Cercospora apii Damage of Celery-Effects of Plant Spacing and Growth on Raised Beds

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Abstract
Damage caused by C. apii on leaves and petioles of celery (Apium graveolens var. dulce) was measured on plants grown at different plant spacings on flat soil and raised beds under conditions that simulated those in commercial production. Infection rates of C. apii were not affected either by plant spacing or by growth on raised beds. In celery plots that received weekly fungicide applications (which were necessary for commercially acceptable disease control) average infection rates (r) ranged from -0.13 to -0.15 throughout the fall season, and 0.17-0.23 in the spring season. Hours of leaf wetness and disease damage measured as percent leaf area infected or as numbers of diseased petioles per plant requiring removal at harvest time did not differ significantly among plant-spacing or bed-height treatments, nor did yields or stalk wt vary significantly among comparable plant populations.

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