Author: Green leaves have love
Citrus whitefly is divided into whitefly and blackbrush. Whitefly pests use nymphs to suck on young citrus leaves, causing young leaves to wilt, retreat and turn yellow, and secrete a large amount of honeydew, inducing soot disease, which seriously affects the growth of fruit trees and the quality of fruits.
Citrus whitefly, 3 to 4 generations a year, overlapping generations. In late February and early to mid-March of the following year, it feathers into adult insects, and from April to May, mid-June to late July, and late August to mid-September, whitefly parasitize on the leaf backs of young leaves in spring, summer, and autumn. It prefers shaded and humid environments, and citrus groves with poor ventilation and light transmission are particularly harmful.
Small whiteflies are harmful, and it is urgent to control citrus whitefly.
Prevention and control method 1: agricultural control.
Remove parasitic plants such as holly, ear fungus, and green bamboo around the orchard. When pruning in winter, dead branches, branches with too dense inner chambers, and weak branches can be pruned. Before each release, the scattered young shoots are removed to achieve uniform placement and neat pumping. After the shoots are released, comb the overly dense shoots, remove dead branches, and increase the ventilation and light transmission of the canopy.
Prevention and control method two: physical control.
Taking advantage of the yellowing nature of whitefly, during the peak feathering period of adult whitefly, the orchard hangs a yellow plate, which can trap a large number of adult whitefly adults.
Prevention and control method three: chemical control.
The best period for chemical control of citrus whitefly is during the peak of adult whitefly and 1st to 2nd instar larvae. In the adult and larval bloom stage, 5% acetamidine 1500 ~ 2000 times liquid + 50% methylthiocine 1000 times liquid or 20% thiamethoxamine 2000 ~ 3000 times liquid + carbendazim 800 ~ 1000 times liquid or thiamethoxine 1500 times liquid + Dow Yoson 800 ~ 1000 times liquid or spiro ethyl ester 3000 ~ 4000 times liquid + 70% propensin zinc 1000 ~ 2000 times liquid mixed spray, which can kill whiteflies, but also can prevent sootot disease. Those who already have soot disease can add 99.9% luying 200 to 400 times liquid or oil emulsion 200 times liquid (not used during the fruit coloring period) spray together to kill soot disease. Note: When spraying, be sure to spray to the inner chamber of the citrus canopy and the front and back of the leaves, so that the spray is even, leaving no dead corners.