DISEASE CONTROL TABLE 3-22. DISEASE CONTROL PRODUCTS FOR ONION (cont'd) N. Gauthier and E. Fealko, Plant Pathologists, University of Kentucky Disease/Material FRAC Code ONION (GREEN) (CONT'D) PURPLE BLOTCH (ALTERNARIA PORRI) azoxystrobin (Quadris) 11 azoxystrobin + difenoconazole (Quadris Top) azoxystrobin + chlorothalonil (Quadris Opti) azoxystrobin + propiconazole (Quilt Xcel) azoxystrobin + tebuconazole (Custodia) boscalid (Endura) 70WG chlorothalonil (various) chlorothalonil + cymoxanil (Ariston) chlorothalonil + tebuconazole (Muscle ADV) cyprodinil (Vangard WG) cyprodinil + fludioxonil (Switch) difenoconazole + benzovindiflupyr (Aprovia Top) difenoconazole + cyprodinil (Inspire Super) fenamidone (Reason) fixed copper (various) fluopyram + pyrimethanil (Luna Tranquility) fluopyram + tebuconazole (Luna Experience) fluxapyroxad + pyraclostrobin (Merivon) mefenoxam + chlorothalonil (Ridomil Gold/Bravo) penthiopyrad (Fontelis) potassium phosphite + tebuconazole (Viathon) propiconazole (Quilt ) pyraclostrobin (Cabrio) pyraclostrobin + boscalid (Pristine) pyrimethanil (Scala) M See labels M+27 2.0 to 2.4 pt/acre M+3 9 9+12 3+7 3+9 11 M 7+9 7+3 7+11 4+M 7 49+3 3 11 1.1 to 1.6 pt/acre 10 oz/acre 11 to 14 oz/acre 10.5 oz/acre 16 to 20 fl oz/acre 5.5 to 8.2 fl oz See labels 16 to 27 fl oz/acre 8.0 to 12.8 fl. oz/ acre 4 to 11 fl oz/acre 2.5 lb/acre 16 to 24 fl oz/acre 2 to 3 pt/acre 14 to 27.5 fl oz 8 to 12 oz/acre 11+7 10.5 to 18.5 oz/acre 9 9 or 18 fl oz/acre STEMPHYLIUM LEAF BLIGHT (STEMPHYLIUM VESICARIUM) azoxystrobin (Quadris) 11 azoxystrobin + difenoconazole (Quadris Top) 11+3 14 14 7 7 7 7 14 7 1 7 7 7 14 3 7 7 7 7 2 0.5 0.5 0.5 0.5 0.5 0.5 0.5 1 0.5 0.5 0.5 2 0.5 0.5 0.5 0.5 1 0.5 Begin sprays prior to disease development and continue on a 7- to 14-day schedule. Use as a preventative treatment. Alternate with a different mode of action. Make no more than 2 sequential applications and no more than 6 applications per season. Make a maximum of 6 applications per season. Use lower rate in a tank mix with broad-spectrum fungicide and higher rate when applied alone. Do not apply more than 54 fl oz per crop. 6 to 12 fl oz/acre 12 to 14 oz/acre 7 4 hr 0.5 Make no more than two sequential applications before alternating with fungicides that have a different mode of action. Apply no more 90 fl oz Quadris per crop per acre per season. See individual labels for application instructions and rates. Make no more than one application before alternating with a fungicide with a different mode of action. 11+3 Rate of Material Formulation Minimum Days Harv. Reentry Method, Schedule, and Remarks 6 to 12 fl oz/acre 12 to 14 oz/acre 11+M 1.6 to 3.2 pt/acre 11+3 11+3 7 14 to 21 fl oz 8.6 to 12.9 fl oz 6.8 oz/acre 7 14 7 7 4 hr 0.5 0.5 0.5 0.5 0.5 Make no more than two sequential applications before alternating with fungicides that have a different mode of action. Apply no more 90 fl oz Quadris per crop per acre per season. See individual labels for application instructions and rates Make no more than one application before alternating with a fungicide with a different mode of action. Make no more than one application before alternating with a fungicide with a different mode of action. Make only one application before rotating to a non-group 11 fungicide. Use higher rate and shorter interval when disease conditions are severe. Do not make more than 2 sequential applications or more than 6 applications per season. Spray at first appearance. Maximum of three sprays. Apply prior to favorable infection periods; continue on 7- to 9-day interval; alternate with a different mode of action. Apply in a protective schedule or when weather is favorable for disease. Do not make more than 2 sequential applications before alternating to a different mode of action. Do not plant rotational crops other than onions or strawberries for 12 months following the last application. Also, for Stemphylium leaf blight. Use preventatively with a penetrating spreader. Make no more than two applications before alternating with a fungicide with a different mode of action. Begin applications when conditions favor disease development and continue on 5- to 10-day interval. Do not apply more than 22 fl oz per growing season. Alternate with fungicide from different resistance management group. May also reduce bacterial rots. When disease pressure is high, use higher rates and shorter intervals. Observe seasonal application limits for both group 7 and group 3 fungicides. Apply at disease onset; continue on 7- to 14-day schedule. No more than 3 applications/season. 2022 Vegetable Crop Handbook for Southeastern United States 247