Anthracnose of Xanthium Spinosum - Quantitative Disease Assessment and Analysis.

Abstract
A sensitive disease assessment and analysis technique was developed for anthracnose of the weed Xanthium spinosum caused by Colletotrichum orbiculare. Time to plant death was used to discriminate between treatments. The disease rating scale reflected disease progression patterns rather than static symptoms. The mean daily rating in all treatments up to the point in time when, in one treatment, 50% of the plants were dead (MR50) was the most appropriate form of analysis. MR50 analysis scores may have a more widespread application in disease assessment, especially when screening potential mycoherbicides.

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