Soybean Diseases HEATHER KE LLY E XTENSION/RESEA RCH PLAN T PATHOLOGIST UNIVERSITY OF TEN N ESSEE
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1 Soybean Diseases HEATHER KELLY E XTE N SION/RESEA RCH PLAN T PATHOLOGIST UNIVERSITY OF TENNESSEE
2 Disease Pyramid Factors needed to result in yield loss due to disease PEST 1. Pathogen influenced by field history, location, etc. 2. Environment promotes disease development 3. Susceptible host variety 4. Time all 3 factors have to occur at a critical time/growth stage For yield loss to be an issue
3 Resources UTcrops.com Foliar fungicide efficacy tables for corn, soybean, and wheat (and seed treatment efficacy table for soybean) news.utcrops.com o Get up-to-date reminders and info on field crops throughout the season guide.utcrops.com odisease identification material (also on mobile-friendly field guide site search.utcrops.com osearchable disease ratings and yield on soybean cultivars
4 Incidence (%) Disease Monitoring 2017 Soybean Sentinel plots 12 counties (6 in West, 5 in Middle, and 1 in East TN) Around R3 Septoria brown spot, Frogeye leaf spot, and Downy mildew Late season diseases target spot (R4), Soybean rust (>R5), Cercospora leaf blight (R7) 0 Frogeye Leaf Spot Septoria Brown Spot Soybean Rust Downy Mildew Target Spot Cescospora Leaf Blight R1 R2 R3 R4 R5 R6 R7 R8 Growth Stage
5 2017 Soil Sample Results Limited funding from TSPB for 2017 Screen for population level of soybean cyst nematode, charcoal rot, and sudden death syndrome Hoping for funding for 2018 expand # samples and counties
6 2017 Soil Sample Results Limited funding from TSPB for 2017 Screen for population level of soybean cyst nematode, charcoal rot, and sudden death syndrome Hoping for funding for 2018 expand # samples and counties
7 Mobile-Friendly Field guide.utcrops.com o Soybean Disease o Foliar Diseases o Pod, Stem, & Root Diseases o Seedling Diseases o For each disease: o General Info (short video) o Management Options o Images o Fungicide Resistance (where applicable)
8 Soybean Cultivar Disease Trials o CST varieties evaluated in small, replicated plots a multiple locations (varying disease pressures) with and without fungicide application at R3 o 2017 Frogeye Leaf Spot and Target Spotrated, and presence of Stem Canker, Sudden Death Syndrome, and Cercospora Leaf Blight reported o disease data in searchable o PDFs also UTcrops.com o Larger database is being build by group of specialists
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10 Variety Disease Data Example scenario Should I spray a fungicide on my soybeans? What s the variety and field history? Seeing any disease? variety, AgriGold G4835 RX have it in multiple fields with different histories Based on variety trial data, spraying a fungicide at R3 protected: bu/a 6.5 in severe disease pressure location bu/a 0.9 in moderate disease pressure location bu/a 1.9 in a low disease pressure location (after wheat) Across all locations, average of 3.1 bu/a fungicide response
11 Fungicide Efficacy Table UTcrops.com
12 2017 Fungicide Trials Conducted at 2 to 3 locations Fungicides applied at R3 growth stage Verification 5 highly effective fungicide combinations evaluated across 3 cultivars, varying in disease susceptibility Make Your Own Mix Fungicide combinations compared to pre-mixed fungicide across FLS susceptible cultivar
13 Verification Trials Across all locations, all products significantly protected yield, regardless of cultivar, but analysis by location showed No effect on yield from cultivar or fungicides at low disease pressure location (wheat-beans) Yield (bu/a) Response at Mod-Severe Pressure Location Priaxor+Tilt a Quadris+Tilt+Topsin ab Quadris Top SBX abc Acropolis (domark+topsin) Topguard EQ (quadris+topguard) c bc NTC d Table 3 in report
14 Verification Trials Across all locations, all products significantly protected yield, regardless of cultivar, but analysis by location showed No effect on yield from cultivar or fungicides at low disease pressure location (wheat-beans) Yield (bu/a) Yield FLS Suscept. (bu/a) Response Cultivar -at Mod-Severe Yield Pressure (bu/a) Location FLS Resistant Cultilvar - AG4934, Severe Disease Pressure AG4632, Severe Disease Pressure Priaxor+Tilt Topguard EQ Quadris+Tilt+Topsin Acropolis Quadris Top SBX Quadris+Tilt+Topsin Acropolis (domark+topsin) Priaxor+Tilt Topguard EQ (quadris+topguard) Quadris Top SBX NTC NTC Table 4 in report Table 3 in report a 57.1 a 55.9 a 55.8 a 53.7 a 53.4 b 46.3 Acropolis Quadris+Tilt+Topsin Quadris Top SBX bc NTC c Topguard EQ d Priaxor+Tilt abc ab a b 49.4 b 51.3 b 52.1 b 52.6 b 52.8 a 57.0
15 Fungicide Trials make your own mix Quadris+Domark Quadris+Alto Quadris Non-treated Check Quadris+Topguard Quadris+Tilt Quadris+Tebu Star Quadris+Proline 2016 Milan - Yield (bu/a)
16 Fungicide Trials make your own mix 2016 Jackson - Yield (bu/a) Quadris+Domark a 53.3 Quadris+Tilt (6+3) Quadris+Tilt (4+4) Quadris Quadris+Tebu Star ab 52.0 ab 51.3 ab 50.4 b 49.8 Non-treated Check c
17 Fungicide Trials make your own mix 2017 Yield (bu/a) - across 2 locations Quadris+Topguard Quadrist+Tilt+Topsin Aproach Prima Quadris+Proline Quadris+Domark Quadris+TebuStar Quadris+Tilt NTC * * b 48.6 a 52.8 a 55.2 a 55.0 a 54.3 a 54.3 a 53.9 a 53.9 * Phytotoxicity noted Significantly lower FLS ratings than non-treated
18 Thank you for your attention! Questions? Heather Kelly
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