Pathogenicity of Beauveria bassiana on Larvae of Fall Webworm, Hyphantria cunea (Drury) (Lepidoptera: Arctiidae) at Different Temperatures
Onur Aker, Celal Tuncer
The fall webworm, Hyphantria cunea (Lepidoptera: Arctiidae)is a dangerous and destructive pest for forest, fruit trees and ornamental plants. Insecticides are successful to reduce population of this pest, but they cause environmental pollution. In this study, the virulence efficacy of B. bassiana wasdetermined on the fourth instar larvae of H. cunea under laboratory conditions. 1×106 and 1×108 conidial suspensions of B. bassiana grew at 20, 25 and 30°C temperatures. 1×108 conidial suspensions of B. bassiana were the most efficacious in controlling larvae of H. cunea at sprayingmethod, especially at 25°C with 100 % mortality after 9 days of treatment. 1×108 conidial suspensions of B. bassianamore efficacious in controlling larvae of H. cunea at 20 and 30°C (61% and 74%) than 1×106 conidial suspensions of B. bassiana at 20, 25 and 30°C (23%, 66% and 28%) after 9 days of treatment. This study showed that isolate of B. bassianahas virulent and highly potential for biological control on larvae of H. cunea.