ISHS Acta Horticulturae 630: XXVI International Horticultural Congress: Nursery Crops; Development, Evaluation, Production and Use
THE POTENTIAL OF BREEDING FOR RESISTANCE TO THE INTRODUCED PEST, VIBURNUM, LEAF BEETLE (PYRRHALTA VIBURNI) |
| Authors: | W.A. Hoch, B.H. McCown, P.A. Weston |
| Keywords: | Viburnum carlesii, Viburnum lantana, invasive pests |
| Abstract:
AbstractThe viburnum leaf beetle, (Pyrrhalta viburni), a European native insect, has now become established in the Northeastern US and Eastern Canada. This beetle presents a serious threat to both native and non-native Viburnum species in the North American landscape. Although all North American native species of Viburnum are susceptible to this insect, significant resistance is present in several Asiatic species. These species may be potential sources of resistance to the leaf beetle in breeding programs for new ornamental selections. A segregating F2 population resulting from a wide-cross between the highly resistant V. carlesii and the susceptible V. lantana was screened for resistance to the leaf beetle. Bioassays consisted of no-choice feeding trials on moistened filter paper in petri dishes using single adult leaf beetles. Feeding was determined by scanning and digitally analyzing the leaf area consumed. This population displayed great variation in leaf beetle resistance/susceptibility, including significant transgressive segregation for this trait. This study indicates that considerable potential exists for the use of interspecific crosses to create ornamental Viburnum clones possessing high levels of resistance to P. viburni. | |
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