I. Characteristics of Hosts and Damages of Bemisia tabaci The main hosts in the city's growing crops are cucumbers, tomatoes, eggplants, cowpeas, cotton, etc., which lead to whitish stems, yellow leaves falling off, damage cabbage, broccoli, resulting in leaf atrophy, Yellowing, withering;
Second, the whitefly identification characteristics of eggs: long pear-shaped, with a small handle, vertical with the leaf surface, mostly scattered on the back of the leaves. It is pale yellowish green at the time of first production and darkens before hatching.
Nymphs: A total of three instars, light green to yellow. The first instar nymphs have tentacles and feet and can crawl and migrate. After the first peeling, the antennae and feet are degenerated and fixed on the plants for feeding. After the third instar, it forms a pupa, and the detached skin hardens into a clam shell, which is an important feature to identify the species of whiteflies.
Shell: oval, sometimes concave, asymmetrical. Tubular hole triangle, longer than wide. The tongue is spoon-shaped and extends beyond the flap. The back of the clam shell is bristly, which is related to the morphological structure of the host. On the hairy leaves, the back of the carcass has bristles. On the smooth hairless leaves, the back of the carcass does not have long bristles.
Adults: body pale yellowish white, body length 0.85 to 0.91 mm, winged white, waxed powder without spots, forehead veins a bifurcation, when the left and right wings close together was ridge-like.
Third, in the city of cotton, cucumber, tomato and other crops have occurred, when the adult fly into a group, can cause devastating damage.
Fourth, chemical control: Mu with 25% flucarbazide 1000-1500 times liquid for prevention and treatment.
Pipette Tips,Eppendorf Pipette Tips,Gilson Pipette Tips,Yellow 200Ul Pipette Tips
Unimedsume Trading Co., Ltd , https://www.ums-labmed.com