DISEASE AND FUNGICIDE MANAGEMENT IN SOYBEAN
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1 DISEASE AND FUNGICIDE MANAGEMENT IN SOYBEAN Heather M. Kelly Field Crops Plant Pathologist West Tennessee Research and Education Center University of Tennessee
2 Disease Pyramid 1. Plant susceptible variety 2. Pathogen influenced by field history, location, etc. 3. Environment promotes disease development For yield loss to be an issue 4. Time all 3 factors have to occur at a critical time/growth stage
3 Potential Yield Savings with Fungicide based on Cultivar Susceptibility
4 Variety Selection - UTcrops.com resources 2015 Maturity Group V Data Summary from 7 County Tests Summary from Small Plot Research MS Brand/Variety Yld RECM - YLD Frogeye Other Lodging JAX - YLD Frogeye Other Lodging bu/a *Treated Non-treated RECM Diseases RECM *Treated Non-treated JAX Diseases JAX A Dyna-Gro S52RY75 RR2Y LOW BS LOW SC 1 AB Progeny P5213 RR2Y LOW SC MOD SC, TS, CLB 0 ABC Armor 50-R21 RR MOD SC, SDS 0 ABC Terral REV 55R MOD 2 ABC Steyer 5002 R LOW MOD SC, TS 0 ABC Dyna-Gro 32RY55 RR2Y LOW SDS 1 ABC Croplan R2C 5225S HIGH 0 ABC Asgrow AG5335 GENRR2Y/SR MOD BS HIGH 0 ABC Terral REV 52A LOW SC, BS LOW 4 ABC Asgrow AG5233 GENRR2Y/SR HIGH HIGH 0 ABC Armor AR5205 RR HIGH HIGH 0 ABC *USG 75J23R HIGH SC 0 BC Mycogen 5N501R2 RR LOW SC, TS LOW SC, TS 1 C Hornbeck RY 5221 RR2Y LOW CLB LOW TS, CLB 1 C Beck's 511R HIGH HIGH 1 Average (bu/a) Treated vs Non-treated Yields (Quadris TOP at 8 fl oz/a) RECM Severe to moderate FLS disease pressure (55% QoI resistance) as well as other diseases JAX Severe FLS disease pressure (95% QoI resistance) WTREC low to moderate FLS disease pressure (68% QoI resistance), planted after wheat Other Diseases: SC=Stem Canker, TS=Target Spot, SDS = Sudden Death Syndrome, CLB = Cercospora Leaf Blight
5 Potential Yield Savings with Fungicide based on Cultivar Susceptibility LOW
6 Know the disease your managing for
7 Soybean Diseases Frogeye Leaf Spot (FLS) Cercospora sojina
8 Frogeye Leaf Spot (FLS) Fungicide Resistance FLS fungus (Cercospora sojina) has become resistant to QoI/Strobilurin fungicides Label look up at cdms or Agrian websites
9 QoI Fungicide Resistance in TN *Free testing for fungicide resistance For information go to UTcrops.com Soybean Disease and Nematode section
10 Fungicide Resistance Influenced by: Mode of action of the fungicide (single site or multi-site) Biology of the pathogen (high rates of reproduction = higher risk to develop fungicide resistance) Fungicide use pattern (frequent, exclusive usage of at-risk fungicides increase risk of resistance development) Cropping system (practices that increase disease pressure also increase risk of resistance development)
11 Fungicide Resistance: The Assessment of Risk Product Name Quadris, Evito, Headline, Pristine Quadris Top, Priaxor (combos) Caramba, Tilt, Maneb, Captan, Bravo, Chloronil, Defiant Fungicide Risk Pathogen Risk From
12 Fungicide Groups created by the Fungicide Resistance Action Committee (FRAC) Based on fungicides cross resistance behavior
13 Foliar Fungicides Chemical classes and Fungicide Resistance Action Committee (FRAC) codes ( Quinone outside inhibitors (QoI; strobilurin) FRAC 11 Demethylation inhibitors (DMI; triazoles) FRAC 3 Succinate dehydrogenase inhibitors (SDHI) FRAC 7 Methy benzimidazole carbamates (MBC) FRAC 1 Multi-site contact activity (i.e. chloronitriles) FRAC M5
14 FRAC Group High Risk: 11 and 1 Fungicide Resistance: The Assessment of Risk Product Name Quadris, Evito, Headline, Pristine High to Medium Risk: 7 Priaxor (combo) Medium Risk: 3 Caramba, Tilt, Low Risk: M5 Maneb, Captan, Bravo, Chloronil, Defiant Fungicide Risk Pathogen Risk From
15 Fungicide Resistance Influenced by: Mode of action of the fungicide (single site or multi-site) Biology of the pathogen (high rates of reproduction = higher risk to develop fungicide resistance) Fungicide use pattern (frequent, exclusive usage of at-risk fungicides increase risk of resistance development) Cropping system (practices that increase disease pressure also increase risk of resistance development)
16 Fungicide Use Pattern Follow label rate and achieve good coverage Avoid multiple sprays of fungicides in the same fungicide group Use combination products for single applications in a season Alternate solo products/fungicide groups when applying more than one application in a season Use best fungicide to manage the specific disease(s) in your field and only apply when justified (based on disease risk and scouting)
17 UTcrops.com
18 Managing Fungicide Use One of the important tools to manage disease Will not cure existing disease symptoms Use best fungicide to manage the specific disease(s) in your field Applications should be based upon: Disease risk Scouting observations Consistent economic benefits are more likely when based upon: Disease risk and Scouting observations
19 Resistant Management Strategies are Good Disease Management Strategies Use ALL the tools for disease management: Crop rotation Proper soil fertility Resistant varieties ID disease problems Use best matched jjjfungicide Apply fungicide when justified Achieve good coverage Use combo products and/or alternate between solo products/fungicide groups Monitoring resistance levels in pathogen populations Manage fungicides effectively before resistance becomes a problem
20 Thank you for your attention! Questions? Heather Kelly
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