Brown Patch Fungicide Trial
Mark L. Gleason, Stephen N. Wegulo, Sara J. Helland, and John P. Newton
Trials were conducted at Veenker Golf Course on the campus of Iowa State University. Fungicides, selected for activity against brown patch, were applied to creeping bentgrass maintained at 0.16-inch cutting height, using a modified bicycle sprayer at 30 psi and a dilution rate of 5 gal per 1,000 sq ft. The experimental design was a randomized complete block with four replications. All plots measured 4 ft x 5 ft. Fungicide treatments were all applied on 21 Jun, then re-applied at recommended intervals on 2, 5, 12, and 20 Jul.
Brown patch symptoms were first observed on 27 Jun. Most products suppressed brown patch and dollar spot significantly in comparison to the unsprayed control on 6 Aug. No phytotoxicity symptoms were observed during the trial.
Fungicide products, application rates and intervals, and brown patch and dollar spot severity at the Veenker Golf Course, 2001
|
Brown |
Brown |
Brown |
Brown |
Dollar |
Dollar |
Dollar |
Dollar |
||
|
Interval |
Patch* |
Patch |
patch |
patch |
Spot** |
spot |
spot |
spot |
|
|
Product and rate per 1,000 sq ft |
(days) |
6/27/01 |
7/11/01 |
7/24/01 |
8/6/01 |
6/27/01 |
7/11/01 |
7/24/01 |
8/6/01 |
|
Unsprayed check....………………… |
-- |
1.3 |
3.5 |
3.8 |
3.8 |
3.3 |
10.3 |
9.3 |
16.5 |
|
Eagle G (XF-00023) 4.0z.............….. |
14 |
1.0 |
2.3 |
3.8 |
0.8 |
12.5 |
20.1 |
14.0 |
1.0 |
|
Eagle G (XF-00023) 8.0z..............…. |
28 |
2.3 |
1.5 |
2.5 |
2.5 |
4.0 |
6.0 |
7.4 |
5.5 |
|
Eagle G (XF-00024) 2.5z..............…. |
14 |
0.3 |
1.0 |
2.3 |
1.3 |
8.0 |
15.1 |
14.0 |
9.8 |
|
Eagle G (XF-00024) 5.0z..............…. |
28 |
0.5 |
1.8 |
2.5 |
0.5 |
7.4 |
14.0 |
9.9 |
5.0 |
|
Eagle/Daconil (XF-00044) 3.5 oz.…. |
14 |
0.5 |
3.3 |
3.3 |
3.5 |
11.5 |
20.5 |
21.5 |
20.0 |
|
Eagle/Daconil (XF-00044) 7.0 oz.…. |
28 |
0.5 |
2.0 |
1.5 |
0.5 |
10.3 |
16.3 |
5.1 |
10.1 |
|
Golden Eagle 4.0 oz………………... |
14 |
1.5 |
1.3 |
2.3 |
1.5 |
10.0 |
10.5 |
11.9 |
4.8 |
|
Golden Eagle 4.0 oz...................…… |
28 |
1.3 |
1.5 |
2.5 |
2.3 |
2.5 |
7.5 |
8.1 |
9.6 |
|
Banner MAXX 2.0 oz |
14 |
1.0 |
0.0 |
0.0 |
0.0 |
3.4 |
0.4 |
1.7 |
0.0 |
|
Bayleton 0.5G 1.5 oz....................…. |
14 |
1.0 |
0.0 |
0.0 |
0.5 |
8.9 |
1.2 |
0.0 |
0.0 |
|
Daconil 82.5 WDG 3.2 oz.…………. |
14 |
1.0 |
0.0 |
0.5 |
1.0 |
4.5 |
2.3 |
0.8 |
