Presentation is loading. Please wait.

Presentation is loading. Please wait.

Turfgrass Disease Trends in California and the Western United States Naveen Hyder & Frank Wong Department of Plant Pathology & Microbiology University.

Similar presentations


Presentation on theme: "Turfgrass Disease Trends in California and the Western United States Naveen Hyder & Frank Wong Department of Plant Pathology & Microbiology University."— Presentation transcript:

1 Turfgrass Disease Trends in California and the Western United States Naveen Hyder & Frank Wong Department of Plant Pathology & Microbiology University of California, Riverside

2 Background information California has the largest turf and landscape industry in the US (approx. 15 billion) Approx. 950 golf courses in the state of California – 2 nd in the US Not much information available due to lack of turfgrass pathology program since the1990s

3 Objective To assess turfgrass disease trends in California and the Western United States based on diagnostic laboratory data What are the major disease problems? What are the major hosts? What are the disease trends over the last four years? Where should research efforts be focused?

4 Materials and methods A sample = 1 cup cutter size plug of plants and soil For this study 1 data point = one pathogen/plant interaction Data based on diagnostic samples received Samples are not evenly distributed throughout the Western United States Multiple samples from the same location Data collected from (present)

5 Collecting a data point Microscopic signs >>> incubate up to hrs Isolation from tissue Leaves, roots and crown on pathogen specific media

6 Turf Management for Golf Courses 2001 J. Beard

7 Common turfgrass species used in California and the Western U.S. Cool Season (C3 Photosynthesis) Poa annua Poa trivialis Agrostis stolonifera Festuca arundinacea Festuca rubra Lolium perenne Warm Season (C4 Photosynthesis) Cynodon spp. Pennisetum clandestinum Paspalum vaginatum Stenotaphrum secundatum

8 Geographic origin (based on # of samples received) Arizona72113 California389 (85%)366 (80%)235 (77%)402 (79%) Colorado13111 Hawaii4665 Idaho3167 Nevada23 (5%)40 (9%)28 (9%)25 (5%) Oregon Texas2103 Utah1332 Washington20 (4%)17 (4%)12 (4%)31 (6%) n = 460n = 457n = 306n = 512

9 Sources of samples (based on number of samples received) Residential/ commercial landscape 8715 Sports turf Golf courses 438 (95%) 439 (96%) 283 (92%) 477 (93%) Sod farms 3-12 n = 460n = 457n = 306n = 512

10 Most common turfgrass hosts Data based on n= 3,360 diagnosis

11 Poa annua (Annual bluegrass) diseases trends Top 5 from 2006 to (442) *2007 (425) *2008 (471) *2009 (358) * Algae (17%)Rapid Blight (11%)Anthracnose (14% )Anthracnose (18%) Summer Patch (15%)Anthracnose (11%)Rapid Blight (13%)Rapid Blight (8%) Rapid Blight (9%)Summer Patch (9%)Algae (12%)Algae (8%) Brown Ring Patch (9%) Summer Patch (8%) Anthracnose (8%)Algae (6%)Brown Ring Patch (5%) Michrodochium Patch (6%) * Total annual bluegrass samples processed Algae (Cyanobacteria) = Oscillatoria spp. Anthracnose = Colletotrichum cereale Brown Ring Patch = Waitea circinata var. circinata Rapid Blight = Labyrinthula terrestris Summer Patch = Magnaporthe poae Michrodochium Patch = Michrodochium nivale

