9种生物农药对烟田斜纹夜蛾的防治效果研究OA

[Objective]This study was conducted to clarify the control efficacy of nine biotic pesticides against Spodoptera litura,so as to provide information for selecting safe and efficient biotic pesticides to control this pest.[Method]The indoor toxicity and field control efficacy of Nuclear Polyhedrosis Virus,Veratridine Acaricide,Nicotine Matrine Insecticide,Methionitrile Insecticide,Avermectin Insecticide,Azadirachtin Insecticide,Matrine Insecticide,Rotenone Insecticide and Bacillus Thuringiensis Methionine against Spodoptera litura were determined by indoor immersion and field spray methods in tobacco areas in Jiangxi.[Result]The indoor testing showed that,after adopting the above nine biotic pesticides,the corrected mortality rate of Spodoptera litura exceeded 85%on the 10th day,and the rate exceeded 90%on the 10th day after the treatment of Nuclear Polyhedrosis Virus,Veratridine Acaricide,Methionitrile,Avermectin,Azadirachtin and Bacillus Thuringiensis Methionine.Nine biotic pesticides could all control Spodoptera litura effectively.The corrected control efficacy of Methoxyfenitrile,Avermectin,Azadirachtin and Bacillus Thuringiensis against Spodoptera litura reached 70.85%,71.84%,75.78%and 73.81%,respectively,on the 15th day after spraying in tobacco field.No visible symptoms of pesticide damage occurred on the buds,leaves and stems of tobacco when these biotic pesticides were sprayed during the growth period of tobacco.[Conclusion]The nine biotic pesticides tested are all effective when fighting against Spodoptera litura.Comparitively,Methotrexate,Avermectin,Azadirachtin and Bacillus Thuringiensis have much higher efficiency in field control.