Managing Foliar Diseases in Louisiana Cotton
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1 Managing Foliar Diseases in Louisiana Cotton LATMC 2/18/216 Trey Price
2 Trials & Locations 214, Regional Target Spot Project (NERS & MRRS) 7 Foliar Fungicide Type, Rate, and Timing Trials at DLRS & MRRS 215 Regional Target Spot Project (NERS & MRRS) 6 Foliar Fungicide Type, Rate, and Timing Trials at DLRS, MRRS, and NERS
3 Target Spot Corynespora cassiicola
4 Target Spot Distribution - 214
5 Target Spot Distribution - 215
6 Rainfall 214,215 Chase, LA 4.5 Rainfall (in.) (1 in. Total) 215 (2.5 in. Total) Jul 3-Jul 5-Jul 7-Jul 9-Jul 11-Jul 13-Jul 15-Jul 17-Jul 19-Jul 21-Jul 23-Jul 25-Jul 27-Jul 29-Jul 31-Jul 2-Aug 4-Aug 6-Aug 8-Aug 1-Aug 12-Aug 14-Aug
7 Average Temperatures 214,215 Chase, LA Temperature ( F) Temp 214 (79.4 Average) 65 Temp 215 (84.8 Average) 6 1-Jul 8-Jul 15-Jul 22-Jul 29-Jul 5-Aug 12-Aug
8 Fungicide Trial, DLRS, Alexandria, LA, 214 Lint Yield (lbs/a) * Incidence (%) Yield * Disease Incidence (%) 1 st wk bloom 3 rd wk bloom D&PL 1133 DLCT141
9 Fungicide Trial, DLRS, Alexandria, LA, 214 Lint Yield (lbs/a) * * Disease Incidence (%) Incidence (%) Yield 1 st wk bloom 3 rd wk bloom PHY 499 DLCT142
10 Fungicide Trial, MRRS, Winnsboro, LA, TARGET SPOT Lint Yield (lbs/a) a b cd ab c cd cd d AUDPC (Defoliation) 1 st wk bloom only AUDPC (Defol) Yield 1 st and 3 rd wk bloom (2 applications) PHY 499 MRCT146
11 Future Research Needs Target Spot Repeat target spot field trials in 216 (NERS, MRRS, and DLRS). Need more information on fungicide efficacy, yield loss, and economic feasibility. Plan to inoculate in 216. Conduct basic epidemiology research with Corynespora cassiicola (dew period, optimum temperature, inoculum concentration, light effects?, PGR effects?. Toxins? etc.). Relate defoliation timing with yield loss (early, mid, and late season).
12 Cotton Diseases - Leaf Spot Complex Alternaria Stemphylium Cercospora Ascochyta Drought Potassium deficiency Crop injury May be resistant varieties MOST OF THE TIME COSMETIC ISSUE
13 Fungicide Trial, MRRS, Winnsboro, LA, 214 Lint Yield (lbs/a) * * * * AUDPC 1 st wk bloom 3 rd wk bloom BLOOMING PERIOD AUDPC Yield D&PL 1137 MRCT141
14 Fungicide Trial, MRRS, Winnsboro, LA, 214 Lint Yield (lbs/a) * * * AUDPC (-9) 1 st wk 3 rd wk 5 th wk 7 th wk BLOOMING PERIOD AUDPC (-9) Yield STV 5289 MRCT149
15 DuPont Fungicide Trial, MRRS, Winnsboro, LA, a 9 CLSC (-9) Yield 8 Lint Yield (lbs/a) b ab ab b CLSC (-9) Nontreated Headline (9) Fontelis (1 pt) Fontelis (1.5 pt) Fontelis (3 pt) FF + 14 FF + 14 FF + 14 FF+7+14 PHY 499 MRCT156
16 Future Research Needs - CLSC Develop more information on fungicide efficacy with screening and timing trials. Will applications pay? Determine disease severity at which CLSC will affect yield. Basic epidemiological research (K effect). Why are these diseases so prevalent now? Are there resistant varieties?
17 Bacterial Leaf Blight (Angular leaf spot)
18 Bacterial Leaf Blight (Angular leaf spot)
19 Bacterial Leaf Blight (Angular leaf spot)
20 Bacterial Leaf Blight Distribution - 214
21 Handful of Resistant Varieties Deltapine 1133 Fibermax 174 Fibermax 958 Phytogen 375 Stoneville 5288 Source: Mississippi State OVTs
22 Future Research Needs - BLB Further define disease distribution in Louisiana. Develop and initiate a greenhouse variety screening protocol to ID resistant varieties. Identify and develop cultural practices that may aid in disease management. We need up-to-date information on optimum temperatures, dew periods, methods of spread, etc to be able to predict outbreaks.
23 Selected Accomplishments P. Price Bacterial blight (Angular leaf spot) observed in Louisiana cotton fields. Web Blog. P. Price, M. A. Purvis, and H. Pruitt Fungicide and application timing effects on target spot of cotton in Louisiana, 214. Plant Dis. Manag. Rep. 9:FC11. P. Price, M. A. Purvis, H. Pruitt, and J. B. Guice. The effect of selected fungicides and application timings on target spot of Louisiana cotton, 214. Plant Dis. Manag. Rep. 9:FC12. H. L. Mehl, P. Price, et al Regional evaluation of one and two applications of registered and experimental fungicides for the management of target spot on two cotton varieties. Proc. Beltwide Cotton Conf. P. Price, M. Purvis, H. Pruitt, and J. Bartleson Effect of fungicide and application timing on target spot in Louisiana. Proc. Beltwide Cotton Conf. P. Price, M. Purvis, and H. Pruitt Effect of fungicide and application timing on target spot. Phytopathology 15(Suppl. 2)S2.9. P. Price and R. Singh First report of target spot caused by Corynespora cassiicola in Louisiana. doi:1.194/php-br We have extended results of this research via many producer meetings, field days, and other activities throughout cotton producing areas in the state.
24 Myra Purvis Thanks to Cooperators! Brandi Woolam Hunter Pruitt Jerry Bartleson Warren Ratcliff Darrell Franks Daniel Stephenson Donnie Miller Dan Fromme David Kerns Scott Washam Producers Consultants Industry Raj Singh
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