BMPs for the Control of Summer Patch on Annual Bluegrass Turf. Bruce B. Clarke, Ph.D. Rutgers University
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1 BMPs for the Control of Summer Patch on Annual Bluegrass Turf Bruce B. Clarke, Ph.D. Rutgers University
2 Summer Patch Causal Organism : Magnaporthe poae Susceptible Hosts : Annual Bluegrass Kentucky Bluegrass Fine Fescue Bentgrass Poa annua Poa pretensis Festuca spp. Agrostis spp.
3 PATCH DISEASES Caused by Ectotrophic Root-Infecting (ETRI) Fungi
4 PATCH DISEASES / ROOT PATHOGENS Bermudagrass Decline Kikuyugrass Decline Necrotic Ring Spot Spring Dead Spot Summer Patch Take-All Patch
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6 Peter Dernoeden
7 Richard Smiley
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12 IDENTIFICATION AND BIOLOGY OF THE FUNGUS
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17 Conditions Favoring Summer Patch Hot, Humid Weather Excessive Soil Moisture Low Mowing Height Soil Compaction / Poor Drainage
18 Impact of Cultural Practices on Summer Patch Development Compaction Nitrogen fertility Soil and rhizosphere ph
19 COMPACTION
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21 Effect of Compaction/Aerification on Summer Patch Severity Aerificatio n Dp: S Dp: S & F Dp: F Sh: S Sh: S & F Sh: F None Compaction HVY (4X) HVY MOD (4X) MOD (2X) Non (2X) Comp Mean Significant Difference = 3 inches
22 Sources of Nitrogen Urea Sulfur - Coated Urea Ammonium Sulfate Ammonium Chloride Calcium Nitrate ½ Potassium Nitrate ½ Nutralene ½ Nitroform ½
23 Patch Severity Amonium SCU Nitrate Meth. Urea Urea UTC Jul 22-Jul 7-Aug 22-Aug Rating Date
24 No N
25 4 lb N/M Ca NO 3 Thompson, et. al., 1998
26 4 lb N/M AS Thompson et. al, 1998
27 Acidification of Soil by Nitrogen Source 4 lb N/1000 sq. ft / year
28 Suppression of summer patch symptoms with Disease severity Index (dia. X intensity) Ammonium Sulfate - Rutgers University Baron Kentucky Bluegrass 1.5 inch height 2004 Aug. 30 Sep. 14 Sep. 21 Untreated Ammonium sulfate 0.2 lb N at onset of symptoms * = Means are significantly different according to the Waller-Duncan k-ratio t-test (k=100). *
29 Summer Patch Management Aerify and Improve Drainage Raise Mowing Height during Heat Stress Overseed with Perennial Ryegrass, Tall Fescue, or Bentgrass Fertilize with Ammonium Sources, SCU; Avoid using Nitrate Source Maintain ph at or Below 6.0 Apply Pentrant Fungicides (2-4 gal water)
30 Question : Can acidifying nitrogen fertilizers reduce fungicide rate? Answer : Yes. It may, however, can take two to three years to occur.
31 Influence of N Form and Fungicide Rate on Summer Patch Severity Lynx AS Banner Sentinel Check High Rate Low Rate Lynx Urea Banner Sentinel Check % Disease Lynx 25DF 1.32/0.66; Banner 1.1E 4/2 fl oz; Sentinel 40WG 0.25/0.12 oz. Bent/Poa Green, Little Mill, CC, Marlton, NJ.
32 Evaluation of Fungicides for the Control of Summer Patch
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34 Control of Summer Patch I DMIs : - Banner, Bayleton, Eagle, Trinity, Triton, Tourney, Torque II Benzimidazoles : - Cleary 3336 III Strobilurins (QoI): - Compass, Disarm, Heritage, Insignia - Headway and Tartan IV Carboximides: Xzemplar (fluxapyroxad)
35 Summer Patch Control: (QoI left & Check right) Kentucky bluegrass
36 % Disease Control of Summer Patch on Kentucky Bluegrass Banner 2.0 fl oz 14d Heritage 0.2 oz 14d Heritage 0.4 oz 28d Insignia 0.5 oz 28d Ammonium Sulfate 0.2 lb N once Daconil Ultrex 3.2 oz 14d Untreated Check Aug 17-Aug 28-Aug 9-Sep Rating Date Rutgers 2002
37 Suppressing Summer Patch with Selected fungicides on Kentucky Bluegrass : Rutgers University : 2011 Lexicon Intrinsic 4.17SC = Insignia + fluxapyroxad, Xzemplar 2.5SC = fluxapyroxad; Interval = 28 day
38 Effect of Fungicides on Summer Patch Kentucky Bluegrass : Rutgers, 2011* Disease severity index / plot *Fungicides applied from May 27 to August 15, every 14 d
39 Companion microbial inoculant contains Bacillus subtilis GB03 (> 1.5 x CFU/L); Heritage 50WG 0.4 oz / 1,000 sq ft every 14-d; 3.9 cm cutting ht Suppression of Summer Patch by the Biological Control Product Companion on Kentucky Bluegrass Turf 1999
40 Summer Patch Gallonage Study 2 gallons water / 1000 sq ft 5 gallons water / 1000 sq ft 10 gallons water / 1000 sq ft Fairway Study 3 yrs
41 Summer Patch Control Gal Water 10 Gal Water % Disease Banner Fungo 50 Tersan 1991 Cleary 3336 Control
42 Summer Patch Chemical Control DMIs, Benzimidazoles, Strobilurins, and certain Carboximides Use full label rates 3 times / season in areas with a history of summer patch Apply in 2-4 gal water / 1000 ft 2 or Irrigate mmediately after spraying Timing Soil temp. 65 o 2 depth for 5 to 7 consecutive days
43 Any Questions?
BMPs for the Control of Summer Patch on Annual Bluegrass Turf. Bruce B. Clarke, Ph.D. Rutgers University
BMPs for the Control of Summer Patch on Annual Bluegrass Turf Bruce B. Clarke, Ph.D. Rutgers University Summer Patch Causal Organism : Magnaporthe poae Susceptible Hosts : Annual Bluegrass Kentucky Bluegrass
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