Experimental Study on the Efficacy of Biological Fungicides in Preventing and Controlling Pieris rapae
With the increase of cruciferous vegetable planting area,the occurrence of Pieris rapae is becoming more and more serious.To reduce the use of chemical pesticides,avoid long term use of the same pesticide and ensure the safety of vegetable production,three biological pesticides of 0.3%matrine aqueous solution(AS),16 000 IU/μL bacillus thuringiensis suspension concentrate(SC)and 5%methylamino-avermectin benzoate salt water dispersible granules(WG)were used to carry out field prevention and control experiments on Pieris rapae by taking 25 g/L efficient cyhalothrin emulsifiable concentrate(EC)as pesticide control and water as blank control.The results showed that the control effects of different biological pesticides on Pieris rapae were different.Among them,16 000 IU/μL bacillus thuringiensis SC of 50 g per 667 m2 had the best control effect with 78.40%,81.39%,80.58%at 3 days,5 days,7 days after treatment,respectively,which were significantly higher than the pesticide control,respectively.The following was 5%methylamino-avermectin benzoate salt WG of 5 g per 667 m2,whose control effects reached 67.57%,73.80%and 74.77%,respectively,which were higher than the pesticide control,but there were no significant differences between them,respectively.The control effects of 0.3%matrine were low.Overall,16 000 IU/μL bacillus thuringiensis SC of 50 g per 667 m2 showed the best rapid effect and the best persistent effect,followed by 5%methylamino-avermectin benzoate salt WG of 5 g per 667 m2.Therefore,to avoid using the same pesticide,16 000 IU/μL bacillus thuringiensis SC and 5%methylamino-avermectin benzoate salt WG could be alternately used to prevent and control Pieris rapae,which could reduce the use of chemical pesticides,delay the increase of pest resistance to pesticide and improve product safety.
Pieris rapaebiological pesticideprevention and control
万方数据
维普
