Potato Late Blight Fungicides (2021)

Download 2021 Potato Late Blight Fungicides


This document contains a list of fungicides registered for control of potato late blight in Wisconsin. In-furrow and seed treatment registrations are omitted. Not a comprehensive list. Most fungicides listed are for use in conventional systems. Where generic fungicide trade names are listed, there may be numerous. Compiled 17 July 2021. Download as spreadsheet.

List of Registered Fungicides:

Trade Name Rate/acre Active Ingredient(s) PHI REI FRAC# Activity of Fungicide Comments
Agri Tin, Super Tin 4L, Super Tin 80WP 4-6 fl oz triphenyltin hydroxide 7 days 48 hours 30 Protectant; kills spores on contact Restricted use pesticide. 3 fl oz rate can be used if material is tank-mixed with another fungicide.
Alude 1.25 qt in 90 gal water mono and dipotassium salts of phosphorous acid 0 days 4 hours 33 Upregulates resistance/disease protection in plant Foliar application. Use higher rate when disease pressure is severe. Do not apply at less than 3 day intervals. Do not apply to plants that are dormant or that are heat or moisture stressed.
Confine Extra 3-5 qt in 20 gal water
K-Phite 7LP 1-3 qt in 10 gal water
Ariston 2 pt chlorothalonil + cymoxanil 14 day 12 hours M5+27 Protectant and locally systemic Additional chlorothalonil may be tank-mixed with this formulation to enhance % active ingredient applied (be sure to include the Ariston component in overall season total). Cymoxanil is Curzate.
Elixir 1.2 to 2.0 lb mancozeb + chlorothalonil 7 days 24 hours M3+ M5 Protectant Use higher rate as vines increase in size.
Fosphite, Rampart 1 to 4 qt potassium phosphite 0 days 4 hours 33 Upregulates resistance/disease protection in plant Foliar post-emergence spray and post harvest spray for control in storage. Apply in at least 20 gal water/acre.
Fungi-Phite Foliar: 2 qt/A
Seed trt: 15% vol to vol-2 ton in 1 gal solution
potassium phosphite 0 days 4 hours 33 Upregulates resistance/disease protection in plant Seed piece spray and foliar post-emergence spray. Tank-mix with another effective fungicide is recommended and use high label rate for late blight control.
Helena Prophyt 4 pt/acre
Badge SC 1 to 3 pt copper hydroxide, copper oxychloride 0 days 24 hours M1 Protectant Protectant activity only. Apply at 7 to 10 day interval.
Bravo Ultrex .7 then .9-1.36 lb chlorothalonil 7 days 12 hours M5 Protectant 11.25 lb a.i./acre maximum on standard label. However, WI has a special 24(c) registration for long season potatoes extending the max a.i. from 11.25 to 16 lb a.i./acre with Bravo (Syngenta) and Echo (Sipcam Advan) formulations.
Bravo WeatherStik, Echo 720, Equus 720 SST, Initiate 720, Chlorothalonil 720 SC, Chloronil 720, Praiz .75 then 1-1.5 pt
Bravo Zn, Equus 500 Zn, Initiate Zn 1 1/8 then 1.5 to 2.25 pt
Echo Zn 1 to 2.125 pt chlorothalonil 7 days 12 hours M5 Protectant 11.25 lb a.i./acre maximum on standard label. However, WI has a special 24(c) registration for long season potatoes extending the max a.i. from 11.25 to 16 lb a.i./acre with Bravo (Syngenta) and Echo (Sipcam Advan) formulations.
Equus DF .7 then .9 to 1.36 lb
Echo 90DF 5/8 then 7/8 to 1.25 lb
Cabrio Plus 2.9 lb pyraclostrobin+ metiram 3 days 24 hours 11+M3 Locally systemic and protectant 17.4 lb/acre maximum per season. Do not apply more than 2 sequential applications.
Champ WG 1 to 1.5 lb (3 to 4 lb if severe) copper hydroxide 0 days 24 hours M1 Protectant Use high label rates for foliar late blight protection.
