98 GENERAL SESSION. Dollar Spot Fungicide Trial Hancock Turfgrass Research Center. Michigan State University, East Lansing, MI
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1 98 GENERAL SESSION Dollar Spot Fungicide Trial Hancock Turfgrass Research Center Michigan State University, E. Lansing, MI The 1995 dollar spot (Sclerotinia homoeocarpa fungicide trial was conducted on an irrigated Emerald creeping bentgrass green at the Hancock Turfgrass Research Center on the MSU campus in E. Lansing, MI. The green was maintained at 1/4" height of cut and was fertilized at 1/2 Ib N./mo. Treatments were initially applied to mildly diseases 2' x 9' plots in four replications of a random block design on 7, 14,21, or 28 day schedules as indicated on the data tables (Tables 9 & 10, beginning on 7/29/95. By the last rating date (10/28/95, the 7 day treatments had been applied 9 times, the 14 day treatments had been applied 5 times, the 21 day treatments had been applied three times, and the 28 day treatments were applied three times. The dollar spot strains in this test location are benzimidazole-resistant. As data tables 9 and 10 indicate, most treatments gave statistically significant dollar spot control, compared to the fertilized and unfertilized controls. By the latest rating data (9/28/95, most of the standard dollar spot fungicides exhibited none, or very little disease, and were statistically insignificant from each other. No phytotoxicity was observed in this study this year. Table 9. Dollar Spot Fungicide Study Hancock Turfgrass Research Center Michigan State University, East Lansing, MI Rating Scale: o = no disease, 10 = 100% of plot diseased. (10 = best quality, (0 = worst quality, (7.5 = acceptable quality Rating Date: 9/4/95 Treatment Rate/WOO W b Interval I d II III IV Avg Ch (WP 2.0oz 14 days 0(8 0(8 0(8 0(8 0(8.0 RCOI 0.15 oz ai 14 days 0(7 0(8 0(8 0(8 0(7.8 RC oz ai 14 days 0(7 0(8 0(7 0(8 0(7.5 Lynx + Dac. Ultrex 0.5 oz oz 14 days 0(8 0(8 0(9 0(8 0(8.3 Bayleton + Dac. Ultrex 0.5 oz oz 14 days 0(8 0(8 0(8 0(8 0( fl oz 14 days 0(8 0(8 0(9 0(9 0( fl oz 14 days 0(8 0(8 0(8 0(8 0( fl oz 14 days 0(8 0(8 0(8 0(9 0( fl oz 14 days 0(9 0(9 0(9 0(8 0( b ai/a 21 days 0(7 0(8 0(7 0(7 0(7.3 Eagle alternated with Ch (WDG 0.6 oz & 2.0 oz 21 days 0(7 0(7 0(7 0(7 0(7.0 EXPI0682A 7.0oz 21 days 0(7 0(8 0(8 0(8 0(7.8 Dac fl oz 14 days 0(8 0(8 0(8 1C(8 0.3(8.0 Banner (GL + Ch (FLO 0.3 fl oz fl oz 21 days 0(7 0(8 0(7 IC(8 0.3(7.5 Banner (MC + Ch (FLO 5.0 fl oz oz 21 days 0(8 1"(8 0(8 0(8 0.3(8.0
