As part of the University of California Turf Disease Diagnostic Lab services, a weekly report is being sent out to update clients of current disease outbreaks in California and nearby locations with a focus on diseases of golf course turf. The update will be sent out on a weekly basis. This update is still a working version, if you have comments about how it can be changed or improved, please e-mail me your suggestions. If you receive duplicate messages, please let me know.

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Outlook and Summary: June 22, 2009

Anthracnose appears to be starting to pop up more frequently in the diagnostic lab. It could signal the start of the anthracnose season already.

For perennial ryegrass, the presence of anthracnose often signals low fertility, heat and drought stress. Here, anthracnose is usually just a secondary pathogen affecting stressed turf. It usually does not warrant control directly, but does often indicate that cultural conditions need improvement in these areas.

On creeping bentgrass, we typically see anthracnose on greens that are “lean and mean”, especially when there is high humidity and overcast days. Again, in these cases, anthracnose is usually not the primary cause of damage but does signal that fertility needs to be increased and plant stress reduced. Typically, shutting anthracnose down with a fungicide application or two followed by increasing the fertility will solve the issue.

On annual bluegrass though, anthracnose is a real killer because its often the disease that puts the nail in the coffin for Poa greens.

Check out our presentation on chemical control options for anthracnose here:

http://www.turfpathology.ucr.edu/Downloads/anthracnose_chemical_control.pdf

as well as cultural management practices for anthracnose management

http://www.turf.rutgers.edu/research/usga-anthracnose.pdf

For inland areas – it looks hot and dry; perfect conditions for anthracnose and summer patch. While coastal locations will continue to have conditions ripe for dollar spot, brown ring (Waitea) patch and rapid blight.

Help Us Help You. Please Fill Out Those Sample Information Sheets

Please make sure to download and fill out the sample information forms when sending in diagnostic samples.

Our updated sample submission page is at:

http://turfpathology.ucr.edu/Diagnostics/sample_instructions.htm

Quick Weekly Forecast

Location

Highs (F)

Lows (F)

Soil Temps (6-inch)

Outlook

Possible Major Diseases

(CIMIS location )

Min

Max

Min

Max

(F)

(Weather Based)

Fresno (80)

102

Anthracnose Foliar Blight, Dollar Spot, Pythium Blight, Rapid Blight, Rhizoctonia Blight on Cool Season Turfgrass, Rhizoctonia Sheath and Leaf Spot, Southern Blight, Summer Patch, Waitea Patch

Irvine (174)

Dollar Spot, Rapid Blight, Rhizoctonia Blight on Warm Season Turfgrass, Waitea Patch

Los Angeles (133)

Dollar Spot, Rapid Blight, Rhizoctonia Blight on Warm Season Turfgrass, Waitea Patch

Monterey (19)

Anthracnose Basal Rot, Pink Snow Mold, Rhizoctonia Blight on Warm Season Turfgrass, Take-All Patch, Waitea Patch, Yellow Patch

Palm Springs (118)

106

Anthracnose Foliar Blight, Pythium Blight, Rhizoctonia Blight on Cool Season Turfgrass, Rhizoctonia Sheath and Leaf Spot, Summer Patch

Riverside (44)

Anthracnose Foliar Blight, Dollar Spot, Rapid Blight, Rhizoctonia Blight on Cool Season Turfgrass, Rhizoctonia Sheath and Leaf Spot, Southern Blight, Summer Patch, Waitea Patch

Sacramento (131)

101

Anthracnose Foliar Blight, Dollar Spot, Rapid Blight, Rhizoctonia Blight on Cool Season Turfgrass, Rhizoctonia Sheath and Leaf Spot, Southern Blight, Summer Patch, Waitea Patch

San Diego (173)

Dollar Spot, Rapid Blight, Rhizoctonia Blight on Warm Season Turfgrass, Waitea Patch

San Francisco (na)

Anthracnose Basal Rot, Dollar Spot, Pink Snow Mold, Rapid Blight, Rhizoctonia Blight on Warm Season Turfgrass, Take-All Patch, Yellow Patch, Waitea Patch

San Jose (132)

Dollar Spot,Rapid Blight, Rhizoctonia Blight on Cool Season Turfgrass, Southern Blight, Summer Patch, Waitea Patch

San Luis Obispo (52)

Dollar Spot, Rapid Blight, Southern Blight, Summer Patch, Waitea Patch

Santa Barbara (107)

Dollar Spot, Rapid Blight, Rhizoctonia Blight on Warm Season Turfgrass, Waitea Patch

Key to weather: S = sunny, MS= mostly sunny, PC = partially cloudy, C = cloudy, W = windy, Sh = showers, Rn = rain, T-S = thunderstorms, / = mixed weather

Sample	Date Received	Location	Host	Disease	Abiotic Problems
193	6/12/09	El Dorado	Perennial ryegrass, annual bluegrass	Helminthosporium leaf spot, anthracnose, Leptosphaerulina blight	Low fertility
194	6/12/09	Santa Clara	Annual bluegrass, Creeping bentgrass	Take-All Patch
195	6/16/09	Calaveras	creeping bentgrass	Foliar anthracnose	Low fertility
196	6/17/09	Alameda	Annual bluegrass, Creeping bentgrass	Rapid Blight, Anthracnose	Low fertility
197	6/17/09	Santa Clara	Annual bluegrass	Algae	Black Layer, High salts
198	6/17/09	San Joaquin	Ryegrass	Minor ETRI
199-200	6/18/09	Contra Costa	Annual bluegrass, Creeping bentgrass	Waitea Patch	Low fertility
201-202	6/18/09	Riverside	Bermudagrass	Bermudagrass Decline	Low fertility
203	6/18/09	Snohomish (WA)	Annual bluegrass	Waitea Patch, ETRI	Low fertility
204-205	6/17/09	Santa Clara	Creeping bentgrass	Anthracnose	Dry spot
206-207	6/12/09	Monterey	Creeping bentgrass	Algae, Take-All Patch	High salinity