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Genetic control of common bean (Phaseolus vulgaris) resistance to powdery mildew (Erysiphe polygoni) was studied using segregating populations from the bean variety crosses Jalo x ESAL 686 and ESAL 550 x ESAL 686. F2 plants, together with the parents, were inoculated and evaluated using a scale of values from one (plant without symptoms) to nine (completely infected plant). F2 plants were harvested individually, and F2:3 families were obtained. These families were evaluated in an 11 x 11 and 12 x 12 simple lattice statistical design for the Jalo x ESAL 686 and ESAL 550 x ESAL 686 crosses, respectively, using the same value scale as the F2 generation. The segregation observed in F2 plants and F2:3 families indicated that two genes are involved in genetic control, due to a double recessive epistasis. The high linear regression coefficient (b) between F2 plants and their F2:3 family, 0.66 for ESAL 550 x ESAL 686 cross, and 0.71 for Jalo x ESAL 686 cross, showed that the trait is highly heritable. Para estudar o controle genético da resistência ao oídio (Erysiphe polygoni) no feijoeiro foram utilizadas as populações segregantes dos cruzamentos Jalo x ESAL 686 e ESAL 550 x ESAL 686. As plantas F2 desses cruzamentos, juntamente com os parentais, foram inoculadas e avaliadas utilizando-se uma escala de notas de 1 (planta sem sintoma) a 9 (planta completamente infectada). As plantas F2 foram colhidas individualmente e obtidas as famílias F2:3. Essas famílias foram avaliadas nos delineamentos látice simples 11 x 11 e 12 x 12 para os cruzamentos Jalo x ESAL 686 e ESAL 550 x ESAL 686, respectivamente, utilizando-se a mesma escala de notas da geração F2. As segregações observadas nas plantas F2 e nas famílias F2:3 indicam que no controle genético estão envolvidos dois genes, sendo este um caso de epistasia recessiva dupla. O coeficiente de regressão linear (b) entre a planta F2 e sua família F2:3 mostrou que o caráter possui alta herdabilidade