2016 Cercospora Res. Maps

2016 Cercospora Resistance Maps

Eminent (Minerva for 2017 crop) by township
Eminent/Minerva resistance levels are high throughout the RRV, resistance levels have increased slightly over the 2015 maps in comparison, with moderate to high resistance overall, and some Hillsboro District townships and a handful of others with very high resistance to take note of.  Eminent/Minerva is strongly recommended to only be used as a tank mix partner with another non-Triazole fungicide. Not more than 50% of total applications per year should include triazoles.  Contact your Agriculturist for information on a section by section basis.

Headline/Priaxor by township
About 75% of townships in the Red River Valley with sugarbeets, now exhibit severe resistance to Headline/Priaxor.  Greatest concerns are found in the Moorhead and Hillsboro factory districts.  Overall, 2016 shows a sharp increase in resistance from compared to 2015 when comparing maps.  It is strongly recommended Headline/Priaxor applications be preceded by fungicides with other modes of action to reduce concern from fields where resistance has been documented.  The best timing for application remains to be the last week of August through the first week of September for sugarbeet root frost protection and plant health benefits.  If used for application, Headline/Priaxor MUST be tank mixed with a full rate of each product in the tank mix, NEVER use these products without a tank mix partner.  Contact your Agriculturist for information on a section by section basis.

Inspire by township
Inspire resistance levels are moderate to high throughout the RRV, resistance levels are surprisingly largely unchanged from the 2015 maps in comparison, with moderate to high resistance overall, and with only 2 townships with very high resistance to take note of.  Inspire is strongly recommended to only be used as a tank mix partner with another non-Triazole fungicide. Not more than 50% of total applications per year should include triazoles.  Contact your Agriculturist for information on a section by section basis.                                                                                 

Proline by township
Proline resistance levels are overall moderate to high throughout the RRV, with a general band of very high resistance located in the Hillsboro District and some scattered townships to take note of. Proline is strongly recommended to only be used as a tank mix partner with another non-Triazole fungicide. Not more than 50% of total applications per year should include triazoles. Contact your Agriculturist for information on a section by section basis.

TPTH (Tin) by township
About 70% of townships exhibited Tin Resistance in 2016.  Overall, resistance to Tin increased slightly comparing the 2016 map to the 2015 map, however rapidly in the Moorhead District and going south.  Tin should be utilized as a tank mix partner with other chemistries, at full rates of each tank mix partner.  Contact your Agriculturist for information on a section by section basis.

Topsin by township
The percent of isolates resistant to Topsin remain to be low to average overall, with a few scattered high to very high resistant isolates throughout the Red River Valley. Topsin is NEVER recommended to be applied alone.  Topsin with a suitable tank mix partner remains to be a good choice, just not as the first application of the year.  Remember Topsin PHI is 21 days, so plan harvest accordingly around your spray rotation.

General Comments

2016 saw a second year of well above average CLS development.  Pressure was high from early planting, long growing season, heat & humidity, along with increased fungicide resistance to many modes of action.  Larger crops have included high CLS in recent history. Tank Mixes are a necessity, and not considered optional at this point with high resistance present.  20 gallons per acre water, 100 psi, starting spray program earlier and 14 days maximum spray interval are all needed practices with current CLS conditions.  Glyphosate applications must be separated from fungicide applications as water volumes vary by targeted pest. 

Another useful website is www.sbreb.org for the latest in North Dakota State University and University of Minnesota research information.