Resistência de cultivares de alfafa à antracnose e à mancha de leptosphaerulina em Uberlândia-MG

Abstract

In view of the importance of alfalfa as fodder for the production of high quality hay, it was evaluated the susceptibility of 27 cultivars to diseases of the shoot as well as progress of the disease in the region of Uberlândia-MG. The diseases were diagnosed: anthracnose (Colletotrichum trifolii Bain & Essary) and Leptosphaerulina leaf spot (Leptosphaerulina briosiana (Pollaci) JH Graham & Luttrel). The results showed that cultivars BR1, MONARCA, SUTTER, MARICOPA, BR4, SW821O, 5929 and MH15 more resistant to damage from leptosferulina. Cultivars ARAUCANA, IC1990, MH15 and SW8112A were resistant to anthracnose. Cultivars Maricopa is not presented ICI990 defoliation. The study showed a significant simple correlation between severity of anthracnose and percentage of defoliation. During the adjustment of the disease progress curves for the Leptosphaerulina leaf spot, the model adjusted was the square.