Editorial Type:
Article Category: Research Article
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Online Publication Date: 01 Dec 1999

Biorational and Conventional Plant Protectants Reduce Feeding by Adult Japanese Beetles

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Page Range: 203 – 206
DOI: 10.24266/0738-2898-17.4.203
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Abstract

Nine commercial plant protectants were tested for efficacy against feeding by adult Japanese beetles (Popillia japonica Newman). Treatments included an endotoxin from a bacterium [Bacillus thuringiensis (Berl.) var. san diego]; microencapsulated pyrethrum extracted from pyrethrum [Tanacetum cinnerariifolium (Trev.) Schultz-Bip.], two extracts from neem (Azadirachta indica A. Juss); an extract from cayenne pepper (Capsicum annuum L. var. annuum Longum Group); an extract from garlic (Allium sativum L.); rotenone extracted from galedupa (Derris trifoliata Lour.) and barbasco [Lonchocarpus sericeus (Poiret) Kunth] or timbo (L. nicou Aublet D.C.); carbaryl (1-napthyl methylcarbamate); and the pyrethroid, fenpropathrin. Experimental plots were located at the Horticulture Field Laboratory (HFL), Raleigh, and the Mountain Horticultural Crops Research and Extension Center (MHCREC), Fletcher, NC. Himalayan birches [Betula utilis var. jacquemontii (Spach) Winkl.] were used as host plants. Treatments were applied twice, 2 weeks apart. Five weeks after initial application, trees treated with fenpropathrin averaged 2% defoliation vs. 40% defoliation for the control trees at HFL; and 3% defoliation vs. 100% defoliation for the control trees at MHCREC. Rotenone treatments averaged 10% defoliation at HFL and 92% defoliation at MHCREC. The following treatments were not significantly different from the control at week 5 at either location: garlic extract, neem extracts, cayenne pepper extract, microencapsulated pyrethrum, encapsulated bacterial endotoxin, and carbaryl.

Copyright: Copyright, All Rights Reserved 1999

Contributor Notes

This research was funded, in part, by the North Carolina Agricultural Research Service, Raleigh, NC 27695-7609. The authors gratefully acknowledge technical assistance of William M. Reece. This article is from a thesis submitted by J. D. W. in partial fulfillment of the requirements for the M.S. degree.

2Graduate Research Assistant.

3Professor.

4Professor, Department of Horticultural Science, Mountain Horticultural Crops Research and Extension Center, 2016 Fanning Bridge Rd., Fletcher, NC, 28732-9216.

5Professor, Department of Entomology.

Received: 07 Jul 1999
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