Cercospora Resistance Maps For 2006

Comments for 2006 Internet Cercospora Resistance Maps

Eminent Resistance Map - view map

Congratulations on a great job in reducing Eminent resistance in 2006
This map demonstrates the impact a careful spray program selection can have on resistance development
ND had 55 fully resistant fields in 2005 and only 28 in 2006
MN had 72 fully resistant fields in 2005 and only 41 in 2006
Follow similar strategies in 2007 to show further reductions
Two Moorhead townships and two at Wahpeton are very high for Eminent resistance. Over 60 % of the high risk fields are in Minn-Dak and the Moorhead Factory District
Partial resistance is prevalent all over the Minn-Dak area and in MN for Moorhead and Hillsboro
Scattered townships in Crookston, EGF, and Drayton have some risk (pink)
All grey and green townships could use Tin/Eminent/Headline or Eminent/Tin/Headline programs
+ mark those fields with > 1 ppm Eminent resistance
None of the sections with a + or surrounding pink or red townships should have Eminent applied first, use a tin product first then Eminent then Headline in a three spray program
In a two spray program in these areas use a tin product then Headline, you might consider a tin + Eminent tank mix followed by Headline in such areas, but this is a costly application
Green or grey townships have low risk but watch for nearby +
One spray use only Headline, two spray program use tin/Headline and for a three spray program use Tin/Eminent/Headline

GEM Resistance Map - view map

Resistance or partial resistance went down by about 25 % in 2006, this would be consistent with the amount of Gem applied.
25 townships show partial resistance to Gem
Headline is a better strobilurin for both Cercospora leafspot control and plant health benefits. Don't use two strobilurin applications in one season

Headline Resistance Map - view map

Essentially the entire RRV, except for one township in Minn-Dak, has no resistance to Headline
34 fields had partial resistance to Headline in 2005 only 8 in 2006
Continuing excellent fungicide rotation programs manages resistance well
Never use Headline more than once per season
Slightly more concern in the Moorhead district and Minn-Dak

TPTH Resistance Map - view map