Abstract
Gibbago trianthemae, the causal agent of leaf spot on horse purslane, was isolated from diseased plants collected in Brazos County. TX, [Texas, USA] in 1984. Plants sprayed with conidia at 1 .times. 103 spores/ml or more were killed within 9 days. In host-range studies, the fungus was pathogenic only to horse purslane and not to 18 other crop and weed species in 11 plant families. Results of both pathogenicity and host-range studies demonstrate that this fungus may be a useful agent for the biological control of horse purslane.

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