Champ Formula 2 Flowable 2/3 to 2 2/3 pt
Champ DP Dry Prill 2/3 to 1 lb
Kentan DF 1 to 2.5 lb (4 lb if severe)
Kocide 2000 .73 to 3 lb
Kocide 3000 .5 to 1.75 lb
Nu-Cop 3L 2/3 to 2 pt (2 to 4 pt if severe)
Nu-Cop 50DF 1 to 1.5 lb (3 to 4 lb if severe)
Previsto 1 to 3 qt
C-O-C-S WDG 1.5 to 4 lb copper oxychloride, basic copper sulfate 0 days 24 hours M1 Protectant Use high label rates for foliar late blight protection.
Cuprofix-Ultra 40 Disperss .75 to 3 lb
Mastercop .5 to 1.5 lb copper sulfate pentahydrate 0 days 24 hours M1 Protectant Use high label rates for foliar late blight protection.
Cueva 2 gal in 50-100 gal water copper octanoate 0 days 24 hours M1 Protectant Use high label rates for foliar late blight protection.
Curzate 60DF 3.2 oz foliar cymoxanil 14 days 12 hours 27 Locally systemic Locally-systemic fungicide. Must be tank-mixed with a protectant fungicide. Rainfast within 2 hours. Cymbol.
Dithane F45 Rainshield .4 to 1.6 qt mancozeb 24 hours 3 days M3 Protectant Max rate per acre/season is 11.2 lb a.i. Begin use at lower rate and increase as vines increase in size.
Dithane M45 .5 to 2 lb
Koverall, Roper DF Rainshield, Fortuna 75WDG 1 to 2.0 lb
Evito 480SC, Aftershock 3.8 fl oz fluoxastrobin 7 days 12 hours 11 Locally systemic Follow label for resistance management.
Forum Foliar and tuber control: 6 oz dimethomorph 4 days 12 hours 40 Systemic May be tank-mixed with another effective fungicide for enhanced management – but not required by label.  Addition of an adjuvant may enhance management. Can be applied after vine kill.
Gavel 75DF 1.5 to 2 lb zoxamide + mancozeb 3 days 48 hours 22+M3 Protectant Do not make >6 applications/crop. Contact fungicide.
Gem 500SC 3.8 fl oz trifloxystrobin 7 days 12 hours 11 Locally systemic Follow label for resistance management.
Headline 6 to 12 fl oz pyraclostrobin 3 days 12 hours 11 Locally systemic Follow label for resistance management.
ManKocide 1.5 to 2 then 4-5 lb mancozeb + copper hydroxide 3 days 24 hours M3+ M1 Protectant Not labeled as a seed trt for potatoes.
Omega 500F 5.5 fl oz fluazinam 14 days 48 hours 29 Protectant REI is 4 days for high exposure activities. New special local need label 24c in April 2011.
Omega Top MP 5.5 fl oz – individual label for Omega sold in co-pack with Top MP difenoconazole fluazinam 14 days 48 hours 29 Protectant and locally systemic Can be applied aerially. REI is 4 days for high exposure activities.
Orondis Ultra 5.5 to 8.0 fl oz oxathiapiprolin + mandipropamid 14 days 4 hours U15 Translaminar or systemic within leaf and xylem mobile; rainfast within 30 minutes Max single application rate is 8.0 fl oz/A. Max annual rate is 32.0 fl oz/A/year. Do not apply >0.125 lb ai/year of oxathiapiprolin. Do not apply >0.522 lb ai/year of mandipropamid. Make no more than 2 sequential applications before rotating to a different mode of action. Do not follow soil applications of oxathiapiprolin with foliar applications of Orondis Ultra.
Orondis Opti 1.75 to 2.50 pt oxathiapiprolin + chlorothalonil 7 days 12 hours U15 + Translaminar or systemic within leaf and xylem mobile; rainfast within 30 minutes Max single application rate is 2.5 pt/A. Max application annual rate is 10 pt/A/year. Do not apply >0.125 lb ai/A/year of oxathiapiprolin. Do not apply >11.25 lb ai/A/year of chlorothalonil.
