Trials were conducted at Veenker Golf Course on the campus of Iowa State University. Fungicides were applied to creeping bentgrass maintained at 5/32-inch cutting height, using a modified bicycle sprayer at 30 psi and a dilution rate of 5 gal/1,000 ft². The experimental design was a randomized complete block with four replications. All plots measured 4 ft x 5 ft. Fungicide applications began on June 16. Subsequent applications were made on June 23 and 30, and July 6, 14, 21, and 28.

Rainfall and air temperatures were slightly below normal through June and July. Brown patch symptoms were first observed on July 1. Brown patch development on untreated check plots — expressed on a 0-5 scale (0=no disease, 1=1-5%, 2=5-10%, 3=10-25%, 4=25-50%, 5=>50%) was light on July 1 and July 8, and to severe on July 24. Most, but not all, fungicide treatments exhibited significantly (LSD, P=0.05) less disease than the untreated check on all dates. Dollar spot development on the brown patch plot, also depicted in the Table, was light on July 1 and 8 and moderate on July 24. NOTE: The dollar spot data is provided for your information. The fungicides selected for the trial were aimed primarily against brown patch.

No phytotoxicity symptoms were observed during the trials.

(days) 7/1/00 7/8/00 7/24/00 7/1/00 7/8/00 7/24/00

1 Check ---------- ----------- -------- 1.25 0.75 4.75 0.85 3.00 8.50

2 Tomen Agro TM-41702 40WP 0.10 oz 14 1.50 0.50 5.00 2.60 1.28 1.65

3 Tomen Agro TM-41702 40WP 0.25 oz 14 1.00 0.25 2.50 0.30 0.00 0.10

4 Tomen Agro TM-41702 40WP 0.50 oz 14 0.50 0.00 3.75 0.10 0.00 0.03

5 Tomen Agro TM-41702 40WP 0.70 oz 14 0.50 0.00 4.00 0.05 0.00 0.00

6 Tomen Agro Daconil Ultrex 82.5WG 1.8 oz 14 0.75 0.50 4.00 0.50 0.40 3.75

7 Tomen Agro Daconil Ultrex 82.5 WDG 1.8 oz 14 0.00 0.00 0.00 0.30 0.05 3.53

+ Heritage 50WG 0.2 oz

8 Tomen Agro TM-41702 40WP 0.25 oz 14 0.00 0.00 0.00 0.13 0.23 0.15

+ Heritage 50WG 0.2 oz

9 Tomen Agro TM-41702 40WP 0.5 oz 14 0.00 0.00 0.00 0.03 0.00 0.00

+ Heritage 50WG 0.2 oz

10 Tomen Agro TM-430 50SC 0.267 gal/A 14 0.25 0.00 2.75 0.28 1.05 4.50

11 Tomen Agro TM-430 50SC 0.535 gal/A 14 0.25 0.00 3.00 0.93 2.30 6.00

12 Tomen Agro TM-430 50SC 0.962 gal/A 14 0.75 0.00 3.50 1.33 1.55 5.50

13 Tomen Agro Heritage 50WG 0.3 oz 14 0.00 0.00 0.00 3.95 8.25 18.30

14 Tomen Agro Daconil Ultrex 82.5WDG 3.8 oz 14 0.00 0.00 0.75 0.03 0.00 0.00

15 Novartis CGA 279202 0.42MEC 1.45 fl oz 14 0.00 0.00 0.00 0.03 0.00 0.00

+ Banner MAXX 1.3MEC 1.0 fl oz

16 Novartis Compass 50WG 0.15 oz 14 0.00 0.00 0.00 0.03 0.00 0.00

+ Banner MAXX 1.3 MEC 1.0 fl oz

17 CONFIDENTIAL 7 1.75 1.50 4.75 2.83 6.50 8.75

18 CONFIDENTIAL 7 1.25 0.75 5.00 0.30 3.25 4.75

19 Aventis Chipco Aliette Signature 80WG 4.0 oz 14 0.00 0.00 1.25 0.00 0.00 0.08

+ Chipco 26GT 2SC 4.0 fl oz

20 Aventis Chipco Aliette Signature 80WG 4.0 oz 14 0.00 0.00 0.00 0.13 0.00 0.00

+ Daconil Ultrex 82.5WG 3.8 oz

21 Zeneca Heritage 50WG 0.4 oz 28 0.25 0.25 0.00 2.40 7.75 18.75

22 Tomen Agro TM-43801 4.0 oz 14 0.75 0.25 0.50 3.15 7.75 21.25

23* AgraQuest Serenade 226 g 7 1.00 0.75 3.50 0.78 5.53 4.50