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United States Department of Agriculture

Agricultural Research Service

Title: Evaluation and Pre-Breeding with New Sources of Resistance to Colorado Potato Beetle and Late Blight

item Hanneman Jr, Robert

Submitted to: American Journal of Potato Research
Publication Type: Abstract Only
Publication Acceptance Date: June 1, 1999
Publication Date: N/A

Technical Abstract: As a part of the joint National Cooperative Enhancement Project, enhancement materials are evaluated for resistance to early blight, late blight, Colorado potato beetle in unsprayed plots and for early dying in an infected plot at the UW Agricultural Research Station at Hancock, Wisconsin. These tests augment routine evaluations for yield, chipping, specific gravity, adaptation, etc. A summary of 1998 field evaluation on over 1000 selections for early blight, Colorado potato beetle and early dying will be reported. A unique haploid x S. pinnatisectum hybrid was evaluated. It exhibits low male and female fertility. Chromosome pairing occurs, but univalents are also present. It displays field resistance to late blight equivalent to its wild species' parent. Haploid x S. berthaultii hybrids exhibited moderate to high resistance to late blight and good agronomic characteristics. Colorado potato beetle resistance was tested among Tuberosum haploid species hybrids of S. bukasovii, S. chacoense, S. raphanifolium, S. sparsipilum, S. tarijense, and S. tuberosum ssp. andigena. Twenty-one families, one backcross, 9 PIs, I I haploids, and 7 cultivars were tested in a 7x7 lattice using Norland as a spreader. S. bukasovii, S. raphan~fblium, and S. sparsipilum families displayed low levels of insect resistance. S. tariiense families exhibited moderate resistance and S. chacoense families showed high resistance. Information such as this will help to continue to lay a firm foundation for utilization of wild species for enhancement and pre-breeding for the 2 1st century.

Last Modified: 4/22/2015
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