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Evaluation of development and production of common beans cultivars under infection of Curtobacterium flaccumfaciens pv. flaccumfaciens

Antonio Carlos Maringoni: São Paulo State University

<div>The bacterial wilt<span>, induced by <em>Curtobacterium flaccumfaciens</em> pv. <em>flaccumfaciens</em> (Cff), is one of the most important disease of common beans in Brazil. The aims of this work were to evaluate the development and agronomic parameters</span> of common beans cultivars resistant (IAC Alvorada, IAC Diplomata and IPR Corujinha) and susceptible (IAC Carioca and Pérola). To this, assays were performed in greenhouse condition. At the first assay, repeated in three times, were evaluated number of pods, grain per pod, mass of one hundred grains, and disease severity on plants inoculated or not with Cff. Disease was evaluated every seven days and the plants were conducted until pods harvest. About the second assay, repeated in two periods, percentage of dry weight reduction of inoculated plants was evaluated in relation to uninoculated at the same cultivars, after 30 days. It was observed that agronomic parameters were directly affected by disease in susceptive cultivars, highlighting the Pérola cultivar, which presented 79.8% losses in mass of one hundred grains. Cultivars IAC Alvorada, IAC Diplomata and IPR Corujinha showed a dry weight reduction of 21.6%, 15.7% and 17.3% respectively. Cultivars IAC Carioca and Perola showed a reduction of 30.3% and 26.3%, respectively. These study showed that resistant cultivars presented less significant losses in the presence of the disease.</div>