SCREENING COMMON AND TEPARY BEAN GENOTYPES AGAINST TWO ISOLATES OF MA CROPHOMINA PHASEOLINA BY THE CUT-STEM METHOD

摘要

Ashy stem blight (ASB) caused by Macrophomina phaseolina (Tassi) Goidanich (Mp) is an important tropical disease that affects common bean in all growth stages. Resistance has been identified in common (Phaseolus vulgaris L.) and tepary (P. acutifoliusA. Gray) bean gene pools (Miklas et al. 1998). Most of the ASB screening methods in the greenhouse have been conducted in seeds, seedlings, and plants at vegetative stages (Estevez et al., 2014; Pastor-Corrales and Abawi, 1988). However, a reliable screening technique that covers the entire cropping season needs to be assessed. Our objective was to evaluate the response of Phaseolus spp. genotypes to two M. phaseolina isolates throughout the crop season by the cut-stem method.