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1 April 2014 Suppression of Hop Looper (Lepidoptera: Noctuidae) by the Fungicide Pyraclostrobin
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Abstract

The hop looper, Hypena humuli Harris, is a reemergent pest of hop that often requires treatment to mitigate crop damage. In 4 yr of field trials, plots treated with fungicides were observed to sustain less hop looper defoliation compared with nontreated plots. Further investigation revealed that abundance of hop looper and associated defoliation were reduced when the fungicide pyraclostrobin was applied in late July to early August.Twoother fungicides possessing active ingredients in thesamechemical family (quinone outside inhibitor) did not reduce abundance of hop looper or its defoliation. Pyraclostrobin is efficacious against powdery mildew diseases, and the application timing evaluated in these studies corresponds with a period of juvenile susceptibility of hop cones to the disease. Use of fungicides containing pyraclostrobin at this time may have the ancillary benefit of reducing hop looper damage, potentially obviating the need for broad-spectrum insecticides later in the season. Follow-up studies are warranted to determine whether pyraclostrobin may inhibit other lepidopteran species.

© 2014 Entomological Society of America
J. L. Woods and D. H. Gent "Suppression of Hop Looper (Lepidoptera: Noctuidae) by the Fungicide Pyraclostrobin," Journal of Economic Entomology 107(2), (1 April 2014). https://doi.org/10.1603/EC13546
Received: 12 December 2013; Accepted: 1 February 2014; Published: 1 April 2014
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