PCNB – It’s Not Just for Snow Mold Anymore

PCNB (pentachloronitrobenzene) has been used as a turfgrass fungicide for more than 55 years. Golf course superintendents in the Northern, Western and Pacific Northwest regions of the U.S. have traditionally used it as the foundation of their fungicide programs to prevent pink and gray snow molds and Microdochium Patch – and there’s a good reason for that. In recent years, dozens of university fungicide trials from across the country have verified that PCNB-containing fungicide treatments have consistently been the top performers when snow mold and Microdochium Patch pressure is high and excellent fungicide efficacy is needed the most.

Although commonly known as the go-to fungicide for pink and gray snow mold and Microdochium patch, fewer superintendents know that PCNB also helps control several other significant turfgrass diseases, including brown patch, dollar spot and leaf spot.

Additionally, PCNB has a unique combination of several biological and chemical properties that makes it very useful as a turfgrass fungicide:

  • It is a contact fungicide.
  • It has multi-site modes of action.
  • It is the only FRAC Group 14 fungicide available for use on turfgrass.
  • There has been no evidence of turfgrass-infecting fungi developing resistance to PCNB in more than 55 years of use.

As a result, PCNB is a very valuable new tool that golf course superintendents can add to their fungicide programs as a rotation partner to help reduce and delay the development of fungicide resistance.

However, PCNB’s potential advantages don’t stop there. Charles Silcox, Ph.D., product development manager for AMVAC Environmental Products, worked with various researchers who conducted multiple trials over the past seven years. According to a video presentation by Dr. Silcox, these research trials have uncovered many interesting facts about PCNB, including the following: 

  •  In 2013, researchers at Penn State discovered that PCNB has activity on anthracnose. This exciting discovery led to more extensive fungicide trials on PCNB for anthracnose control between 2014 and 2018 at leading turfgrass research universities, including Penn State, Rutgers and UConn, and a contract research organization in southeastern Pennsylvania.
  • In 2014, fungicide research trials showed that, of the single active ingredient fungicide products, PCNB was the best single active ingredient for anthracnose control on annual bluegrass. PCNB performed better than newer DMI and SDHI fungicide chemistries and much better than azoxystrobin, especially in the Northeastern U.S., a region where many strains of anthracnose have developed resistance to the strobilurin class of chemistry.
  • During 2015 – 2018, research showed that a PCNB + tebuconazole combination treatment provided outstanding anthracnose control.  This PCNB + tebuconazole treatment performed better than PCNB alone and was consistently among the best fungicide treatments in the research trials.  

In 2016, AMVAC introduced this PCNB + tebuconazole treatment to the golf market as the turfgrass fungicide product Oreon™.  In 2018, Oreon™ was renamed Premion™.  

To learn more about these exciting anthracnose fungicide trial results, and how to best utilize the Power of PCNB and Premion™ in your fungicide programs, visit AMVACAnswers.com or contact your AMVAC field representative

Important: Always read and follow label instructions. PREMION is EPA registered. Some products may not be registered for sale or use in all states or counties. Please check with your state agency responsible for pesticide registration to ensure registration status. 

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