Apparent Systemic Effect ofColletotrichum truncatumandC. lagenariumon the Interaction Between Soybean andC. truncatum

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Abstract
Laboratory studies were conducted to determine whether the interaction between soybean [Glycine max] cotyledone and Colletotrichum truncatum (causal agent of soybean anthracnose), C. lagenarium (a cucumber pathogen), and heat-killed C. lagenarium spore suspensions interferred with the interaction between the soybean epicotyl and C. truncatum. Cotyledon treatments, injection with spore suspensions of C. truncatum, C. lagenarium, and heat-killed C. lagenarium, affected the size of lesions that developed on epicotyls inoculated with C. truncatum. Epicotyl lesions were significantly smaller than the control when the cotyledons were injected 24-96 hr before epicotyl inoculation with C. truncatum. Epicotyl lesions were not significantly different in size when the cotyledon treatments and epioctyl inoculation occurred simultaneously. Lesions rarely developed on epicotyls inoculated C. truncatum when cotyledons had been previously treated with heat-killed C. lagenarium. The cotyledon treatments protected the epicotyl against C. truncatum.