Submitted to: Meeting Abstract
Publication Type: Abstract Only
Publication Acceptance Date: May 1, 2011
Publication Date: N/A
Technical Abstract: The European pear sawfly, Hoplocampa brevis (Klug), is a relatively new pest in the Mid-Atlantic fruit production region. A plot containing twelve Pyrus communis pear cultivars and one breeder’s selection in a randomized block design was surveyed for fruit damage. Infestation frequency ranged from 0% for ‘Wenatchee Gold Bosc’ to 25% for US76128-009. A collection of 47 genetically diverse pear cultivars and breeders’ selections was also surveyed. Escape due to early flowering may account for the lack of infestation in four P. ussuriensis clones, one P. pyrifolia cultivar, and one interspecific hybrid. However, early flowering was not a factor for the other clones. Genotypes of pure Pyrus communis ancestry mostly exhibited high degrees of infestation (up to 48%), while most of those genotypes with no or low degrees of infestation were P. ussuriensis or P. pyrifolia, or interspecific hybrids with P. communis. Among P. communis clones, ‘Maxine’ and NJ A2 R27 T97 exhibited infestation of 6% and 7%, respectively.