Application of Pieris rapae granulosis virus insecticide in vegetable production

Pieris rapae granulosis virus, trade name: Yang Kang, Wuzhou No. 1, Pieris rapae virus, Wuda Oasis Precision Chong Ke, general name: Pieris rapae granulosis virus, the main dosage form is concentrated powder, it is a live virus insecticide, which is processed by the dead insect body infected with Pieris rapae granulosis virus. It is a low toxic insecticide, which only has toxic effect on target pests and does not affect bees and natural enemies. 1. Action mechanism and characteristics this agent is a live virus insecticide, which is made from the dead body of Pieris rapae granulosis virus. The insecticidal mechanism of the pest larvae is that after infected with the virus, the pest larvae act directly on the fat body and the nucleus of the midgut. After a few hours, the pests become stagnant and stop feeding, and finally climb to the leaf edge and leaf surface, and most of them hang upside down or die in the shape of "∧". The body of the dead worm is fragile, soft and fragile, and the yellowish-white pus containing Pieris rapae granulosis virus is discharged. The virus can infect other healthy cabbage insects through disease, insect feces or dead insects, resulting in the death of a large number of larvae. The virus is highly specific, effective only to target pests, does not affect the natural enemies of pests, does not pollute the environment, and lasts for a long time. two。 Application in vegetable production to control pests such as Pieris rapae, Plutella xylostella, Spodoptera litura, Spodoptera litura, Chilo suppressalis, Helicoverpa armigera and so on. The drug was used at the peak of egg hatching and before the third instar of larvae. Each 667m2 was diluted 750x with 40g powder and sprayed after 4pm in cloudy or sunny days. The effect lasted for 10 to 15 days. Insect corpses can be collected and smashed, and the filtrate can still kill pests by spraying the filtrate into the field. 20-30 fifth-instar dead insects can be used per 667m2. 3. Precautions should not be mixed with alkaline substances or fungicides; the best application period is the egg peak, no later than the 3rd instar of the larvae, and the control effect is poor when the larvae are old, and both the positive and negative leaves should be sprayed when spraying.