Revision Date 8 4 2004 Bob Mulrooney Extension Plant Pathologist PP 07 Fungicide Recommendations for Turfgrass The following list of fungicide recommendations is intended primarily for commercial applicators for preventative sprays to home or commercial turf Homeowner use of fungicides for lawn disease control is generally discouraged Most products are safe for homeowners to use with precautions listed on their labels but many will not be available for sale to homeowners Management of diseases without the use of fungicides is highly recommended for home lawns There are situations when fungicides are needed but for most cases fungicides should be applied by lawn care professionals not by the homeowner If a disease is present at a level that the homeowner notices it is usually too late for a fungicide to be effective Fungicides need to be applied preventatively before disease occurs in most cases to be effective In addition homeowners typically do not have the proper equipment to make an effective application to prevent diseases If a disease occurs regularly preventative spraying is recommended if the disease can kill the turf Some diseases like brown patch just disfigure the lawn for a time When the weather pattern changes that favored disease development the disease stops and the turf recovers without a fungicide See fact sheet PP6Lawn Diseases Identification and Management for more information on other disease control strategies and identification of common diseases These disease control recommendations contain fungicides that have proven to be effective under Delaware conditions when used according to instructions on the manufacturer s label Trade names appear for simplicity No endorsement of such products nor criticism of similar products not listed is implied or intended Numbers within parentheses represent maximum recommended spray intervals Algae and moss Apply when they first appear Repeat at 7 14 day intervals mancozeb 7 Daconil 14 Pentathlon 7 or Thalonil 14 Anthracnose Apply when the disease first appears Repeat at 10 to day intervals Banner 28 Bayleton 28 Cleary 3336 14 Daconil 14 Compass 21 Eagle 21 Heritage 28 Manicure 14 Medallion Thalonil 14 Rubigan 28 or Sentinel 28 Spectro 14 Brown patch Apply between June 1 and September 15 at 7 to intervals Banner 14 Chipco 26019 28 Cleary 3336 14 Compass 28 Curalan 14 Daconil 14 Eagle 21 Fungo 14 Heritage 28 mancozeb 14 Manicure 14 Medallion Prostar 21 Sentinel 28 Spectro 14 Thalonil 14 thiram 10 or Touche 14 http ag udel edu extension It is the policy of the Delaware Cooperative Extension System that no person shall be subjected to discrimination on the grounds of race color sex disability age or national origin Dollar spot apply between May 15 and October 15 at 7 to day intervals Banner 28 Bayleton 28 Chipco 26019 28 Curalan 28 Daconil 21 Eagle 28 Emerald mancozeb 14 Manicure 21 Rubigan 28 Sentinel 28 Spectro 14 Thalonil 21 Touche 28 or Vorlan 28 Fairy rings We have not been successful in controlling fairy ring with chemicals For best results aerify affected areas maintain adequate soil moisture and apply nitrogen to mask symptom expression Prostar and Heritage have proven to be effective fungicides against some species of fungi that cause fairy rings Use according to the manufacturer s recommendations Gray leaf spot Apply between July 15 and Oct 15 at 7 to day intervals Banner 14 Chlorostar 21 Cleary 3336 14 Compass 21 Daconil 10 Heritage 21 Manicure 10 Sentinel 28 or Spectro 14 Leaf spot and melting out Apply when the grass starts to turn green in the spring Repeat twice at 7 to day intervals Chipco 26019 28 Compass 21 Curalan 28 Daconil 21 Heritage 21 mancozeb 21 Manicure 21 Medallion Thalonil 21 Touche 28 or Vorlan 28 Necrotic ring spot Apply Sept to Nov and April to June every 28 days as needed utilizing one of the following Banner Cleary 3336 Eagle Fungo Heritage Rubigan or Sentinel Chemicals should be watered into the root zone for maximum effectiveness Reapply thiophanate methyl Clearys 3336 every 14 days Powdery mildew Apply between August 15 and October 15 at 10 to day intervals Banner 28 Bayleton 28 Eagle 28 Rubigan 28 or Sentinel 28 Pythium blight Apply between June 15 and September 15 at 5 to day intervals Aliette 14 Banol 21 Heritage 10 Koban 10 mancozeb 5 Prodigy 14 Subdue MAXX 21 Terraneb SP 7 or Terrazole 10 Apron may be used as a seed treatment to prevent damping off Mancozeb can be used to control this disease but is generally less effective than the products mentioned above Pythium root and crown rot When the disease first appears apply a contact fungicide such as Koban mancozeb or Terrazole in 5 to 10 gal of water Irrigate the treated area immediately with 1 8 to 1 4 inches of water to ensure penetration into the soil For best results retreat the affected area within 5 to 7 days with an acropetal penetrant such as Aliette Banol Heritage Prodigy Quell or Subdue Maxx Chemicals should be watered into the root zone for maximum effectiveness Red thread Apply when the daytime temperature in the spring stabilizes between 60 and 75o F Repeat at 7 to day intervals Banner 21 Bayleton 28 Chipco 26019 14 Compass 21 Curalan 28 Eagle 14 Heritage 28 Rubigan 28 Sentinel 28 Touche 28 or Vorlan 21 Rust Apply between August 15 and October 15 at 7 to day intervals Banner 28 Bayleton 28 Daconil 14 Eagle 14 mancozeb 14 Manicure 14 Sentinel 28 or Thalonil 14 Slime molds Mow off or rake out when they appear General purpose fungicides such as mancozeb may help reduce their appearance but generally are not required Snow molds Gray Apply between November 15 and February 15 Repeat at 8 week intervals if necessary with Banner Bayleton Chipco 26019 Curalan Daconil Heritage Manicure PCNB Prostar Rubigan Sentinel Teremec Terraneb SP Thalonil or Touche Snow molds Pink Apply between November 15 and May 15 Repeat at 8 week intervals if necessary with Banner Chipco 26019 Cleary 3336 Curalan Fungo Heritage PCNB Spectro Touche or Vorlan Stripe smut Either make one application of Banner Bayleton Cleary 3336 Eagle Fungo Rubigan or Sentinel in mid October or apply in mid May and then repeat 8 and 16 days later Summer patch Fusarium blight syndrome Apply in late May late June and late July in 4 to 5 gal water 1000 sq ft for optimum control utilizing one of the following Banner Bayleton Cleary 3336 Eagle Fungo Heritage Rubigan or Sentinel Maintain soil pH at approx 6 0 Chemicals must be watered into the root zone for maximum effectiveness These