Field Evaluation of Promising Breeding Lines and Varieties of Common Bean for Tolerance to Soilborne Pathogens
G.S. Abawi; T.G. Porch; J.D. Kelly
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A poster presented at the 2012 Global Pulse Researchers Meeting, Kigali, Rwanda- “Transforming Grain-Legume Systems to Enhance Nutrition and Livelihoods”. Abstract: The objectives of this study was the identification and incorporation of sources of
resistance to major root pathogens into adapted bean varieties being developed in the collaborative Dry Grains Pulses CRSP project. The use of varieties resistant to the prevailing root pathogens is the most effective and practical strategy in the control of root disease of common bean. Field trials of promising lines from the breeding programs of Drs. Kelly and Porch were evaluated in the bean root rot nursery at the Vegetable Research Farm, NYSAES near Geneva, NY over a three year period. This site is heavily infested with Fusarium solani f. sp. phaseoli, Pythium ultimum, Rhizoctonia solani, and Thielaviopsis basicola. In 2011, 33 lines and varieties were arranged in a randomized block design with 4 replications. Each plot consisted of two rows, 7 m long and 0.75 m apart. Seeds were treated with recommended fungicides (Apron + Maxim) and an insecticide (Cruiser). All maintenance practices were according to recommended commercial guidelines. Root rot severity, among the lines tested varied greatly, ranging from 3.4 [10IS-6567, P07863, B04554 (Zorro)] to 6.0 (CLRK) on the 1 (healthy) to 9 (late stages of decay) scale. Also, many of the tested lines exhibited excellent
vigor, productivity and high tolerance to a severe incidence of common bacterial blight, including P07863, RR008, RR016, RR005, and 10IS-6480.