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Issue:ISSN 2095-1353
           CN 11-6020/Q
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Your Position :Home->Past Journals Catalog->2016年53 No.4

Toxicity of Beauveria brongniartii to two cutworm species
Author of the article:LIU Cong-He1** WANG Yu-Wei1 YU Hong-Chun1*** SUN Yi-Feng1 HOU Yue-Min1 ZHAO Kui-Jun1 LI Ke-Bin
Author's Workplace:1. College of Agriculture, Northeast Agricultural University, Harbin 150030, China; 2. Institute of Plant Protection, Chinese Academy of Agricultural Sciences, Beijing 100193, China
Key Words: Beauveria brongniartii, Agrotis ypsilon(Rottemberg), Xestia c-nigrum (Linnaeus), bioassay, pesticide adjuvant
Abstract:

[Objectives] To determine the toxicity of the Beauveria brongniartii strain NEAU30503 to larvae of the spotted and black cutworm. [Methods] The leaf dipping method was used to determine the toxicity of NEAU30503 to young cutworm larvae and the soil treatment method to determine its toxicity to older instar larvae. [Results]  The toxicity of NEAU30503 to 5-day-old larvae of spotted cutworm at day 15 post infection can be expressed by the regression equation y=0.6568x0.1636 (r=0.9846). The LC50 and LC80 were 7.28×107 conidia/mL and 139.14×107 conidia/mL, respectively. The toxicity of NEAU30503 to 5th instar spotted cutworm larvae can be expressed by the regression equation y=1.0929x3.2893 (r=0.9801), with LC50 and LC80 of 3.85×107 conidia/L and 22.65×107 conidia/L, respectively. NEAU30503 was lethal to cutworm pupae, and clearly decreased the eclosion rate of cutworms. When NEAU30503 was mixed with tea saponin, the sublethal dose of beta-cypermethrin and abamectin could significantly increase the toxicity to black cutworms. [Conclusion]  The NEAU30503 strain was the most toxic to cutworms. NEAU30503 was more toxic to older instar larvae when delivered via the soil. When sprayed, a mixture of NEAU305035 with a sublethal dose of beta-cypermethrin or tea saponin had a significant effect on young cutworm larvae. This study provides a scientific basis for using Beauveria sp. to controll cutworms in the field.

 

 


 

 

 

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