2 VARGAS tl oz oz 21 days 0(7 0(8 1C(7 0(8 0.3(7.5 HI 5.0 tl oz oz 21 days 0(8 1C(8 0(9 0(9 0.3(8.5 HI 3.50z 21 days 0(8 1C(8 0(7 0(8 0.3(7.8 HI 3.8oz 14 days 0(7 1C(9 1C(7 0(8 0.5(7.8 GHI 3.50z 14 days 0(8 1C(7 1C(8 1C(7 0.7(7.5 F-I 1.351b. ai/a b. ai/a 21 days 1C(7 1(6 0(9 1C(8 0.7(7.5 F-I 0.9 tl oz oz 21 days 1(7 1C(8 0(7 1C(8 0.7(7.5 F-I 3.0 tl oz 21 days 1C(8 1C(7 1C(7 0(7 0.7(7.3 F-I 1.0oz 21 days 1C(7 1(7 1C(7 0(7 0.7(7.0 F-I 2.0oz 21 days 1C(7 1C(8 1C(8 0(7 0.7(7.5 F-I Sentinel 0.167oz 28 days 1C(7 0(7 1C(8 1C(7 0.7(7.3 Spectra C 5.0oz 14 days 1C(8 1C(8 1(7 1C(7 1.0(7.5 S b 14 days 1(7 1(6 1(7 1(6 1.0(6.5 S b 14 days 1(7 1(6 1C(7 1(7 1.0(6.8 Lynx + Prastar 1.0 oz oz 21 days 1C(8 1(6 1(7 1C(7 1.0( b. ai/a + 41b. ai/a 21 days 1C(7 1(6 1C(7 1C(7 1.0(6.8 E-I 0.3 tl oz 21 days 1(7 1(71 1C(7 1C(7 1.0(7.0 E-I 0.31 oz 21 days 1(6 1(6 1(7 1(6 1.0(6.3 E-I 0.31 oz oz 21 days 1C(7 1(7 1C(7 1(7 1.0(7.0 E-I
3 100 GENERAL SESSION 0.6oz 21 days 1(7 1(7 1.0(7.0 E-I 21 days 1«8 1«8 1«7 1«7 1.0(7.5 E-I 21 days 1(7 1«7 1(6 1(7 1.0(6.8 E-I 21 days 1(7 1(6 1(6 1(7 1.0(6.5 E-I 21 days 1(6 1(6 1«7 1«8 1.0(6.8 E-I 21 days 1«8 1«7 1«8 1«7 1.0(7.5 E-I 21 days 1«7 1«7 1«7 1«8 1.0(7.3 E-I 21 days 1(7 2(6 1(7 1(7 1.3(6.8 E-I 21 days 2(6 1«7 1(7 1«7 1.3(6.8 E-I 21 days 2(6 1(7 1«8 1«7 1.3(7.0 E-I 14 days & monthly 1(7 2(7 1«7 1(7 1.3(7.0 E-I 7 days 4(5 1(6 1«7 1(6 1.8(6.0 D-I 7 days 3(5 1(6 1(6 2(5 1.8(5.5 D-I 21 days 2(6 2(5 2(6 1(6 1.8(5.8 D-I 14 days 2(6 2(5 2(5 2(6 2.0(5.5 C-I 21 days 2(5 2(6 2(5 3(5 2.3(5.3 B-H 21 days 2(5 3(5 3(5 1«7 2.3(5.5 B-H 21 days 3(6 2(5 2(6 3(5 2.5(5.5 A-G 21 days 3(5 4(4 2(5 2(6 2.8(5.0 A-F
4 VARGAS days 2(5 6(3 2(6 2(6 3.0(5.0 A-E 21 days 2(4 3(6 5(3 3(5 3.3(4.5 A-E 3(5 4(5 5(3 3(5 3.8(4.5 A-D 4(4 5(3 3(5 3(4 3.8(4.0 A-D monthly 4(4 7(2 2(5 3(4 4.0(3.8 ABC Pros tar 3.00z 21 days 5(3 6(4 4(5 3(4 4.5(4.0 "Treatment disease averages followed by same letterare not significantly different from each other at the 5% level (Tukeys Honestly Significant Differences Test. brates are formulation unless indicated as active ingredient (ai or otherwise. CPlot has fewer than 10 small dollar spots. dratings in parentheses indicate turf quality.
