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Using Ridomil and Quadris Effectively Tobacco Agent Training – June 19, 2009

Using Ridomil and Quadris Effectively Tobacco Agent Training – June 19, 2009. Kenny Seebold Dept . of Plant Pathology. Using Fungicides to Manage Black Shank. Mefenoxam & metalaxyl are the only effective active ingredients (a.i .) on the market at this time

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Using Ridomil and Quadris Effectively Tobacco Agent Training – June 19, 2009

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  1. Using Ridomil and Quadris EffectivelyTobacco Agent Training – June 19, 2009 Kenny Seebold Dept. of Plant Pathology

  2. Using Fungicides to Manage Black Shank • Mefenoxam & metalaxyl are the only effective active ingredients (a.i.) on the market at this time • Ridomil Gold SL (new formulation) or Ultra Flourish • MetaStar EC (same as old Ridomil 2E) • Fungicides won’t provide total control of black shank • Rotation • Resistant varieties (higher resistance = better results & less mefenoxam required) • Tips for success • Incorporate after application • Good soil moisture is needed for activation and uptake • Application scenarios

  3. Pre- or At-Planting Applications

  4. Post-Transplant Applications Use directions for Ridomil Gold SL offer more flexibility to producer With good resistance, application can be delayed until 1st cultivation

  5. Effect of Ridomil Timing on Black Shank of Burley TobaccoAnderson Bros. Farm, Clark Co. - 2008 a bc bc bcd cd cd d A=pre-plant / B=1st cultivation / C=layby

  6. Effect of Ridomil Timing on Black Shank of Burley TobaccoClark Co., 2007 P≤0.05 a ab b a c c bc bc c c c c A=pre-plant B=1st cultivation C=layby

  7. Scenario 1 (no Ridomil) • No fungicide or application costs • KT 206: 2546 lbs./A ROVC = $0.44 • NC 7: 943 lbs./A ROVC = ($0.81) • Scenario 2 (1 pt Ridomil @ 1st cultivation) • $110/A fungicide + $20/A application costs • KT 206: 3131 lbs./A ROVC = $0.64 • NC 7: 2628 lbs./A ROVC = $0.43 • Scenario 3 (1+1+1 pts Ridomil) • $330/A fungicide + $60/A application costs • KT 206: 3035 lbs./A ROVC = $0.51 • NC 7: 3099 lbs.AROVC = $0.53

  8. Target Spot • Severity of target spot was relatively low in 2008 • Yield losses of 25-50% can occur in favorable environments • Favored by moderate temperatures and high humidity • Low N fertility can increase disease • Can be introduced on transplants • Can carry over in the field

  9. Target Spot - Management • Rotation and sanitation • Control target spot in the float bed • Use good rotation • Deep-turn to bury debris • Site selection • Pick areas with good air movement & little shade • Resistant varieties not a serious option • ‘KY 14 x L8’ moderately resistant / ‘KT 204’ v. susceptible • Fungicides • Dithane DF – minimally effective • Quadris 2.08SC – labeled target spot along with frogeye & blue mold • Rate range = 6-12 fl oz/A [31 fl oz/A per season]

  10. Managing Target Spot with QuadrisOwsley Co., KY - 2006 b b b b a a P≤0.05 WAT = weeks after transplanting Variety – TN 90

  11. untreated Quadris – 8 fl oz/A (3 apps)

  12. Managing Target Spot with QuadrisOwsley Co., KY - 2006 a b b b bc cd P≤0.05 Variety – TN 90

  13. Managing Target Spot with QuadrisBreathitt Co., 2007 (High Disease Pressure) a a a b b bc c d P≤0.05 Variety – KT 204

  14. Managing Target Spot with QuadrisBreathitt Co., 2007 (High Disease Pressure) a ab ab bc bc bc cd d P≤0.05 Variety – KT 204

  15. Untreated Control Quadris-Dithane-Quadris

  16. Quadris and Foliar Diseases • Quadris is not a true systemic fungicide • Local systemic; not redistributed in plant extensively • Good coverage is critical to success • Timing • Use only if disease is anticipated • More apps. needed where (and when) pressure is greatest • Needs to be in place before row middles close (coverage) • Late application might be needed to protect after topping • Quadris can be an important part of a spray program • Multiple diseases: target spot, frogeye, blue mold • Can be used up to the day of harvest • May cause injury / don’t mix with EC pesticides • Don’t apply Quadris & MH together • Resistance management – don’t make back to back apps.

  17. Quadris Injury • Resembles weather flecking • Found on exposed portions of leaves • Relationship between high temperatures / direct sunlight & injury? • Rarely causes economic loss

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