ABSTRACT
Severity of powdery mildew (Erysiphe polygoni) on twelve common bean cultivars was evaluated during spring season of 1993/94, summer season of 1993 and 1994, and autumn-winter season of 1993 and 1994 at different localities at São Paulo State, Brazil. Two experiments were carried out, one without and another with chemical control. The experimental design was a randomized block with twelve treatments (cultivars) with four replications. The twelve studied cultivars were: Carioca, IAC-Carioca, Aeté, Aysó, Pintado, Jalo, EMGOPA 201-Ouro, IPA6, IAPAR-14, IAPAR-31, IAPAR-44, FT-120 and LM-30380 line. The disease severity was evaluated using a scale varying from 1 to 5. The data were analyzed using Tukey at the 5% level. The lessaffected cultivars were IAC-Carioca, IAPAR-44 and the most susceptible ones were Jalo and Pintado, both belonging to the 'Manteiga' Group, no matter the season or locality studied.
KEY WORDS:
Bean; cultivars; powdery mildew; Erysiphe polygoni, disease control.