12

13

14 Agrostis stolonifera (Creeping bentgrass) disease trends Top 5 from (263) *2007 (201) *2008 (185) *2009 (187) * Algae (24%)Take-All Patch (23%)Algae (10%)Anthracnose (18%) Take-All Patch (21%)Algae (10%)Take-All Patch (10%) Take-All Patch (14%) Fairy Ring (5%)Anthracnose (6%) Algae (11%) Anthracnose (5%)Fairy Ring (4%)Pythium Blight (5%) Fairy Ring (6%) Pythium Blight (3%) Rhizoctonia Brown Patch (4%) Rhizoctonia Brown Patch (5%) * Total creeping bentgrass samples processed Algae (Cynobacteria) = Oscillatoria spp. Anthracnose = Colletotrichum cereale Fairy Ring = Various Basidiomycete spp. Pythium Blight = Pythium spp. Rhizoctonia Brown Patch = Rhizoctonia solani Take-All Patch = Gaeumannomyces graminis var. avenae

15

16 Lolium perenne (Ryegrass) disease trends Top 3 from (173)*2007 (106)*2008 (61)*2009 (67)* Bipolaris Leaf Spot (15%) Brown Patch (21%) Brown Patch (18%) Anthracnose (39%) Brown Patch (15%) Curvularia Blight (17%) Anthracnose (16%)Brown Patch (15%) Curvularia Blight (14%) Bipolaris Leaf Spot (15%) Summer Patch (7%) Bipolaris Leaf Spot (9%) *Total ryegrass samples processed Anthracnose = Colletotrichum cereale Bipolaris Leaf Spot = Bipolaris spp. Brown Patch = Rhizoctonia solani Curvularia Blight = Curvularia spp. Summer Patch = Magnaporthe poae

17 Cynodon spp. (bermudagrass) disease trends Top 3 from (65)*2007 (21)*2008 (45)*2009 (79)* Spring Dead Spot (23%) Rhizoctonia Large Patch (38%) Bermudagrass Decline (29%) Bermudagrass Decline (35%) Bipolaris Leaf Spot (22%) Spring Dead Spot (28%) Spring Dead Spot (18%) Spring Dead Spot (10%) Bermudagrass Decline (17%) Bipolaris Leaf Spot (14%) Bipolaris Leaf Spot (10%) * Total Bermudagrass samples processed Spring Dead Spot = Ophiosphaerella narmari / O. korrae Bipolaris Leaf Spot = Bipolaris spp. Bermudagrass Decline = Gaeumannomyces graminis var. graminis Rhizoctonia Large Patch = Rhizoctonia solani

18 Pennisetum clandestinum (kikuyugrass) disease trends Top 3 from (28)*2007 (18)*2008 (23)*2009 (14)* Gray Leaf Spot (38%) Kikuyugrass Decline (38%) Kikuyugrass Decline (44%) Rhizoctonia Large Patch (43%) Kikuyugrass Decline (21%) Gray Leaf Spot (16%) Rhizoctonia Large Patch (22%) Kikuyugrass Decline (36%) Rhizoctonia Large Patch (18%) Rhizoctonia Large Patch (16%) Gray Leaf Spot (13%) * Total Kikuyugrass samples processed Gray Leaf Spot = Pyricularia grisea Kikuyugrass Decline = Gaeumannomyces graminis var. graminis Rhizoctonia Large Patch = Rhizoctonia solani AG 2-2

19 Summary Total # of samples received ( ) = 3, % of the samples received are from golf courses 90% of these samples from golf course greens Cool season grasses comprise 85% of the samples 50% of these samples are annual bluegrass # 1 problem on annual bluegrass is Anthracnose

20 Conclusions First effort to summarize data pertaining to turfgrass diseases in the Western United States California has a unique turfgrass disease profile because of diversity of climate zones within the state Top research priority should be cool season turf management esp. diseases of annual bluegrass

21 Future research scope Use the data base to: Compare and contrast information with other regions Correlate disease trends with climatic variations Correlate disease trends with agronomic practices specific to California

22 Acknowledgements GCSAA Environmental Institute of Golf California State GCSAs Syngenta Professional Products Bayer Environmental Sciences


Download ppt "Turfgrass Disease Trends in California and the Western United States Naveen Hyder & Frank Wong Department of Plant Pathology & Microbiology University."

Similar presentations


Ads by Google