1.8 |
|
Confidential 2.0 fl oz...............……... |
7 |
2.3 |
0.3 |
0.3 |
0.3 |
15.0 |
7.5 |
1.3 |
4.5 |
|
Confidential 4.0 fl oz.....................…. |
7 |
2.0 |
2.0 |
4.5 |
2.0 |
4.8 |
8.5 |
9.0 |
9.0 |
|
Confidential 2.0 fl oz.....................…. |
7 |
1.3 |
2.3 |
2.3 |
1.5 |
4.8 |
11.3 |
11.5 |
0.0 |
|
Confidential 4.0 fl oz.....................…. |
7 |
0.5 |
2.3 |
2.3 |
0.5 |
0.8 |
3.1 |
1.5 |
4.0 |
|
Confidential 2.0 fl oz...................…... |
7 |
1.5 |
1.8 |
1.3 |
0.3 |
19.3 |
25.8 |
17.0 |
1.8 |
|
Confidential 4.0 fl oz.................……. |
7 |
1.8 |
1.3 |
2.5 |
0.8 |
9.5 |
10.5 |
11.0 |
23.8 |
|
Confidential 2.0 fl oz……………….. |
7 |
1.3 |
2.0 |
1.5 |
0.5 |
3.5 |
11.0 |
10.8 |
11.3 |
|
Confidential 4.0 fl oz........................... |
7 |
1.3 |
3.3 |
2.0 |
0.3 |
8.8 |
13.0 |
12.0 |
13.8 |
|
Confidential 2.0 fl oz……………….. |
7 |
1.3 |
2.3 |
2.5 |
1.5 |
8.8 |
17.5 |
10.5 |
13.8 |
|
Confidential 4.0 fl oz.…….............…. |
7 |
2.8 |
1.3 |
2.5 |
2.0 |
10.8 |
17.5 |
16.5 |
4.5 |
|
Daconil Ultrex 82.5 WDG 3.2 oz…… |
14 |
1.0 |
0.3 |
0.0 |
1.0 |
10.0 |
2.3 |
0.3 |
2.3 |
|
+Primo MAXX 1 MEC 0.15 fl oz |
|||||||||
|
Daconil Ultrex 82.5 WDG 3.2 oz…… |
14 |
0.8 |
0.0 |
0.0 |
0.0 |
1.6 |
0.1 |
0.4 |
0.0 |
|
+Banner MAXX 1.3 MEC 0.5 fl oz |
|||||||||
|
+Primo MAXX 1 MEC 0.15 fl oz |
|||||||||
|
Heritage 50WG 0.2 oz………………. |
14 |
0.5 |
0.0 |
0.0 |
0.0 |
3.8 |
0.6 |
0.1 |
0.3 |
|
+Banner MAXX 1.3 MEC 0.5 fl oz |
|||||||||
|
+Primo MAXX 1 MEC 0.15 fl oz |
|||||||||
|
Banner MAXX 1.3 MEC 1.0 fl oz…… |
14 |
1.3 |
0.0 |
0.3 |
0.0 |
6.1 |
1.3 |
0.3 |
0.0 |
|
+Primo MAXX 1 MEC 0.2 fl oz |
|||||||||
|
Heritage 50WG 0.2 oz……………… |
14 |
0.0 |
0.0 |
0.0 |
0.0 |
4.3 |
0.8 |
0.2 |
0.5 |
|
+Banner MAXX 1.3 MEC 0.5 fl oz |
|||||||||
|
MSD (K=100) *** |
2.8 |
4.0 |
2.4 |
2.1 |
17.9 |
14.5 |
20.6 |
12.2 |
*Mean disease severity rating; 0= no disease, 1= 1-5%, 2= 6-10%, 3= 11-25%, 4= 26-50%, 5= >50% of plot symptomatic n= 4
**% of plot symptomatic. n= 4.
***Minimum significant difference from the Waller-Duncan k-ratio test (K = 100).
 |
ISU Horticulture:Publications:2002 Turfgrass Report | College of Agriculture |
106 Horticulture Hall
Ames, Iowa 50011
Phone: (515) 294-2751
Fax: (515) 294-0730
Website or Department-related Questions/Comments: hortdept@iastate.edu
Plant Questions: hortline@iastate.edu
Contents ©1995-2003, ISU Horticulture Department