GreenCast in Australia - Tech Notes Issue 3

Tech Notes Issue 3

Dollar Spot (Sclerotinia homoeocarpa). Active between 15 and 30 C under high humidity and/or dew. Cool season turfgrasses susceptible at this time.		Pythium blight (Pythium spp.) is most severe under wet humid conditions with high temperatures (30-35 C) and warm nighttime temperatures (> 20 C)
Gray leaf spot (Pyricularia grisea) occurs under humid conditions when temperatures range between 28-32 C. In the US associated with Lolium perenne, but can attack kikuyugrass		Take-all patch (Gaeumannomyces graminis var. avenae) occurs on new or young creeping bentgrass turf. Generally associated with high pH rootzone mixes.
Brown Patch (Rhizoctonia solani) occurs under warm humid conditions primarily at this time on cool season turfgrasses. Most active when nighttime temperatures remain above 21 C.		Root decline of warm season turfgrasses (G. graminis var. graminis) is similar to take-all but occurs under cloudy warmer conditions on both new and old turf.
Summer patch (Magnaporthae poae) occurs at temperatures between 28 –35 C. Highly destructive on Poa pratensis and Poa annua		Curvularia (Curvularia spp.) is primarily a problem on ultradwarf couchgrass. It occurs under high temperatures and cloudy wet conditions.