DISEASE RESPONSE OF ANDEAN BREEDING LINES TESTED FOR ASCOCHYTA BLIGHT RESISTANCE

摘要

Ascochyta blight in common bean is caused by the pathogen Phoma exigua var. diversispora (Bubak) Boerema (synonymous with: Phoma diversispora Bubak) and is among the most important fungal diseases of highland production regions of the tropics. Levelsof infestation can be very severe causing 100% yield loss in bush beans In Ecuador, Colombia and Peru among countries of the Andean region of South America and is also important in high elevation areas of Guatemala in Central America. For this reason, climbing beans which outgrow or outlast the disease, which is more prevalent in the rainy season are often grown, especially in mixtures with maize or other crops which tend to limit the spread of the pathogen which lasts for several cycles in the soil.