Greenhouse disease management recommendations for 2016 floriculture crops

Tom Dudek, Michigan State University Extension, and Mary Hausbeck, MSU Department of Plant, Soil and Microbial Sciences -

Recommendations for eight common greenhouse pathogens are now available.

Greenhouse floriculture growers in Michigan will benefit from the recently updated list of fungicide recommendations developed by Mary Hausbeck and her staff in the Department of Plant, Soil and Microbial Sciences at Michigan State University. This listing, “Greenhouse Disease Management 2016 Season,” provides options for growers when dealing with common floriculture pathogens, including Botrytis, powdery mildew, downy mildew, Phytophthora, Pythium, Rhizoctonia, Thielaviopsis and bacterial diseases.

For each pathogen, an “A” and “B” team list has been compiled. The A team products are those suggested for crops that are more susceptible to that specific disease and should be used on a regular preventative basis. We also recommend using the A team products if disease has been detected on the crop in question.

B team products are suggested for rotating into your spray program when disease pressure is low or the crop is not highly susceptible to that disease. Always follow label directions when applying any pesticide.

Michigan State University Extension states that accurate disease identification is critical for any successful disease management program. To determine which pathogen you are dealing with, we recommend having the infected plant tissue tested by a diagnostic laboratory such as MSU Diagnostic Services. For more details on how and where to send plant samples, go to the MSU Diagnostic Services website.

View the recommendations below, or download a printable PDF: Greenhouse Disease Management 2016 Season

Greenhouse Disease Management 2016 Season

This information is for educational purposes only. Reference to commercial products or trade names does not imply endorsement by MSU Extension or bias against those not mentioned.

Botrytis

  • “A” Team. Daconil (chlorothalonil), Decree (fenhexamid), Iprodione SPC/Chipco 26019/26 GT (iprodione), Pageant Intrinsic (pyraclostrobin + boscalid), Affirm WDG (polyoxin D zinc salt)
  • “B” Team. (Not recommended when disease pressure is high). Compass (trifloxystrobin), Heritage (azoxystrobin), Insignia (pyraclostrobin), Palladium (cyprodinil + fludioxonil)

Powdery mildew

  • “A” Team. Eagle 20EW (myclobutanil), Terraguard SC (triflumizole), Tourney (metconazole)
  • “A-/B+” Team. Heritage (azoxystrobin), Compass (trifloxystrobin), Insignia (pyraclostrobin), Strike (triadimefon), Strike Plus (trifloxystrobin + triadimefon), Pageant Intrinsic (pyraclostrobin + boscalid), Palladium WDG (fludioxonil + cyprodinil)

Downy mildew

  • “A+” Team. Subdue MAXX (mefenoxam), Adorn (fluopicolide), Segovis (oxathiapiprolin)
  • “A” Team. Stature DM (dimethomorph), Micora (mandipropamid), Orvego (ametoctradin + dimethomorph), Segway SC (cyazofamid), FenStop (fenamidone).
  • “B” Team. Alude/OxiPhos/Vital (phosphorous acid products), Heritage 50WG (azoxystrobin), Insignia (pyraclostrobin), Protect DF (mancozeb), Compass (trifloxystrobin)

Phytophthora

  • “A” Team. Subdue MAXX (mefenoxam), Adorn (fluopicolide), Micora (mandipropamid), Segovis (oxathiapiprolin)
  • “B” Team. FenStop (fenamidone), Alude/OxiPhos/Vital (phosphorous acid products), Captan (captan), Aliette WDG (fosetyl-al), Segway SC (cyazofamid), Truban WP/Terrazole L (etridiazole), Orvego (ametoctradin + dimethomorph), Stature DM (dimethomorph)

Pythium

  • “A” Team. Truban WP/Terrazole L (etridiazole), Subdue MAXX (mefenoxam) [Watch for pathogen resistance]
  • “B/B-“ Team. Captan (captan), FenStop SC (fenamidone), Heritage 50WDG (azoxystrobin), Empress Intrinsic Brand Fungicide (pyraclostrobin), Segway SC (cyazofamid), Alude/OxiPhos/Vital (phosphorous acid products)

Rhizoctonia

  • “A” Team. Medallion (fludioxonil), Terraclor 400 (pentachloronitrobenzene), Affirm WDG (polyoxin D zinc salt), Pageant Intrinsic (pyraclostrobin + boscalid), Tourney (metconazole), Empress Intrinsic Brand Fungicide (pyraclostrobin)
  • “B+” Team. 3336/OHP 6672 (thiophanate-methyl), Captan (captan), Heritage 50WG (azoxystrobin)

Thielaviopsis

  • Recommendations [Use high labeled rates]: 3336/OHP 6672 (thiophanate-methyl), Terraguard SC /LS (triflumizole), Medallion (fludioxonil)

Bacterial diseases

  • Camelot (copper salts of fatty and rosin acids), Champ, CuPRO (copper hydroxide), Phyton 27 (copper sulphate pentahydrate), Nordox 75WG (cuprous oxide), C-O-C-S (copper oxychloride + copper sulfate), Copper-Count-N [copper, bis(acetato-O)diammine]

This article was published by Michigan State University Extension. For more information, visit https://extension.msu.edu. To have a digest of information delivered straight to your email inbox, visit https://extension.msu.edu/newsletters. To contact an expert in your area, visit https://extension.msu.edu/experts, or call 888-MSUE4MI (888-678-3464).

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