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Abscission of Flowers and Fruits in Phaseolm vulgaris L. I. Cultivar Differences in Flowering Pattern and Abscission ¹

Developmental patterns and abscission of flowers and pods were studied in greenhouse and field experiments with three cultivars of dry beans (Phaseolus vulgaris L.). The pattern of flower production, pod retention, number of flowers produced, and percentage of reproductive structures abscised varied with cultivar. The pattern of flower production varied from a concentrated skewed pattern for cultivar ‘Seafarer’ to a longer and more normally distributed pattern for cultivar ‘Black Turtle Soup’. In general, the first-formed flowers had the highest probability of setting pods and producing mature seed.

Key Words: Pod retention pattern • Dry bean

² Formerly graduate assistant, presently lecturer, Dep. of Horticulture, Kasetsart Univ., Bangkok 9, Thailand; professor, Crop Science; and formerly post doctoral research associate, presently assistant professor, Agronomy Dep., Univ. of Kentucky, Lexington, respectively. Dep. of Crop and Soil Sciences, Michigan State Univ., East Lansing, M1 48824.

Received for publication April 23, 1977.