1999 Iowa Turfgrass Research Report

This is the final year of data from the Fairway Height Bentgrass Cultivar trial established in the fall of 1993. Data collection began after the cultivars were fully established in July, 1994. The area was maintained at a 0.5-inch mowing height. This was a National Turfgrass Evaluation (NTEP) trial and was conducted at several research stations in the U.S. It contained 21 of the newest seeded cultivars and a number of experimentals. The cultivars were maintained with 4 lbs of N/1000 ft²/growing season. Fungicides are used as needed in a preventative program. Herbicides and insecticides were applied as needed.

Visual quality ratings were taken from May through August 1998 (Table 1). Visual quality was assessed using a 9 to 1 scale with 9 = best, 6 = lowest acceptable, and 1 = worst quality. Genetic color (Color), spring greenup (Green), and leaf texture (Leaf) were evaluated in August 1998. Genetic color was based on a 9 to 1 scale with 9 = dark green and 1 = light green. Spring greenup was evaluated using a 9 to 1 scale with 9 = best and 1 = worst greenup. Leaf texture was estimated using a 9 to 1 scale with 9 = fine and 1 = coarse texture.

A new Fairway Height Bentgrass Cultivar trial was established in September 1998. It contains 26 cultivars and the study will be maintained under the same guidelines as the 1993 study. The only data taken for this study in 1998 were for fall percentage living cover (Table 2).

Table 1. 1998 visual quality and other physical ratings for cultivars in the 1993 Fairway Height Bentgrass Trial.

					Quality
	Cultivar	Color	Green	Leaf	May	June	July	Aug	Mean
1	Trueline	7.7	5.7	6.7	7.0	7.0	7.0	7.3	7.1
2	BAR Ws 42102	6.0	5.3	6.7	7.7	7.0	7.0	6.0	6.9
3	Southshore	6.0	6.3	7.7	7.7	7.3	6.7	6.0	6.9
4	18th Green	6.3	6.0	6.7	6.7	6.7	7.0	7.0	6.8
5	Penn G-6	5.7	5.7	7.0	6.7	7.7	7.0	6.0	6.8
6	Penn G-2	6.0	5.7	6.3	7.3	6.7	7.0	5.7	6.7
7	Lopez	5.7	5.7	6.0	6.7	6.7	6.3	6.3	6.5
8	Crenshaw	6.0	6.3	7.3	7.0	6.0	6.7	6.0	6.4
9	Seaside II (DF-1)	5.7	5.7	7.3	6.7	6.0	7.0	5.7	6.3
10	Providence	5.7	6.3	6.0	6.3	7.0	6.0	5.3	6.2
11	Seaside	7.7	4.7	5.0	6.0	6.0	6.0	6.3	6.1
12	Cato	5.3	6.7	7.3	6.7	6.3	6.3	5.0	6.1
13	PRO/CUP	7.0	6.0	6.0	6.0	6.3	5.7	6.3	6.1
14	Penncross	7.0	5.3	5.3	6.0	6.0	5.7	6.7	6.1
15	Penneagle	6.3	6.3	7.0	6.3	6.3	6.0	5.7	6.1
16	BAR As 492	6.0	5.3	5.7	6.0	6.0	5.7	6.0	5.9
17	ISI-At-90162*	6.0	5.7	5.3	6.3	6.0	5.3	5.3	5.8
18	Pebble*	7.0	5.0	5.3	5.7	5.3	5.7	6.0	5.7
19	Exeter	6.0	5.3	5.7	5.3	5.3	5.3	6.0	5.5
20	Tendenz*	6.3	5.0	5.0	5.3	4.7	5.3	5.7	5.3
21	SR 7100*	6.0	5.3	5.0	5.3	5.0	4.7	5.3	5.1
	LSD(0.05)	1.3	P>F=0.07 1.1	1.0	NS	1.3	P>F=0.07 1.6	NS	NS

* Colonial Bentgrass

Color (Genetic color): 9 = dark green and 1 = light green. Green (Greenup): 9 = best and 1 = worst greenup. Leaf (Leaf texture): 9 = fine and 1 = coarse.

Visual quality was assessed using a 9 to 1 scale with 9 = best, 6 = lowest acceptable, and 1 = worst quality.

NS = means are not significantly different at the 0.05 level.

 

Table 2. Percentage fall living cover data¹ for cultivars in the 1998 Fairway Height Bentgrass Trial.

	Cultivar	Percentage fall cover (%)
1	Backspin	78.3
2	Century	78.3
3	Penneagle	76.7
4	SR 1119	73.3
5	Trueline	71.7
6	Providence	70.0
7	Penn G-6	70.0
8	Imperial	68.3
9	Grand Prix	66.7
10	Seaside II	66.7
11	PST-9HG*	65.0
12	Penncross	65.0
13	Princevill	63.3
14	Tiger	63.3
15	PST-OVN	63.3
16	SRX 1BPAA	61.7
17	L-93	58.3
18	Seaside	58.3
19	SRX 1120	58.3
20	GolfStar**	58.3
21	ABT-Col-2*	56.7
22	SRX 7MOBB*	55.0
23	PST-9PM*	53.3
24	ISI At-5*	50.0
25	SR 7100*	50.0
26	SRC 7MODD*	45.0
	LSD(0.05)	17.0

¹These figures represent the percentage area per plot covered by bentgrass.

*Colonial Bentgrass

** Idaho Bentgrass

ISU Horticulture:Publications:1999 Turfgrass Report

College of Agriculture