2015 Fungicide Update

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1 215 Fungicide Update

2 2 New Fungicides Merivon- BASF Proline- Bayer 1 New Nematicde Nimitz- ADAMA= (formerly MANA) New Labeled Products in 214

3 Non-Fumigant Nematicide Active: Fluensulfone True Nematicde (effective on all nematode species) EC Formulation Signal word Caution Telone EC Warning Vydate L Danger Fruiting Veg (Crop Group 8) Cucurbits (Crop Group 9) 3-5 Pt Rate (7pt Max/Acre/Year) Pre-plant Incorporated or Drip Applied (7day pre plant)

4 214 Tomato Trial Cucumber Trail 1 8 Telone II (12 Gal/A) 6 8 Telone II (12 Gal/A) 6 Nimitz (5 pt/a) PPI 4 2 Galling (Severity) Galling (% Incidence) 4 Nimitz (5.3 pt/a) PPI 2 Galling (Severity) Galling (% Incidence)

5 Strobilurin (Group 11) + SDHI (Group 7) Pyraclostrobin (21.2%) + Fluxapyroxad (21.2%) Similar to (sweet corn + fruiting veg) Pyraclostrobin (28.6%) + Fluxapyroxad (14.3%) Broad Spectrum Fungicide High Risk for Resistance

6 Bulb Vegetables (Onions) Purple Blotch Botrytis neck rot Botrytis leaf blight Downy Mildew Cucurbit Crops Powdery Mildew Gummy Stem Blight Alternaria Anthracnose Target Spot Root Vegetables (not sugar beets) Alternaria, Cercospora, Powdery mildew Leafy Vegetables (not brassicas)

7 a b b def Purple Blotch (Severity) a Botrytis Leaf Blight (Severity) c cd d b Merivon (8 floz/a) b Merivon (11 floz/a) 212 Onion Trial a b Grower Standard Yield (lbs)

8 1 Gummy Stem Blight Severity 8 ab 213 Watermelon Trial bc 6 cd a 4 e e e ab ab 2 cd d d Luna Experience (1floz) Inspire Super (2 floz) Bravo (3pt) Merivon (5.5 floz) Fontelis (1pt) Gummy Stem Blight 214 Watermelon Trial

9 Powdery Mildew Severity 1 a 8 a a a Summer Squash Trial b bc 4 c-e 2 f-h 214 Summer Squash Trial d hi i i Torino Luna Merivon (3.4 floz) Experience (5.5 floz) (1 floz/a) Fontelis (1 pt) Procure (8 floz) Powdery Mildew

10 SUMMARY Onion Diseases: Excellent control on most onion diseases Cucurbit crops Fluxapyroxad provides similar control on Gummy Stem Blight as Fontelis (Penthiopyrad). Activity on Powdery Mildew. Resistance Management is critical. Pyraclostrobin component (Cabrio, Headline) should provide control of Anthracnose, and Alternaria

11 Prothioconazole Group (3) Fungicide (sterol inhibitor) Cucurbit Crops Fusarium Wilt Gummy Stem Blight Powdery Mildew Southern Blight

12 Fusarium wilt % incidence Proline Drench (3 floz) 6 Proline Drench (5.7 floz) 5 6 Quadris Drench (15.4 floz) Quadris Drench (15.4 floz) 5 4 3/25/21 Proline Drench (3 floz) 7 4/6/21 4/18/21 4/8/213 4/18/213 4/28/213 Watermelon Fusarium Wilt Trials (inoculated)

13 214 Summer Squash Trial a bc d d Powdery Mildew Severity (-1) Powdery Mildew Proline (5.7 floz) Torino (3.4 floz) Procure (8 floz)

14 Gummy Stem Blight Severity Gummy Stem Blight Trial (Attapulgus) Gummy Stem Blight Trial (VORC) ab 3 a 2 1 h-k d g-k cd i-k Luna Experience (1 floz) Bravo (3 pt) cd Proline (5.7 floz) Gummy Stem Blight

15 Best Fungicide we have tested against Fusarium Wilt Excellent Activity on Powdery Mildew Good rotation partner Torino on Squash Torino, Quintec on Watermelons and Cantaloupe Has Activity on Anthracnose Excellent Activity on Gummy Stem Blight Resistance management is critical Do not rotate with Tebuconazole products Proline

16 Fungicide Issues Reduced efficacy SDHI Fungicides on Powdery Mildew of Cucurbit crops Tebuconazole resistance in Gummy Stem Blight Downy Mildew Fungicides on Cucurbit crops 214 Disease Management Update

17 Summer Squash Powdery Mildew Trials Area Under Disease Progress Curve # # # Torino Luna Merivon 3.4 floz/a Experience 5.5 floz/a 1 floz/a Fontelis 1 pt/a Pristine 18.5 oz/a Reduced Efficacy of the SDHI (Group 7) Fungicides to Powdery Mildew in Georgia

18 Watermelon Trials Gummy Stem Blight Severity # 213 Attapulgus 214 VORC 214 Attapulgus Luna Inspire Experience Super (1 floz) (2 floz) Bravo (3 pt) Tebuzol (8 floz) Proline (5.7 floz) Triazole insensitivity to Gummy Stem Blight

19 16 Cucumber Downy Mildew AUDPC 14 a 12 1 bc 8 e 6 f 4 2 V-128 (.25 lb ai) Ranman (2.75 floz) Zampro (14 floz) Valent Downy Mildew Trials 211 Trial 212 Trial 213 Trial 214 Trial

20 16 Cucumber Downy Mildew AUDPC # 212 Trial 213 Trial 214 Trial 2 Syngenta Rotation Ranman (2.75 floz) Zampro (14 floz) Omega 5 (16 floz) Syngenta Downy Mildew Trials or # = significantly different than other treatments

21 Summary All of the SDHI Fungicides show lower efficacy for control of Powdery Mildew on Cucurbit Crops Tebuconazole resistance has been found in Gummy Stem Blight. Resistance management is critical. Efficacy of Downy Mildew Fungicides for cucurbit crops may be slipping, though further work is required to clarify. Syngenta expects (a.i. Oxathiapiprolin) to be registered mid-late 215. When available, it will be used with Bravo and not as a solo product. Valent V-128 possible label in Disease Management Update

22 UGA Plant Pathology Black Shank Farm Attapulgus Research and Education Center Vidalia Onion and Vegetable Research Center Eric Goodwin Unessee Hargett Billy Mills Al Brock Lee Hitson William Darley Cliff Riner Randy Hill Denny Thigpen Tifton Vegetable Park County ANR Agents UGA Extension Vegetable Pathology Team Ed Troxell Vegetable Team Tucker Price Eddie Beasley Justin Lanier Chris Tyson Jason Edenfield Chris Earls Bhabesh Dutta Kelly Morris Jason Brock Mike Foster Mike Donahoo Student Workers Thanks

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