Crosby 2012 nacaa poster
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ASSESSMENT OF EARLY EMERGENT FUNGICIDE APPLICATIONS FOR IMPROVED WHITE MOLD CONTROL IN PEANUTS Crosby, Phillip M. 1 ; Kemerait, Robert C. 2 1 Georgia Extension Service, University of Georgia, Swainsboro, GA 30401 2 Department of Plant Pathology, University of Georgia, Tifton, GA 31793 Abstract Management of soilborne diseases in peanuts is a major challenge for producers across Southeast Georgia. Management strategies vary based on variety, rotation, crop and environmental conditions and RX disease programs. Fungicide programs targeting the suppression of White mold are typically initiated 60 days after planting following the current recommendation of the University of Georgia. Extremely hot soil temperatures in May of 2010 required re-examination of the soilborne disease management strategy. Georgia 06-G peanut were planted on May 16 th in Midville, Georgia. Using randomized, complete block design with 4 replications, a research protocol was established to evaluate soilborne fungicides applied at 30 and/or 45 days after planting verses the traditional 60 day window. Plots were sprayed using a tractor mounted sprayer that covered 4 rows. Plots were 4 rows wide by 40 feet long. At 60 and 90 days after planting, all plots (except the untreated check) were sprayed with 18 ounces of Abound. Two applications of Bravo completed the fungicide treatments. Peanuts were inverted on October 12 th . Roots and pods were evaluated to determine the number of hits per 40 foot of row. The center 2 rows were harvested, bagged and weighed on October 26 th . Data showed a significant yield increase on treatments 1 and 4 which had Tebuconazole applied at 45 DAP when compared to the untreated check. Methods On May 16 th ,Georgia 06-G peanuts were planted at the Southeast Georgia Research and Education Center in Midville, Georgia. Plots were laid out using a randomized, complete block design with 4 replications for each of 7 treatments. Treatments included (#1) Chlorothalonil (Bravo) at 30 days after planting (dap) followed by Tebuconazole at 45 dap; (#2) Chlorothalonil at 30 dap and 45 dap; (#3) Tebuconazole at 30 dap followed by Chlorothalonil at 45 dap; (#4) Tebuconazole at 30 dap followed by Tebuconazole at 45 dap; (#5) Prothioconazole (Proline) at 30 dap followed by Chlorothalonil at 45 dap; (#6) an Untreated Check; and (#7) Pyraclostrobin and Prothioconazole applied at 40 dap. All plots, except the Untreated Check, were sprayed with an application of 18 ounces of Abound at 60 and 90 days after planting, with an application of Chlorothalonil at 75, 105 and 120 days days. Dr. Kemerait rated all treatments for leaf spot (a common foliar disease of peanuts which can be limited or prevented with these same fungicides) prior to digging. He then rated all plots for White mold after peanuts were inverted. Summary Data gathered from this research program indicated that there was a statistical yield increase when Tebuconazole was applied at 45 days after planting when compared to the Untreated Check.. There was no statistical difference when Tebuconazole was applied at 45 DAP verses the traditional 60 day application date. Yet yield increases of 495 and 381 pounds may encourage some farmers to apply a soilborne (Tebuconazole) earlier than what is traditionally recommended. . Treatment Yield Leaf spot Fla. 1-10 White mold (Avg. hits per 40 ft row) 1. Chlorothalonil @ 30 DAP + Tebuconazole @ 45 DAP 7611 a 1.4 12 b 2. Chlorothalonil @ 30 DAP + Chlorothalonil @ 45 DAP 7116 ab 1.3 9 b 3. Tebuconazole @ 30 DAP + Chlorothalonil @ 45 DAP 7352 ab 1.3 13 ab 4. Tebuconazole @ 30 DAP + Tebuconazole @ 45DAP 7497 a 1.4 9 b 5. Proline @ 30 DAP + Chlorothalonil @ 45 DAP 7278 ab 1.3 13 ab 6. Untreated Check 6650 b 1.5 21 a 7. Pyraclostrobin + Prothioconazole @ 40 DAP 7321 ab 1.5 11 b Lsd= 833 Lsd = .34 Lsd = 9.7 Heavy White Mold Damage No White Mold Damage
Transcript of Crosby 2012 nacaa poster
ASSESSMENT OF EARLY EMERGENT FUNGICIDE APPLICATIONS FOR IMPROVED WHITE MOLD CONTROL IN PEANUTS
Crosby, Phillip M.1; Kemerait, Robert C.2 1Georgia Extension Service, University of Georgia, Swainsboro, GA 30401
2Department of Plant Pathology, University of Georgia, Tifton, GA 31793
Abstract Management of soilborne diseases in peanuts is a major challenge for producers across Southeast Georgia. Management strategies vary based on variety, rotation, crop and environmental conditions and RX disease programs. Fungicide programs targeting the suppression of White mold are typically initiated 60 days after planting following the current recommendation of the University of Georgia. Extremely hot soil temperatures in May of 2010 required re-examination of the soilborne disease management strategy.
