![]() ![]() It is also why we see turf damage caused by Pythium diseases track with water movement, e.g., drainage areas, mowing patterns, etc.Īmong the Pythium diseases, Pythium blight (a.k.a. That is why a common factor in Pythium disease development is the presence of water or high moisture, e.g., wet, water-saturated soils or long periods of high humidity or leaf wetness. That is why most fungicides that control Pythium do not usually give control of other diseases.įurthermore, Pythium belongs to the Oomycota, which are called “water molds” for a reason: Pythium and other oomycetes need a lot of water to grow and reproduce effectively. Wong, Ph.D., Bayer CropScienceĪlthough we often classify Pythium as a ‘fungus’ it’s not a true fungus in the sense that it is actually in a different kingdom (Chromista) and, biologically, shares more in common with algae than true fungi that cause other diseases like brown patch and dollar spot (kingdom Fungi). Diseased turf will have an orange to black greasy appearance and will produce fluffy white mycelia after an overnight incubation in a moist container. Pythium blight is easy to identify and diagnose. Of the various Pythium diseases, Pythium blight and Pythium root rot are of the highest concern under high temperatures. Summer is here and hot days and warm nights can bring on Pythium as a major threat to cool season turfgrasses. Centraalbureau voor Schimmelcultures, Baarn, The Netherlands.Frank Wong, Ph.D., is part of the Bayer Green Solutions Team. Van Der Plaats-Niterink, A.J., 1981: Monograph of the genus Pythium, Studies in Mycology Vol. Woolhouse, 1989: Fungal diseases of amenity turf grasses. American Phytopathological Society Press, St Paul, MN, USA. Clarke, 2005: Compendium of turf grass diseases. Soika, 1988: Metalaxyl resistance frequency in overwintering population of Pythium aphanidermatum from metalaxyl control failure sites. Soika, 1990: Laboratory- induced resistance to fosetyl-al in a metalaxyl-resistant field isolate of Pythium aphanidermatum. Sanders, P.L., 1987: Failure of metalaxyl to control Pythium blight on Kentucky golf courses. Sanders, P.L., 1984: Failure of metalaxyl to control Pythium blight on turf grass in Pennsylvannia. Cohen, 1980: Development of resistance to metalaxyl in Pseudoperonospora cubensis. Kim, 2004: Species of Pythium from greenhouses in Pennsylvania exhibit resistance to propamocarb and mefenoxam. Mocioni, M., 2001: Prodotti fitosanitari registrati per ls’impiego su tappeto erboso in Italia: situazione e prospettive. Malattie fungine, nemici animali ed infestanti. Alma, 2000: La difesa dei tappeti erbosi. Grigoriu, 1981: Metalaxyl-resistant strains of Pseudoperonospora cubensis in cucumber greenhouses of Southern Greece. Coffey, 1984: Studies on the in vitro and in vivo antifungal activity of fosetyl-Al and phosphorous acid. ![]() Mckay, 2003: Host range of P ythium sulcatum and the effects of rotation on Pythium diseases of carrots. Van Der Wal, 1981: Occurrence of metalaxyl-resistant trains of Phytophthora infestans in Dutch potato fields. Phytopathology 65, 1094–1100.īurpee, L.L., 2005: Sensitivity of Colletotrichum graminicola to phosphonate fungicides. Lumsden, 1975: Factors affecting production and germination of oospores of three Pythium species. Lipman, 1997: Gapped BLAST and PSI-BLAST: a new generation of protein database search programme. ![]()
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