Reação de cultivares de feijoeiro comum à mancha angular em casa-de-vegetação
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Data
2006-06
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Resumo
Twenty-three common bean (Phaseolus vulgaris) genotypes were tested for reaction to angular leaf spot disease
caused by Phaeoisariopsis griseola in the greenhouse. All genotypes were tested with monosporic isolates Ig 664 and
Ig 669, characterized as pathotypes 63.23 and 63.19, respectively. Fourteen-day-old plants (vegetative stage V3) were
inoculated with a suspension containing 2.5 × 104 conidia/mL. This suspension was applied to the upper and lower leaf
surfaces. Disease symptoms were evaluated 14 and 18 days after inoculation by using a rating scale varying from 1 (no
symptoms) to 9 (≥ 25% of leaf area with angular leaf spot lesions). Culivars BRS Valente, CNFC 10281, CNFP 10138, BRS
Grafite, BRS Requinte, BRS Pontal, MAR 02, Cornell 49-242 and AND 277 showed resistance to both isolates. Cultivars
Carioca Rubi, CNFC 9504, CNFC 10150 and Soberano were susceptible to both pathotypes. Pathotype 63.23 was the most
virulent. The new resistance sources identified in this work could be used in common bean breeding programs aiming to
incorporate resistance to angular leaf spot in new common bean cultivars.
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Resistência genética, Genetic resistance, Phaeoisariopsis griseola, Phaseolus vulgaris
Citação
REIS-PRADO, Fabiana G. et al. Reação de cultivares de feijoeiro comum à mancha angular em casa-de-vegetação. Fitopatologia Brasileira, Brasília, DF, v. 31, n. 3, p. 306-309, 2006.