Wednesday, 20 November 2002

This presentation is part of : Display Presentations, Subsection Fa. Host Plant Resistance

Resistance of Viburnum accessions to feeding by viburnum leaf beetle, Pyrrhalta viburni

Paul A. Weston1, Maria Derval Diaz1, Gaylord Desurmont2, Brent H. McCown3, and William A. Hoch3. (1) Cornell University, Department of Entomology, 150 Insectary, Ithaca, NY, (2) ENESAD, 21800 Quetigny, Dijon, France, (3) University of Wisconsin, Department of Horticulture, 1575 Linden Dr, Madison, WI

Viburnum leaf beetle [(Pyrrhalta viburni (Paykull)], a newly introduced pest of viburnums in the U.S., feeds selectively on plants in the genus Viburnum. We measured in the laboratory the ability of larvae to complete development and propensity of adults to feed on a number of species of Viburnum ranging in susceptibility from completely susceptible to quite resistant as determined by earlier field observations, and on hybrids resulting from a cross between a susceptible and a resistant Viburnum species. As expected, larvae completed development on viburnums rated as “susceptible,” but were largely unable to do so on those rated as “moderately” or “highly” resistant. The pattern of host acceptance by adults was less consistent, with some adults feeding considerably on species not found to be susceptible in the field. Several accessions were not fed on at all by adults, indicating the presence of deterrent or toxic factors. Hybrids ranged in susceptibility from very susceptible to very resistant, indicating segregation of the factors contributing to resistance. Our results suggest that the species previously identified as resistant in the field are unsuitable hosts for viburnum leaf beetle, and will not likely be devastated by the pest even if all susceptible hosts are eliminated from an area. In addition, results from the experiments with hybrid viburnums indicate that at least some factors conferring resistance result from monogenic traits, and may be manipulated fairly easily with conventional breeding techniques.

Species 1: Coleoptera Chrysomelidae Pyrrhalta viburni (viburnum leaf beetle)
Keywords: host plant resistance, feeding

Back to Display Presentations, Subsection Fa. Host Plant Resistance
Back to Posters
Back to The 2002 ESA Annual Meeting and Exhibition