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1 April 2014 Sustainable Management Tactics for Control of Phyllotreta cruciferae (Coleoptera: Chrysomelidae) on Canola in Montana
Gadi V.P. Reddy, Khanobporn Tangtrakulwanich, Shaohui Wu, John H. Miller, Victoria L. Ophus, Julie Prewett
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Abstract

The crucifer flea beetle, Phyllotreta cruciferae (Goeze) (Coleoptera: Chrysomelidae), has recently emerged as a serious pest of canola (Brassica napus L.) in Montana. The adult beetles feed on canola leaves, causing many small holes that stunt growth and reduce yield. In 2013, damage to canola seedlings was high (≈80%) in many parts of Montana, evidence that when flea beetles emerge in large numbers, they can quickly destroy a young canola crop. In the current study, the effectiveness of several biopesticides was evaluated and compared with two insecticides (deltamethrin and bifenthrin) commonly used as foliar sprays as well as seed treatment with an imidacloprid insecticide for the control of P. cruciferae under field conditions in 2013. The biopesticides used included an entomopathogenic nematode (Steinernema carpocapsae), two entomopathogenic fungi (Beauveria bassiana and Metarhizium brunneum), neem, and petroleum spray oils. The control agents were delivered in combination or alone in a single or repeated applications at different times. The plant-derived compound neem (azadirachtin), petroleum spray oil, and fatty acids (M-Pede) only showed moderate effect, although they significantly reduced leaf injuries caused by P. cruciferae and resulted in higher canola yield than the untreated control. Combined use of B. bassiana and M. brunneum in two repeated applications and bifenthrin in five applications were most effective in reducing feeding injuries and improving yield levels at both trial locations. This indicates that entomopathogenic fungi are effective against P. cruciferae, and may serve as alternatives to conventional insecticides or seed treatments in managing this pest.

© 2014 Entomological Society of America
Gadi V.P. Reddy, Khanobporn Tangtrakulwanich, Shaohui Wu, John H. Miller, Victoria L. Ophus, and Julie Prewett "Sustainable Management Tactics for Control of Phyllotreta cruciferae (Coleoptera: Chrysomelidae) on Canola in Montana," Journal of Economic Entomology 107(2), 661-666, (1 April 2014). https://doi.org/10.1603/EC13503
Received: 20 November 2013; Accepted: 1 February 2014; Published: 1 April 2014
JOURNAL ARTICLE
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KEYWORDS
biopesticide
Brassica napus
entomopathogen
Phyllotreta cruciferae
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