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Selection for Resistance to Xanthomonas phaseoli in Dry Beans¹

Seedling and adult resistance in dry beans (Phaseolus vulgaris L.) to Xanthomonas phaseoli (E. Smith) Dows. was evaluated on field and greenhouse plants of F₄ families derived from two susceptible x resistant crosses. Over 90% of the variation among disease scores of field-grown families was attributable to the regression on scores of greenhouse-grown seedlings. Two greenhouse inoculation methods, leaf-clipping and water-soaking, accurately predicted field resistance of families. The greenhouse comparison of seedlings and flowering plants revealed that the differences among families were much greater than the interaction of families with developmental stage.

Heritability of disease severity in greenhouse tests, estimated by parent-offspring regression (F₂/F₃) was comparable for both inoculation methods. Correlation estimates of 0.27 for leaf-clipping and 0.28 for water-soaking were obtained when P.I. 207262 was the resistant parent. A gression estimate of 0.62 was obtained for the heritability of disease severity after leaf-clipping inoculation when ‘Jules’ was the resistant parent, indicating plant selection from crosses with Jules would be effective for identification of resistant lines.

Key Words: Common blight • Disease resistance • Screening for resistance • Phaseolus vulgaris L.

² Bean and pea breeder, P.O. Box 1235, Twin Falls, ID; bean breeder and bean pathologist, respectively, CIAT, Colombia, S.A.

Received for publication July 30, 1979.