To suit
our purpose better, the scale was modified as follows: grade
1 = leaf without lesions; 2 = 1 to 10%of leaf area infected
(LAI); 3 = 11 to 25% LAI; 4 = 26 to 50% LAI; and 5 = more
than 50% LAI. Plants with scores from 1 to 3 were considered
resistant, and those which scored 4 and 5 were considered
susceptible.