Dishes in the outskirts of Shanghai are mainly radish sprouts and oysters. They are the main pests of vegetables such as rapeseed and Chinese cabbage. They are particularly harmful during the seedling stage. They can also spread viral diseases. great influence.
Identify and occur:
(1) Radish: The wingless females are olive-green and have white powder; the winged females are black on the head and dark green on the abdomen, and there are black spots on both sides of the abdomen before the abdomen. The abdomen is shorter and the abdomen is shorter. Looks wide circle;
(2) Myzus persicae: There are many differences in body color between wingless females, green, yellow-green, orange or reddish-brown. There is no white powder on the body, and there are no black spots. The winged females are black on the chest and green on the abdomen. , yellow-green, brown or auburn, and there are obvious dark stripes, the base of the base of each antenna has a knob-like protrusions, slender abdominal tube, abdomen appears narrow.
Prevention:
When the locusts were concentrated, they were treated with 10% imidacloprid WP at 3000 times, and the locusts were eliminated at the stage of spotting as early as possible. The prevention and control of the locusts spread on the rape and caused difficulties in the later stage of prevention and control.