5 102 GENERAL SESSION Table 10. Dollar Spot Fungicide Study Hancock Turfgrass Research Center Michigan State University, E. Lansing, MI Rating Scale: o = no disease, 10 = 100% of plot diseased (10 = best quality, (0 worst quality. (7.5 = acceptable quality Rating Date: Sept. 28, 1995 Treatment Ra te/looo fr b Interval I d II III IV Ch (FLO 3 fl oz 21 day 0(7 0(7 0(7 0(8 Ch (WDG 20z 21 day 0(8 0(8 0(8 0(8 EXP 10682A 3.50z 21 day 0(7 0(8 0(8 0(8 EXP 10682A 70z 21 day 0(7 0(8 0(8 0(8 Curalan loz 21 day 0(8 0(7 0(8 0(8 Twosome 3 fl oz 21 day 0(8 0(8 0(8 0(7 Thalonil(F + Lynx 5 fl oz oz 21 day 0(8 0(8 0(9 0(8 Thalonil(F + Bayleton 5 fl oz oz 21 day 0(7 9(8 0(7 0(8 Thalonil(F + Banner 5 fl oz fl oz 21 day 0(8 0(8 0(8 0(8 Banner(MC + Ch (FLO 0.9 fl oz + 2 fl oz 21 day 0(8 0(8 0(8 0(8 Banner(GL + Ch (FLO 0.3 fl oz + 2 fl oz 21 day 0(7 0(8 0(8 0(8 Curalan 2.71b ai/a 21 day 0(8 0(7 0(8 0(8 Dac fl oz 14 day 0(9 0(9 0(9 0(9 Ch (WP 20z 14 day 0(8 0(8 0(8 0(8 RCOI 0.150zai 14 day 0(7 0(8 0(8 0(8 RC oz ai 14 day 0(7 0(8 0(8 0(8 Lynx + Dac. Ultrex 0.5 oz oz 14 day 0(9 0(8 0(9 0(8 Bayleton + Dac. Ultrex 0.5 oz oz 14 day 0(8 0(8 0(8 0(8 Thalonil (4L 6 fl oz 14 day 0(9 0(9 0(9 0(8 IB fl oz 14 day 0(8 0(8 0(8 0(9 IB fl oz 14 day 0(8 0(9 0(8 0(9 Dac. Ultrex 3.8oz 14 day 0(8 0(9 0(8 0(8 IB fl oz 14 day 0(9 0(9 0(9 0(8 Spectro C 50z 14 day 0(8 0(8 0(8 0(8 Dac & Primo 6 fl oz Ib ai/a 14 days & monthly 0(8 0(8 0(9 0(8 Thalonil(DF 3.50z 14 days 0(9 0(8 1«9 0(8
6 VARGAS 103 Curalan + Dac. Ultrex 1.35 Ib ai/a + 4 Ib ai/a 21 days 0(7 1C(8 0(8 0(8 Banner(MC + Dac. Ultrex 0.9 fl oz oz 21 days 0(7 0(9 0(8 1C(8 Eagle alternated wi Ch (WDG 0.6 oz & 2 oz 21 days 0(0 1C(7 0(7 0(8 Curalan + Fungo Ib ai/a Ib ai/a 21 days 1C(7 1C(9 0(8 0(8 EXP 10702A 3 fl oz 21 day 0(8 1C(9 1«8 0(8 Sentinel 0.167oz 28 day 1C(7 1C(7 0(9 1«8 Rubigan AS 1.5 fl oz 21 day 1C(7 1C(7 0(7 1C(8 Banner(GL + Dac. Ultrex 0.3 fl oz oz 21 day l C (6 0(8 1C(7 l C (7 S b 14 day 1(6 1(6 1(7 1«7 S b 14 day 1(7 1C(7 1C(7 1«7 Banner(GL 0.3 fl oz 21 day 1(7 1«7 1«7 1«8 Banner (WP 0.31 oz 21 day 1(6 1«6 1(7 1(7 Banner(WP + Dac. Ultrex 0.31 oz oz 21 day 1«7 1C(7 1C(7 1C(7 Eagle 0.6oz 21 day 1«7 1C(7 1(7 1«7 Bayleton + Prostar 1 oz + 2 oz 21 day 1C(8 1(7 1«7 1C(7 Rubigan AS 0.75 fl oz 21 day 1(7 1(7 1«6 IC(7 Rubigan AS+ Prostar 0.75 fl oz + 2 oz 21 day 1(6 1(6 1(6 1«7 Rubigan AS + Pros tar 1.5 fl oz + 2 oz 21 day 1«7 1(7 1«7 1C(7 Lynx + Pros tar 1 oz + 2 oz 21 day 1C(7 2(6 1(6 1C(7 Banner(MC 0.9 fl oz 21 day 2(6 1(7 1C(7 1«7 V-I gm. 7 day 4(5 1(6 1C(7 1(6 F fl oz 21 day 2(6 3(5 2(6 0(8 V gm. 7 day 3(5 1(6 2(5 3(5 F fl oz 21 day 2(5 2(5 2(6 3(5 Dac. Ultrex 1.250z 21 day 3(5 2(5 1(6 3(6 Rubigan AS + Prostar 0.38 fl oz + 1 oz 21 day 3(6 3(5 2(6 2(6 F fl oz 21 day 3(4 3(4 2(5 2(6 Cleary z 14 day 3(5 3(5 3(5 3(5 Pros tar 20z 21 day 3(5 2(6 5(3 4(4 Primo 0.09 Ib ai/a monthly 4(4 5(3 3(5 4(4 Control( fert. 4(3 4(5 5(3 3(5 Prostar 30z 21 day 5(3 5(3 4(3 5(3
