tender and lay eggs on the tender leaves at the top of the plant. Eggs are inserted into leaf tissues from stomata with egg stalks, which keep water balance with host plants and are extremely difficult to fall off. Within 3 days after hatching, nymphs walk short distances on the back of leaves. When the mouthparts are inserted into the leaf tissue, they begin to live a fixed life and lose their crawling ability. The optimum breeding temperature of whitefly is 65438 08 ― 265438 0℃. Move to an open field with seedling transplanting or greenhouse ventilation in spring.

When the environment is suitable, it will take about 1 month to complete 1 generation, and 1 year can occur1generation or more. 1 Female insects can lay 40 ~ 50 eggs. Female adults have the habit of choosing young leaves to gather and lay eggs. With the growth of host plants, adults gradually move to the upper leaves, resulting in the vertical distribution of each insect state on plants, which often shows obvious laws. Newborn eggs are green, mostly concentrated in the upper leaves, mature eggs are located in the lower leaves, then the first instar larvae and old larvae, and the lowest leaves are mainly pseudopupae and newly emerged adults.

Host (of parasites)

Cucumber, kidney bean, eggplant, tomato, green pepper, Chinese cabbage, cauliflower, Chinese cabbage, rape, radish, chicory, konjac, celery and more than 200 kinds of flowers and crops.

Damage characteristics

File suction device, adults and nymphs suck plant juice, the injured leaves fade, turn yellow, wither, and even the whole plant dies. In addition, because of its strong reproductive ability, fast reproductive speed, huge population, numerous hazards, and the secretion of a large amount of nectar, which seriously pollutes leaves and fruits, sooty blotch often occurs, making vegetables lose their commercial value. In addition to seriously harming tomato, green pepper, eggplant, potato and other solanaceae crops, it is also a pest that seriously harms cucumber and kidney beans. Morphological characteristics: The adult is about 0.9- 1.4 mm long, yellow-white or white, with wings for both sexes, covered with white wax powder, and the female is larger than the male, and its ovipositor is needle-shaped.

egg

Long oval, about 0.2-0.25 mm long, light yellow at first, dark brown later, with egg stalk, produced on the back of leaves. Larvae (or nymph) is oval and flat. Pale yellow or dark green, with waxy filiform protrusions of different lengths on the body surface. Pupa is oval, about 0.7-0.8 mm long. The middle is slightly convex, yellow-brown, and there are 5-8 pairs of uneven wax wires on the back of the body.

control technology

The area with the most serious occurrence, the most generations and the strongest resistance of whitefly is Shouguang area. General products are good in other places, but the effect in Shouguang is not particularly ideal. Recommended by local farmers for many years: the most effective control agent for whitefly comes from the specific drug of Zhengzhou Shalongda Agricultural Science and Technology Co., Ltd.: sand powder.

Whitefly, whitefly

Formula: phenoxy high chlorine+dinotefuran+whitefly repellent.

Features: domestic exclusive formula, quick-acting, killing insects and eggs, lasting for 25 days. It can control whiteflies such as whitefly, rice planthopper and Bemisia tabaci. Green exports of vegetables, rice and cotton have no resistance.

. Weifang Wansheng Bio-pesticide Co., Ltd. solved the problem of common people's headache with its fast knock-down speed and long duration. At present, the better chemicals on the market are: 0. 12% propylene glycol alginate, which is fast, non-resistant and pollution-free. 24.5% nitenpyram kills insects and eggs with long duration, which is produced by Zibo Youlier Industry and Trade Co., Ltd., Shanghai Tianfengli Pesticide Co., Ltd. and China Agricultural Network. Acetamiprid, with a general content of 3%, is produced by Hainan Yezheng Zhongnong High-tech Co., Ltd., and its trade names are Yezheng Gefei (3% acetamiprid) and Jingefei (30% acetamiprid).

Occurrence and harm

Whitefly is a pest introduced in 1970s, which harms fruit trees such as grapes, apples and persimmons, as well as vegetables such as tomatoes and lettuce and paulownia trees. At first, it was thought that this insect could only breed in the greenhouse, but in recent years, it has become a big pest in the courtyard of Changli, Hebei Province, and can naturally overwinter outdoors, becoming the main pest of grapes, flowers, vegetables and green trees in the courtyard, especially grapes and paulownia, with a large amount of occurrence and serious harm.

Adults and nymphs harm leaves by sucking mouthparts, and leaves are damaged by green spots, which can also lead to mildew. Adult body length1-1.5 mm. The wings and chest are covered with white powder. When stopped, the wings are folded into a roof shape with simple texture. The egg is 0.2 mm long, oval, stalked at the base, light green when it is first hatched, covered with white powder, and brown when it is near hatching. Nymphs are 0.8 mm long, pale green, and have uneven wax filaments on their backs.