Control methods of whitefly

Whitefly is a worldwide pest, also known as small white moth, which occurs all over China and has a wide range of hosts. Cucumber, bean, eggplant, tomato, pepper, wax gourd, beans, lettuce, cabbage, celery, scallions, Danhua, etc., can also damage flowers, fruit trees, medicinal herbs, forage grass, tobacco and other 112 families and 653 species of plants. Let's take a look at the control methods of whitefly.

The living habits of whitefly

Whitefly occurs for more than 10 generations a year in the greenhouse in the north. It can't overwinter outdoors in winter, and overwinters in the open field with eggs in the south of central China. The adults could mate and lay eggs 3 days after emergence, with an average of 142.5 eggs per adult. It can also be parthenogenetic and its offspring are male. The adults tend to tenderize and lay eggs on the young leaves at the top of the plant. The egg is inserted into the leaf tissue from the stomata with the egg stalk to maintain water balance with the host plant and is not easy to fall off. The nymph walked a short distance on the back of the leaf within 3 days after hatching. when the mouthparts were inserted into the leaf tissue, the nymph began to live firmly and lost the ability to crawl. The optimum temperature for reproduction of whitefly is 18 ℃ and 21 min. In spring, it moved into the open field with seedling transplantation or greenhouse ventilation.

Hazard characteristics of whitefly whitefly

Whitefly damages fruit trees such as grapes, apples and persimmons, as well as many kinds of vegetables such as tomatoes, lettuce and paulownia. It is an important pest of grape, flowers, vegetables and greening trees in the courtyard, especially grape and paulownia. Adults and nymphs feed on plant sap, and the injured leaves fade, yellowing, wilting, and even the whole plant dies. In addition, because of its strong fecundity, fast reproduction, large population, gathering and harmful, and secreting a large amount of honey, seriously polluting leaves and fruits, it often causes the occurrence of coal fouling disease and makes vegetables lose their commercial value. In addition to seriously harming tomato, green pepper, eggplant, potato and other eggplant crops, it is also a serious pest to cucumbers and kidney beans.

Control methods of whitefly

1. Whitefly can be sprayed to control whitefly, including 600-800 times thistle lice, 1-fold thistle lice, acetamiprid, 1.3% (matrine), thiazide, acetamiprid, chrysanthemum EC, zinc cyanide EC, methotrexate, fenvalerate or Uranus, etc.

2. Bemisia Tabaci can introduce aphid wasps in the greenhouse, and the adults of whitefly have a strong tendency to yellow. The adults can be trapped with yellow plate and coated with stickworm glue, but they can not kill eggs and are easy to recur.