1999 Iowa Turfgrass Research Report

This is the final year of data from the Green Height Bentgrass Cultivar trial established in the fall of 1993. The area was maintained at a 3/16-inch mowing height. This was a National Turfgrass Evaluation Program (NTEP) trial and was conducted at several research stations in the U.S. It contained 28 seeded cultivars, including a number of experimentals.

The cultivars were maintained with a fertilizer program of 1/4 lb N applied at 14-day intervals with a total of 4 lbs of N/1000 ft²/growing season. Fungicides were used as needed in a preventive program. Herbicides and insecticides were applied as needed.

A new Green Height Bentgrass Cultivar trial was begun in September 1998. Twenty-six cultivars including numerous experimentals are being screened. The only data collected from this study in 1998 were estimates of the percentage of green ground cover taken in the fall.

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

					Quality
	Cultivar	Color	Green	Leaf	May	June	July	Aug	Mean
1	Penn G-2 (G-2)	6.3	6.0	7.7	7.3	8.0	7.7	7.0	7.5
2	Crenshaw	7.0	6.7	6.7	7.0	6.7	7.3	7.0	7.0
3	Imperial (Syn 92-5)	6.0	6.0	7.3	7.0	7.7	7.3	6.0	7.0
4	Penn A-1 (A-1)	6.7	6.3	7.7	6.3	7.0	7.3	7.3	7.0
5	Penn G-6 (G-6)	6.3	6.0	6.3	7.0	7.0	7.7	6.0	6.9
6	Penn A-4 (A-4)	5.7	5.7	7.3	6.7	7.0	6.7	6.0	6.6
7	BAR Ws 42102	6.0	5.0	6.3	6.7	7.0	6.7	5.7	6.5
8	Century (Syn 92-1)	5.3	5.7	7.0	6.7	6.7	6.7	6.0	6.5
9	Backspin (Syn 92-2)	5.7	6.0	7.0	6.7	7.0	6.3	5.7	6.4
10	Regent	6.0	5.0	6.0	6.3	6.0	7.0	6.0	6.3
11	Cato	5.3	6.0	6.3	6.0	6.3	7.0	5.7	6.3
12	Southshore	5.7	5.3	6.7	6.3	6.0	6.7	6.3	6.3
13	Providence	6.7	5.3	6.3	5.7	5.3	7.0	7.0	6.3
14	SR 1020	4.7	5.7	7.3	6.3	6.3	6.7	6.0	6.3
15	Loft's L-93 (L-93)	6.0	5.3	6.0	6.0	6.3	6.3	6.3	6.3
16	PRO/CUP	5.7	5.0	5.0	6.0	6.0	6.0	6.0	6.0
17	Pennlinks	6.0	5.0	6.0	6.0	6.0	5.7	6.3	6.0
18	18th Green	6.0	6.0	6.0	5.7	6.0	6.0	6.0	5.9
19	ISI-Ap-89150	6.0	5.7	5.7	5.3	5.7	6.0	6.7	5.9
20	BAR As 492	6.0	5.7	5.7	5.7	5.3	6.0	6.3	5.8
21	Trueline	5.0	4.3	6.0	5.7	6.0	5.7	5.7	5.8
22	Penncross	5.7	5.3	5.3	5.7	6.0	5.3	6.0	5.8
23	DG-P	6.0	5.0	5.7	6.0	5.3	6.0	5.7	5.8
24	MSUEB	5.7	5.0	6.0	5.7	6.0	6.0	5.7	5.8
25	Lopez	5.7	4.3	5.7	5.7	6.0	5.7	5.7	5.8
26	Mariner (Syn-1-88)	6.3	5.0	6.0	5.3	5.7	6.3	5.7	5.8
27	Tendenz*	6.0	5.3	5.3	5.3	4.7	5.0	5.3	5.1
28	Seaside	5.3	4.7	5.0	5.0	5.0	4.7	5.0	4.9
	LSD(0.05)	NS	1.1	1.0	NS	1.4	1.1	NS	1.0

* 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.

Quality based on a scale of 9 to 1: 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 Green Height

Bentgrass Trial.

	Cultivar	Percentage fall cover (%)
1	Backspin	81.7
2	Penn A-4	78.3
3	Imperial	76.7
4	Providence	76.7
5	ISI Ap-5	75.0
6	Pennlinks	75.0
7	Penncross	75.0
8	Penn A-2	75.0
9	L-93	73.3
10	Syn 96-2	73.3
11	SR 1119	73.3
12	ABT-CRB-1	71.7
13	BAR AS 8FUS2	71.7
14	SR 7200*	71.7
15	Penn G-1	71.7
16	Penn A-1	71.7
17	Bavaria*	70.0
18	Pick CB 13-94	70.0
19	SRX 1BPAA	70.0
20	Century	68.3
21	BAR CB 8US3	68.3
22	Pick MVB*	68.3
23	Syn 96-1	68.3
24	SRX 1120	68.3
25	SRX 1NJH	68.3
26	Crenshaw	66.7
27	PST-A2E	66.7
28	Penn G-6	66.7
29	Syn 96-3	65.0
	LSD(0.05)	NS

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

*Velvet Bentgrass

ISU Horticulture:Publications:1999 Turfgrass Report

College of Agriculture