Wednesday, 20 November 2002

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

Pear germplasm resistance to arthropod pests

Waheed Bajwa and Marcos Kogan. Oregon State University, Integrated Plant Protection Center (IPPC), 2040 Cordley Hall, Corvallis, OR

Twelve pear varieties in three groups: 1. commercial U.S. varieties, 2. European varieties, and 3. Asian varieties were screened for resistance against codling moth, leafrollers, and pest mites. Surveys conducted during the 2000 and 2001 growing seasons assessed pest population trends on each of the varieties. Pest incidence and abundance on the genotype provided a measure of the genotype’s susceptibility. Asian varieties (Kosui, Nijisseiki, Tse Li, Sion Szu) were most susceptible to two-spotted and McDaniel spider mites,and the commercial varieties Bartlett, Anjou, Bosc, and Comice were susceptible to Eriophyids. All groups showed similar susceptibility to leafrollers. Both Asian and the European varieties Ubileen Gift, Spina Carpi, Helmershus Roda, and wild type Pyrus communis showed some level of resistance to codling moth. Among the commercially grown varieties in Oregon, Bartlett was the most and Anjou the least susceptible to codling moth infestation.

Species 1: Lepidoptera Tortricidae Cydia pomonella (codling moth)
Species 2: Acari Tetranychidae (spider mites)
Keywords: pear varieties, pear resistant varieties

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