the foliage rating of disease showed that treatments includ¬
ing benomyl were significantly better than those without
benomyl, regardless of other fungicides employed. This sug¬
gested that pythiaceous fungi were not involved in root
rot of these plants. When the ratings for the roots and the
foliage were compared, the coefficient of correlation was
0.83, indicating that there was a moderate correlation be¬
tween the condition of the foliage and that of the roots. In
two other similar tests the coefficients of correlation were
0.68 and 0.48. The plants used in each of these tests were
large and the correlation between disease ratings of the
foliage and roots quite variable.
The next series of tests involved comparisons of benomyl
to other fungicides to identify the optimum for control of
Cylindrocladium root rot. All plants used in these tests were
produced from pathogen-free seedlings and inoculated arti¬
ficially. Benomyl generally provided superior control com¬
pared to each of the fungicides tested (Tables 2 and 3).