AGRICULTURE

   
   
Cercospora Leafspot
   
                       
         
   

Cercospora Infection Values (2008 Crop)

Wahpeton Location

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

Information is for Cercospora infection potential is taken from the NDAWN web site; Wahpeton location.  If you have not been to the NDAWN web site you should really take some time and look it over.  Click on the link below to get there. 

 

 

 

Cercospora leaf spot spraying is just around the corner with Triazoles back on the menu for the 2008 season. With resistance management in mind, the Ag Staff will be recommending a Triazole - Tin - Strobilurin application program for this year. Keep in mind that the RR varieites do not have as low of a CLS rating as many of the other varieites that you are used to dealing with. Keep in close contact with your Agriculturist for proper application timing and any additional questions that you may have.

Here is a good example of what you can expect for CLS management this season:

Spray Program
Application #1
Application #2
Application #3
Application #4
One Spray
Strobilurin
---
---
---
Two Spray
Triazole
Strobilurin
---
---
Three Spray
Triazole
Tin
Strobilurin
---
Four Spray
Triazole
Tin
Strobilurin
Tin

Triazoles: Eminent - Enable - Proline - Inspire

Tins: AgriTin - SuperTin

Strobilurins: Headline - Gem - Quadris

 

Fungicides
Re-Entry Interval (Hours)
Pre Harvest Interval (Days)
Ground Application Water Volume (Gallons)
Rainfast (Hours)
AgriTin 4L
48
7
At least 15
***
AgriTin 80 WP
48
21 in MN & 7 in ND
At least 15
***
Quadris / Amistar
4
0
Sufficient water to ensure thorough coverage
***
Eminent
12
14
5 or more
***
Enable 2F
12
14
20
1
Gem
12
21
Min 10
***
Headline
12
7
Sufficient water to ensure thorough coverage
***
Inspire
12
7
15
1 Hr or after it dries
Proline
48
7
Min 10
2
SuperTin 4L
48
7 in MN & 21 in ND
At Least 15
***
SuperTin 80 WP
48
7
At Least 15
***

*** = Nothing is specified on the label.

 

General CLS Information:

  • Inoculum spores have a 1 - 2 year survival in infected leaf debris in sugarbeet fields when left on the surface. When tillage buries the debris, most inoculum spores are destroyed in 10 months.
  • Optimal sporulation, germination, and infection occur at 75 to 90 degrees with night temperatures above 61 degrees and high relative humidity.
  • Other hosts for Cercospora are Red Beet, Swiss Chard, Spinach and several weed species - particularly Redroot Pigweed and Common Lambsquarter.
  • Under natural infection conditions, a 3.5 KWS rating is reported to cause economic damage by reducing root yield and percent sugar (KWS scale of 1-9, with lower numbers indicationg less infection).

 

   
       
       
       
       
       
       
                     
                     
                     
           
                     
   
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