AGRICULTURE

   
   
Cercospora Leafspot
   
                       
         
   

2011 Edition

 

Daily Infection Values

(NDAWN - Wahpeton location)

 

Date
Infection Potential
Sept 18
Slight
Sept 17
Slight
Sept 16
Slight
Sept 15
Slight
Sept 14
Slight
Sept 13
Slight
Sept 12
Slight
Sept 11
Slight
Sept 10
Slight
Sept 09
Slight
Sept 08
Slight
Sept 07
Slight
Sept 06
Slight
Sept 05
Slight
Sept 04
Slight
Sept 03
Slight
Sept 02
Moderate
Sept 01
Severe
August 30
Severe
August 29
Severe
August 28
Moderate
August 27
Slight
August 26
Slight
August 25
Slight
August 24
Slight
August 23
Slight
August 22
Moderate
August 21
Moderate
August 20
Slight
August 19
Slight
August 18
Slight
August 17
Slight
August 16
Moderate
August 15
Severe
August 14
Moderate
August 13
Slight
August 12
Slight
August 11
Slight
August 10
Slight
August 09
Moderate
August 08
Severe
August 07
Severe
August 06
Severe
August 05
Moderate
August 04
Slight
August 03
Moderate
August 02
Severe
August 01
Severe
July 31
Moderate
July 30
Moderate9
July 29
Severe
July 28
Severe
July 27
Severe
July 26
Moderate
July 25
Moderate
July 24
Moderate
July 23
Moderate
July 22
Moderate
July 21
Severe
July 20
Severe
July 19
Severe
July 18
Severe
July 17
Severe
July 16
Severe
July 15
Moderate
July 14
Slight
July 13
Slight
July 12
Slight
July 11
Moderate
July 10
Moderate
July 09
Moderate
July 08
Slight
July 07
Slight
July 06
Slight
July 05
Slight
July 04
Slight
July 03
Moderate
July 02
Moderate
July 01
Slight

 

The 2011 crop's early canopy closure combined with the excess moisture the past few weeks will likely lead to an earlier start to this year's fungicide program (and possibly a few more applications than the last couple of years). This year's program will be similar to others that have been used in previous years, with a couple slight modifications:

 

Spray Program
Application #1
Application #2
Application #3
Application #4
Two Spray
Triazole
Strobilurin
---
---
Three Spray
Triazole
TPTH + Benzimidazole
Strobilurin
---
Four Spray
Triazole
TPTH + Benzimidazole
Strobilurin
TPTH

 

 

Triazoles: Eminent - Proline - Inspire XT - Enable

TPTH: AgriTin - SuperTin

Strobilurins: Headline - Gem

Benzimidazoles: Topsin M 4.5L, Topsin M 70 WDG, Topsin M 70WP, Topsin M WSB, Thiophanate Methyl 85 WDG, T-Methyl 70W WSB, T-Methyl E-AG 4.5 F and T-Methyl E-AG 70 WSB

Things to consider:

 

- The single most important fungicide application is the very first one. Research indicates that the best timing of
  fungicide for both control and net revenue occurs just prior to the first spot being found.
 
- Headline should be applied the last week of August - early applications of Headline shows no plant health benefit
  or increased frost tolerance.
 
- Applying Proline in July may be later than recommended for post-emerge Rhizoctonia Control, but some activity has 
  been noted in test plots. It should be considered as the Triazole fungicide of choice for fields that have a history of or 
  are showing active Rhizoctonia infections. Proline must be applied with a non-ionic surfactant.
 
- Always rotate fungicide classes. Ideally do not use any chemistry more than once in the program.
 
- Fungicides with a contact mode of action are most effective with thorough coverage and applied prior to the onset 
  of disease symptoms - Apply before, NOT AFTER infection has occurred.

 

Fungicide Name
Pre-Harvest Interval (Days)
Re-Entry Interval (Hours)
    Rainfast (Hours)
Maximum Amount per Year
Eminent
14
12
2
2 Applications
Proline
7
48
2
17.1 oz.
Inspire XT
21
12
1
21 oz
Enable
14
12
1
16 oz
Headline
7
12
Dry on Leaf
48 fl. oz.
Gem
21
12
2
10 fl. oz.
TPTH (Liquid)
7
48
Dry on Leaf
24 fl. oz.
TPTH (Dry)
7
48
Dry on Leaf
15 oz.
TPTH + Benzimidazole
21
48
Dry on Leaf
1 Application

 

 

 

 

 

 

 

   
       
       
       
       
   
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