Oxidate 40 to 120 fl oz to 100 gal water, 30-100 gal/acre hydrogen dioxide 0 days 1 hour NC Kills spores on contact and no residual protectant activity after treatment Foliar spray for late blight. Frequent applications (5-day intervals) can limit sporulation.
Penncozeb 80WP, Penncozeb 75DF .5 to 2 lb mancozeb 3 days 24 hours M3 Protectant Do not exceed 11.2 lb a.i./acre/year.
Penncozeb 4FL, Manzate flowable .4 to 1.6 qt
Manzate Pro-Stick 1 to 2 lb, seed trt: 1.25 lb/50 gal water
Phostrol 2.5 to 10 pt
Post harvest trt: 1 gal/ton in .5 gal water
mono- and di-basic sodium, potassium, and ammonium phosphites 0 days 4 hours 33 Upregulates resistance or plant defense Can be applied as a foliar for late blight, pink rot, and Pythium leak. Can be applied post-harvest for storage disease control.
Polyram 80DF 1.5 to 2 lb in 15 gal water/acre minimum metiram 3 days 24 hours M3 Protectant Metiram is an EBDC, like mancozeb (M3). Total amount of a.i. per year/acre must include all EBDCs.
Previcur Flex .7 to 1.2 pt propamocarb hydrochloride 14 days 12 hours F Systemic antisporulant Apply in a tank-mix with effective protectant. Can be applied as a broadcast or banded application over the row, post-emergence.
Priaxor 4-8 fl oz fluxapyroxad + pyraclostrobin 7 days 12 hours 7+11 Protectant and locally systemic Cannot apply more than 3 applications/season. Follow label for resistance management. Xemium and Headline pre-mix.
Quadris, Satori, Willowood Azoxy 2SC, Aframe, Equation SC 6 to 15.5 fl oz azoxystrobin 14 days 4 hours 11 Locally systemic Alternate away from Group 11 fungicides to manage resistance.
Trevo, Azoxystrar, Azoxyzone 6 to 20 fl oz
Quadris Opti 1.6 pt azoxystrobin + chlorothalonil 14 days 12 hours 11+M5 Locally systemic and protectant Alternate away from Group 11 fungicides to manage resistance.
Ranman 1.4 to 2.75 fl oz cyazofamid 7 days 12 hours 21 Protectant Follow label for resistance management.
Reason 5.5 to 8.2 fl oz fenamidone 14 days 12 hours 11 Locally systemic Follow label for resistance management.
Revus Top 5.5 to 7 fl oz mandipropamid + difenoconazole 14 days 12 hours 40+3 Locally systemic and contact Addition of an adjuvant is recommended.
Tanos 8 to 10 oz cymoxanil + famoxadone 14 days 12 hours 27+11 Locally systemic and contact Must be tank-mixed with an effective protectant fungicide. Good protectant for limiting leaf blight. Excellent curative.
Ridomil Gold SL 1 to 2 pt mefenoxam 14 days 48 hours 4 Systemic Do not apply beyond the at-planting stage.
Ridomil Gold Bravo SC 2.5 pt mefenoxam + chlorothalonil 14 days 48 hours 4+M5 Systemic and protectant Follow label for resistance management.
Ridomil Gold Copper 2 lb mefenoxam + copper hydroxide 14 days 48 hours 4+M1 Systemic and protectant Tank-mix with an effective protectant.
Ridomil Gold MZ WG 2.5 lb mefenoxam + mancozeb 3 days 48 hours 4+M3 Systemic and protectant Follow label for resistance management.
Zampro 11 to 14 fl oz ametoctradin + dimethomorph 4 days 12 hours 45+40 Systemic and protectant Do not make more than 2 sequential applications. Follow label for resistance management. Ametoctradin is new a.i.; dimethomorph is Forum (formerly Acrobat).
Zing! 32 to 34 fl oz zoxamide + chlorothalonil 7 days 12 hours 22+M5 Protectant Do not make more than 2 sequential applications before alternating with another fungicide of a different mode of action. Do not make >8 applications or apply >1.52 lb of zoxamide and 8.88 lb of chlorothalonil per season per acre.