7 104 GENERAL SESSION Control (unfert. "Treatment disease rating averages followed by same letter are not significantly different from each other at the 5% level. brates are formulation per 1000 ~ unless indicated as active ingredient (ai or otherwise. eplot has fewer than 10 small dollar spots. dratings in parentheses indicate turf quality. 5(3 6(3 4(3 5(4
8 VARGAS 105 Compounds Tested in Season Product Trade Name formulation Manufacturer Aliette WDG 80 WDG Rhone- Poulenc AMV6 Amvac Chern. Co AMV 30 Amvac Chern. Co ANDFG ANDFG 190 The Andersons Banner 1.1 EC Ciba Geigy Corp. Banner (GL Ciba Geigy Corp. Banner (MC Ciba Geigy Corp. Banner (WP Ciba Geigy Corp. Bayleton 25 DF Miles Corp. Calo-Clor 90WP a.m. Scotts & So Calo-Gran 2.7G a.m. Scotts & So CGA-O Ciba Geigy Corp. Chip co FLO 25 F Rhone Poulenc Chipco WDG 50 WDG Rhone Poulenc Chipco (WP 50WP Rhone Poulenc Cleary WP WP.A. Cleary Ch Consyst 67WP Regal Chemical C Curalan 50DF BASF Corp. Cutless 50W Dow Elanco Daconil F ISK Biotech Daconil Ultrex 82.5 WDG ISK Biotech Defend 2F WP.A. Cleary Ch Dithane M-45 80WP Rohm & Haas Eagle 40WP Rohm & Haas
9 Embark 106 GENERAL SESSION 2S PBI/Gordon EXP A EXP 10682A EXP A EXP A Fluazinam F Rhone Poulenc Rhone Poulenc Rhone Poulenc Rhone Poulenc ISK Biotech Fore Fungo 85 Herbruck's Fertilizer Heritage IB W 85 DF WDG Rohm & Haas O.M. Scotts & S Herbrucks Zeneca Ag Prods ISK Biotech IB IB Latron CS-7 Lesco R Lesco R Lynx Surfactant 25DF ISK Biotech ISK Biotech Rohm & Haas Lesco Miles, Inc. Menafee Humate F-53 Panasea Plus PCNB Primo Soil conditioner 2 EC N/A 75 WP 1 EC Earthgreen Prod Dow Elanco Emerald Isle Am vac Chem. Ciba Geigy Cor Prostar RC01 RC02 Revere 50 WP 75 WDG Nor-Am Regal Chemical Regal Chemica Lesco
10 VARGAS 107 RH WP Rohrn& Haas Rizolex 75WP Sandoz Agro, Inc. Rubigan AS 1.1F Oow Elanco Rubigan (WP 50WP Oow Elanco S-6115 a.m. Scotts & So S-6128 a.m. Scotts & So Scotts Fertilizer & Fungicide II (FF II fert., 15.4% PCNB a.m. Scotts & So Sentinel 40 WOG Sandoz Agro, Inc. Spotrete 75 WOG W.A. Cleary Che Subdue 2E Ciba Geigy Corp. Terraclor 75WP Uniroyal Chern. Thalonil (OF 90 OF Terra Thalonil (F 4F Terra Turfcide log logr Uniroyal Chern. Turfcide 400 4F Uniroyal Chern. Turf Enhancer 2 SC a.m. Scotts & So UBI 9249 Uniroyal Chern. UBI 9250 Uniroyal Chern. V-I0028 Valent Vigoro GS, etc. Vigoro Vorlan 50 OF a.m. Scotts & So
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