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Timing of AMS 21619 Fungicide on Munich Durum, Langdon 2002.

 

S. Halley,Langdon Research Extension Center-North Dakota State University, Box 310 Hwy 5 E Langdon, North Dakota 58249

*Corresponding author PH: (701) 256-2582, E-mail: shalley@ndsuext.nodak.edu

 

A trial was established at the Langdon Research Extension Center to evaluate application timings of the AMS 21619 fungicide (JAU 6476) for control of Fusarium head blight (FHB). �Munich� durum was planted with a double disk Melroe grain drill. Plots 6 x 20 ft. were established in a randomized complete block design with four replicates to compare treatment means. The first fungicide application was made at Zadoks 65 (flowering growth stage) on July 9. Additional treatments included July 15, July 22, July 9 + 15, and an untreated check. Applications were made by CO2 backpack sprayer with XR8001 nozzles mounted on a double swivel angled downward 30 degrees from horizontal and oriented forward and backward. AMS 21619 was applied at 5.7 oz/acre.  Recommended production practices for Northeast North Dakota were followed. Three weeks prior to heading a Fusarium spawn grown on spring wheat was hand broadcast at a rate of approximately 200 grams/plot. Data was analyzed with the general linear model (GLM) in SAS. Least significant differences (LSD) were used to compare means at the 5% probability level.

 

Application of AMS 21619 at flowering growth stage was effective in reducing FHB incidence over other treatments. Application on July 15 had lower incidence than untreated and July 22 but was significantly greater than flowering applications. FHB field severity (summation of visual spike FHB incidence x head severity) was not different among the July 9, 15, and 9 + 15 applications but the July 22 and untreated applications were greater than July 9 applications. Yield was also increased by fungicide applications on July 9 and 15 by as great as 20 bu/acre. The repeat application, 9 + 15, increased test weight compared to July 15 and later applications.

 

Proper timing of the fungicide AMS 21619 can enhance yield and test weight by reducing FHB disease. A delay to fungicide application of 13 days effectively negated benefits of AMS 21619. This data would concur with Jordahl et.al. 2002.

 

Jordahl, J. S. Meyer, and M. McMullen. 2002. Multivple infection events and split timing of Folicur fungicide applications for control of FHB in hard red spring wheat, durum wheat, and spring barley, 2002. 2002 National Fusarium Head Blight Forum Proceedings.

 

  

Application

FHB

Yield

Test

Timing

Incidence

Field Severity

 

Weight

 

%

%

bu/acre

lb/bu

 

 

 

 

 

July 9

10.0

0.9

60.4

59.8

July 15

35.0

2.5

60.8

59.0

July 22

51.3

5.5

46.1

57.3

July 9 + 15

6.3

0.3

65.7

60.1

Untreated

68.8

8.0

45.5

56.1

 

 

 

 

 

LSD p> 0.05

20.2

2.7

12

1.0

% C.V.

38

51

14

1

 

 

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