Effects of Inoculum Concentration on the Apparent Resistance of Watermelons toFusarium oxysporumf. sp.niveum

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Abstract
The apparent wilt resistance of watermelon (C. lanatus) cultivars to F. oxysporum f. sp. niveum was dependent on the concentration of initial inoculum. Four wilt resistance rankings were established: susceptible (> 80% wilt), slightly resistant (51-80% wilt), moderately resistant (21-50% wilt), and highly resistant (.ltoreq. 20% wilt). Wilt resistance rankings for most cultivars usually dropped one level as inoculum concentration increased logarithmically. Two cultivars, ''Dixielee'' and ''Smokylee'', remained highly resistant up to inoculum levels of 1 .times. 106 conidia/ml. Populations of F. oxysporum f. sp. niveum recovered from soil indicated that planting wilt-susceptible cultivars tends to increase the pathogen population in the soil, whereas planting cultivars highly resistant to wilt decreases it.

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