Efficacy of Beauveria bassiana for control of Tribolium castaneum with reduced oxygen and increased carbon dioxide
2009
Lord, J.C.
This study investigated the effect of atmosphere modification, a widely adopted means of insect control in stored products, on the efficacy of Beauveria bassiana for one of the most difficult to control pests, Tribolium castaneum. Oxygen reduction to 5% (±1%) as opposed to CO₂ elevation to 40% (±2%) for the first 72 h of fungus exposure resulted in significantly greater larval mortality than fungus exposure under ambient atmospheres. Both treatments reduced pupation of older larvae suggesting that slowed development may be a beneficial factor for fungal efficacy. CO₂ elevation but not O₂ reduction significantly affected the mortality of adult beetles that were exposed to the fungus. Carbon dioxide elevation significantly reduced B. bassiana's germination and growth rates, but oxygen reduction did not.
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