Georgia 06-G peanut were planted on May 16th in Midville, Georgia. Using randomized, complete block design with 4 replications, a research protocol was established to evaluate soilborne fungicides applied at 30 and/or 45 days after planting verses the traditional 60 day window. Plots were sprayed using a tractor mounted sprayer that covered 4 rows. Plots were 4 rows wide by 40 feet long.
At 60 and 90 days after planting, all plots (except the untreated check) were sprayed with 18 ounces of Abound. Two applications of Bravo completed the fungicide treatments.
Peanuts were inverted on October 12th. Roots and pods were evaluated to determine the number of hits per 40 foot of row. The center 2 rows were harvested, bagged and weighed on October 26th.
Data showed a significant yield increase on treatments 1 and 4 which had Tebuconazole applied at 45 DAP when compared to the untreated check.
Methods On May 16th,Georgia 06-G peanuts were planted at the Southeast Georgia Research and Education Center in Midville, Georgia. Plots were laid out using a randomized, complete block design with 4 replications for each of 7 treatments. Treatments included (#1) Chlorothalonil (Bravo) at 30 days after planting (dap) followed by Tebuconazole at 45 dap; (#2) Chlorothalonil at 30 dap and 45 dap; (#3) Tebuconazole at 30 dap followed by Chlorothalonil at 45 dap; (#4) Tebuconazole at 30 dap followed by Tebuconazole at 45 dap; (#5) Prothioconazole (Proline) at 30 dap followed by Chlorothalonil at 45 dap; (#6) an Untreated Check; and (#7) Pyraclostrobin and Prothioconazole applied at 40 dap. All plots, except the Untreated Check, were sprayed with an application of 18 ounces of Abound at 60 and 90 days after planting, with an application of Chlorothalonil at 75, 105 and 120 days days. Dr. Kemerait rated all treatments for leaf spot (a common foliar disease of peanuts which can be limited or prevented with these same fungicides) prior to digging. He then rated all plots for White mold after peanuts were inverted. Summary
Data gathered from this research program indicated that there was a statistical yield increase when Tebuconazole was applied at 45 days after planting when compared to the Untreated Check.. There was no statistical difference when Tebuconazole was applied at 45 DAP verses the traditional 60 day application date. Yet yield increases of 495 and 381 pounds may encourage some farmers to apply a soilborne (Tebuconazole) earlier than what is traditionally recommended. .
Treatment Yield
Leaf spot Fla. 1-10
White mold
(Avg. hits per 40 ft
row)
1. Chlorothalonil @ 30 DAP + Tebuconazole @ 45 DAP 7611 a 1.4 12 b
2. Chlorothalonil @ 30 DAP + Chlorothalonil @ 45 DAP 7116 ab 1.3 9 b
3. Tebuconazole @ 30 DAP + Chlorothalonil @ 45 DAP 7352 ab 1.3 13 ab
4. Tebuconazole @ 30 DAP + Tebuconazole @ 45DAP 7497 a 1.4 9 b
5. Proline @ 30 DAP + Chlorothalonil @ 45 DAP 7278 ab 1.3 13 ab
6. Untreated Check 6650 b 1.5 21 a
7. Pyraclostrobin + Prothioconazole @ 40 DAP 7321 ab 1.5 11 b
Lsd= 833
Lsd = .34 Lsd = 9.7
Heavy White Mold Damage No White Mold Damage
