Cercospora Fungicide Efficacy Trial

All treatments reduced the disease equally, including the use of Bac J used preventatively.  This use was based on recent research showing that the mode of action for this bacteria is induction of systemic resistance genes in the sugarbeet plant so that it defends itself against the Cercospora leaf spot pathogen.  Several treatments significantly increased percent sugar even though there was no significant increase in sucrose yield per acre.  This would have been anticipated based on the AUDPC information showing very low disease intensity.

 

 Treatment

AUDPC

% sucrose

Sucrose-Lb/Acre

untreated

1.67

17.1

10999

Bac J preventive

0.15

17.6

10943

Eminent 13 oz alt. SuperTin 5 oz.

0.47

17.7

10875

Eminent 13 oz alt BAS 500 0.15 lb ai.

0.13

17.7

11295

Eminent 13 oz alt Flint 3 oz.     

0.10

18.4

11076

Stratego 10 oz alt SuperTin 5 oz

0.18

17.5

11237

Stratego 14 oz alt SuperTin 5 oz

0.15

18.1

11266

Eminent 13 oz/Benlate 0.5 lb SuperTin 5 oz/Penncozeb 2 lb

0.19

18.0

10895

Benlate 0.5 lb/Eminent 13 oz, Benlate 0.5 lb + Penncozeb 1.5 lb/ Eminent 13 oz

0.12

18.3

10957

Eminent 13 oz/Topsin M 0.5 lb./ Dithane DF 2.0 lb/Eminent 13 oz.

0.43

17.9

11298

Eminent 13 oz + Bac J 

0.16

16.7

10419

BAS 500 0.15 lb ai. +1%Agridex

0.14

17.9

11145

BAS 500 0.15 lb. ai.+ Bac J

0.22

17.7

11079

Flint 3 oz + Bac J        

0.13

18.0

11216

Flint 3 oz alt Benlate 0.5 lb.

0.12

17.9

11792

Stratego 10 oz alt Benlate 0.5 lb.

0.12

18.3

11782

Benlate 0.5 lb. alt Flint 3 oz

0.18

18.2

11461

metaconazole 0.1 lb. ai

0.13

17.7

11671

metaconazole 0.075 lb. ai.

0.14

17.7

11499

Benlate 0.5 lb +Bac J/ Eminent 13 oz + Bac J/ Bac J/ Bac J

0.40

18.1

10931

LSD 0.05

0.58

1.1

ns

Spray dates:  BAC J preventive:   6/26/00 + 7/12, 7/26, 8/09, 8/23, All others: 7/12, 7/26, 8/09, 8/23
Variety: Beta 2185
Soil type:  Savage Silt Loam, Plot Design: Randomized Complete Block-6 replications
AUDPC rating dates: 7/12, 8/15, 8/23, 9/11
Planted: April 21      
Harvested: September 20

 Acknowledgements:  Sugarbeet research at Sidney, Montana has received grant support from the Montana-Dakota Sugarbeet Growers Association/Imperial Holly Sugar, the North Dakota State Board of Agricultural Research and Education (SBARE) and the Sugarbeet Research and Education Board of Minnesota and North Dakota.

 

 
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Last modified: August 04, 2003