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Dale T. Lindgren and Daniel M. Schaaf

Documenting the successful interspecific crosses in a genus is a valuable tool in making decisions in developing strategies for plant breeding activities. However, summarizing the breeding and hybridization can be confusing because of incomplete or lost breeding records and the failure to register the parentage of new cultivar names. A summary of interspecific crosses in the genus Penstemon at the University of Nebraska–Lincoln West Central Research and Extension Center over 10 years provides insight into both successful and unsuccessful crosses. The results, based on seed production and percent of successful crosses, would suggest that interspecific crosses are more likely to be successful when the parent species are more closely related.

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Dale T. Lindgren, Glenn Viehmeyer and Roger Uhlinger

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Dale T. Lindgren and Daniel M. Schaaf

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Dale T. Lindgren and Dermot P. Coyne

Differences in potato leafhopper (Empoasca fubae Harris) injury symptoms were noted in 22 cultivars or lines of dry beans (Phaseolus vulgaris L.) in a 1991 field trial at North Platte, Neb. Seed yield, biomass, and plant injury symptoms were recorded. The same 22 dry bean cultivars or lines were planted in a split-plot design, with main plots protected (sprayed with insecticide) vs. unprotected (not sprayed) and cultivars or lines as subplots in 1992 and 1993. Significant differences were observed between cultivars/lines for leafhopper injury and yield in all 3 years. `Tacaragua' (black-seeded) and pinto `Sierra' were highly resistant to leafhoppers, with no visual leafhopper injury symptoms in all 3 years. Significant negative correlation coefficients between leafhopper injury symptoms and yield were recorded in the protected (4.50) and unprotected (-0.33) plots in 1993 but only in the unprotected (-0.46) plots in 1992. A cultivar x spray interaction response to leafhoppers occurred in 1992 but not in 1993. The degree of leafhopper injury symptoms varied between years.

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Dale T. Lindgren and Daniel M. Schaaf

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Dale T. Lindgren, Daniel M. Schaaf and Kim Todd

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Dale T. Lindgren, Daniel M. Schaaf and James Locklear

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Dale T. Lindgren, Kent M. Eskridge, James R. Steadman and Daniel M. Schaaf

Severity of rust (Uromyces appendiculatus) and yield of dry edible beans (Phaseolus vulgaris L.) were recorded for 9 years in west-central Nebraska in fungicidal efficacy trials. A weighted analysis of covariance was used to estimate yield loss due to rust. The model fit the data well (R2=0.94), and the slope over all years had a 19 kg.ha−1 decrease in yield for each 1% increase in severity of rust. Yield response within years occurred only through reduction of rust for most fungicide treatments.

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Dale T. Lindgren, Dermot Coyne, David Nuland, Ralph B. Clark and Dan Schaaf

Color (chlorosis) of eight dry bean cultivars was measured using a Chlorophyll Meter at 5 sites over 2 years in western Nebraska to determine color differences due to cultivars, site, year and iron treatments. There were significance differences between cultivars for color at all sites. However, cultivars were not consistent in color response to iron treatments across all sites. `Spinel' and `Othello' were classified as having darker green foliage while `Steuben Yellow Eye' and `Redkloud' were classified as having lighter green foliage. Correlations between foliage color and yield were greater on sites with higher pH. Selections can be made for bean lines which consistently have darker green foliage color. However, they are not always the highest yielding lines.