Conidial Sampling of Drechslera poae from Kentucky Bluegrass to Determine Role of Mowing in Spore Dispersal. F. W. Nutter, Jr., Former Research Assistant, Department of Plant Pathology, Pennsylvania State University, University Park 16802. H. Cole, Jr., Professor, and R. D. Schein, Professor, Department of Plant Pathology, Pennsylvania State University, University Park 16802. Plant Dis. 66:721-723. Accepted for publication 13 November 1981. Copyright 1982 American Phytopathological Society. DOI: 10.1094/PD-66-721.

Rotorod, Kramer-Collins, and live-plant spore traps were used to determine the seasonal periodicity of dispersal of Drechslera poae conidia. Conidial dispersal was first detected in the spring at the beginning of grass growth or about the time of first mowing. Spore collection reached a maximum in mid-May and by late June had almost ceased. More conidia were detected on days when the turf stand was mowed than on those when the grass was not disturbed. Conidial collection was greatly reduced at heights above 7 cm.

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