First Report of a Labyrinthula sp. Causing Rapid Blight Disease of Rough Bluegrass and Perennial Ryegrass

Plant Disease
M W OlsenW D Gelernter

Abstract

A Labyrinthula sp. was isolated from symptomatic rough bluegrass (Poa trivialis L.) and perennial ryegrass (Lolium perenne L.) from a golf course in Arizona. Initial symptoms were a water-soaked appearance and rapid collapse of small patches of turf foliage. The affected turf died, and patches coalesced to form large dead areas after several weeks. The symptoms were those of the disease recently termed "rapid blight" for which the causal agent has not been identified (1). Rapid blight was first observed in southern California in 1995 and has become increasingly problematic in 10 other states on several cool-season turfgrasses (1). In Arizona, it is associated with high salinity irrigation water. In microscopic examinations of symptomatic P. trivialis and L. perenne leaf tissue from November 2002 to February 2003, fusiform or spindle-shaped vegetative cells (4 to 5 × 15 to 20 μm) were observed in leaf cells. These cells are consistently associated with rapid blight (1) and are typical in size and shape of those described for Labyrinthula spp. (3,4). The fusiform cells were cultured in 1% horse serum water agar medium made with irrigation water (electrical conductivity [EC] = 3.5 to 4.0 dS/m) from a golf course in central Arizona...Continue Reading

Citations

Nov 1, 2007·Molecular Plant Pathology·Mary W Olsen
Nov 30, 2005·The Journal of Eukaryotic Microbiology·Terence M Preston, Conrad A King
Sep 14, 2012·Canadian Journal of Microbiology·Kirthi Kiran YadagiriS Bruce Martin

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