THROUGH A GLASS, DARKLY. R. C. Kemerait; Jr. Department of Plant Pathology, The University of Georgia Cotton Incorporated Target Spot Summit
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1 THROUGH A GLASS, DARKLY R. C. Kemerait; Jr. Department of Plant Pathology, The University of Georgia Cotton Incorporated Target Spot Summit
2 Foliar Diseases of Cotton Historically considered incidental for cotton production in Georgia. Various causes- E.g. Cercospora, Stemphylium, Alternaria Stemphylium leaf spot tied to nutrient deficiencies, esp. potassium Wet weather blight (Ascochyta blight) Phoma Typically seen on younger plants Rarely seen today Ascochyta wet weather blight Aereolate mildew Ramularia Sporadic occurrence Aereolate mildew, Appling Trial 2007 Corynespora leaf spot J.P. Jones 1963 Southwest Asia- to Include boll rots
3 Stemphylium Leaf Spot on Cotton Seminole County 2009 Rome Ethredge
4 Leaf Spot Disease in Attapulgus Stemphylium leaf spot 8 September 2009
5 Cercospora Leaf Spot on Cotton Colquitt County 2009
6 Cercospora Leaf Spot on Cotton Colquitt County 2009
7 Fungicides for Foliar Diseases of Cotton Topsin-M Section 18 in Florida Specifically for hardlock May also benefit leaf health Headline (pyraclostrobin) Received Section 3 label in 2007 Single application expected Labeled for foliar disease control Plant Health benefit? Quadris (azoxystrobin) Supplemental label received in July 2008
8 2007 Appling County Fungicide Trial Photograph by Sandy Newell Untreated Plot/Areolate Mildew
9 2007 Appling County Fungicide Trial Photograph by Sandy Newell Pyraclostrobin mid-canopy/areolate Mildew
10 Appling County Fungicide Trial A A A A A LINT (lb/a) Untreated Headline, 6.14 fl oz Caramba, 12 fl oz Quadris, 9.2 fl oz Topsin, 16 fl oz
11 Two shots of Headline (6 fl oz/a) and 0 lb/a vs 180 lb/a potassium Stemphylium leaf spot 2010
12 Cotton Fungicide Studies Tifton, Attapulgus, 2007 Appling Co. 2 (3) Applications beginning at full bloom Value ($/A) compared to control Bottom line- 10 times made a little money, 10 times lost money TIF 2004 AT 2005 TIF 2005 AT 2006 APP 2007 Headline, 6.14 oz Headline, 9.2 oz Quadris, 6 oz Quadris, 9 oz Topsin, 16 oz Topsin, 16 oz (4)
13 In desperation, BOB!! It CAN T all be potassium deficiency
14 Leaf Spot Diseases in Decatur County (likely Corynespora and/or Cercospora) 8 September 2009
15
16 Corynespora cassiicola
17 2010 Attapulgus REC, Decatur County Stemphylium and Corynespora Leaf Spots (Affected leaves only) Fungicide programs analyzed across cotton varieties 10 August LSD= %Leaf Area Affected Headline, 6 fl oz/a Headline, 12 fl oz/a Untreated Fungicide Program
18 2010 Attapulgus REC, Decatur County Stemphylium and Corynespora Leaf Spots Fungicide programs analyzed across cotton varieties Prob(F)= Seed cotton (lb/a) Headline, 6 fl oz/a Headline, 12 fl oz/a Untreated Fungicide Program
19 2010 Thomas County Field stripped with/without Headline 6 fl oz/a RJ Byrne
20 2010 Commercial Grower Trial, Thomas County Corynespora Leaf Spot RJ Byrne, UGA Cooperative Extension 100 P<0.05 % Defoliation Headline, 6 fl oz/a Fungicide Program Untreated
21 2010 Commercial Grower Trial, Thomas County Corynespora Leaf Spot RJ Byrne, UGA Cooperative Extension 1400 P<0.1 Lint (lb/a) Headline, 6 fl oz/a Fungicide Program Untreated
22 Stemphylium leaf spot. Through a glass, darkly Neither disease severity nor defoliation affected by fungicides. Yield not affected by fungicide applications. Disease severity and defoliation significantly affected by pre plant application of potassium but in season foliar application of potassium. Corynespora leaf spot disease Disease severity and defoliation reduced with application of fungicides. Yields increased with application of fungicides, statistically significant (64 lb/a lint) in one trial. Best timing.. Best fungicides. Best recommendations. Best economics. Boll rots.
23 Foliar Diseases of Cotton Historically considered incidental for cotton production in Georgia. Various causes- E.g. Cercospora, Stemphylium, Alternaria Stemphylium leaf spot tied to nutrient deficiencies, esp. potassium Wet weather blight (Ascochyta blight) Phoma Typically seen on younger plants Rarely seen today Ascochyta wet weather blight Aereolate mildew Ramularia Sporadic occurrence Aereolate mildew, Appling Trial 2007 Corynespora leaf spot J.P. Jones 1963 Southwest Asia- to Include boll rots
24 Acknowledgements BASF Calvin Perry Billy Mills Jared walls Michael Foster Lina Young Joy Carter Jeannette Mixon Benji Baldree Jhen Bennett
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