Study on the Biocontrol Experiment of Porthesia atereta by Beauveria bassiana in the Field
In this paper ,results of biocontrol of Porthesia atereta in Camellia oleifera plants by different Beauveria bassiana formula-tions in the field were reported.The results showed that spraying 108 spores/mL suspension had the best control efficiency.Mortality of P.atereta larva was 92.8%10 days after application ,and the corrected mortality was 91%.In the treatments of the firecrackers of conidia powder ,biocontrol efficiencies between 4 and 6 conidia powder firecracker/sample plot 10 days after application had no sig-nificant difference ,which were 82.4%and 85.3%,respectively.But the biocontrol efficiencies of using 4 and 6 conidia powder fire-cracker/sample plot were significantly higher than that of 2 conidia powder firecracker.The insect densities and increased leaves in-jury rates of C.oleifera on the standard trees after application of different B.bassiana formulations were significantly decreased.The reduction in insect amounts with B ,A3 and A2 treatments were 88.4%,88.6%and 81.5%,respectively.The increased leaves injury rates were 5.3%,6.0% and 8.3%, while that of the control was 21.0%.The results showed biocontrolling of P.atereta using B.bassiana was efficient.
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