Evaluation of Parental Cultivars., from the Pedigrees of Apple Clones with the Cultivar Sonora as an Ancestor, for European Red Mite (Acari: Tetranychidae) Preference

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The cultivars 'Early McIntosh,' 'Melba,' 'Red Rome,' 'Starr,' and 'Williams' were evaluated for Panonychus ulmi (Koch) preference. These cultivars have been intermittently present as parents of a group of apple selections which had 'Sonora' as a common parent. We confirmed the previous theoretical finding of their suitability as hosts for P. ulmi. Two parents, 'Sonora' and USDA 34, from this group, were not available for testing. Other parents, 'Crimson Beauty,' 'Jonathan,' 'Petrel,' 'Red Melba,' 'Rome Beauty,' and 'Wealthy,' not previously subjected to pedigree analysis because of their less frequent presence as parents, also were found to be suitable hosts when evaluated for ERM preference. Among this latter group of cultivars, 'Early Redbird' and 'Kildare' were unavailable for testing. The lack of contribution of single major genes for resistance to P. ulmi, determined by an analysis of the expected frequency of genetic contribution of the parents, was confirmed. This method of analysis may be useful in identifying parents contributing heritable traits in crops such as apples when many of the older parents are unavailable for testing.

Document Type: Research Article

Publication date: February 1, 1984

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