Full TGIF Record # 4930
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Publication Type:
Content Type:Abstract or Summary only
Author(s):Christians, N. E.
Author Affiliation:Assistant Professor of Horticulture, Department of Horticulture, Iowa State University, Ames, IA
Title:Effects of preemergence herbicides on four cultivars of Kentucky bluegrass
Section:Turf, ornaments and aquatics
Other records with the "Turf, ornaments and aquatics" Section
Source:Proceedings of the North Central Weed Control Conference. Vol. 36, 1981, p. 37.
# of Pages:1
Publishing Information:Omaha, NB
Keywords:TIC Keywords: Application rates; Bensulide; Cultivar evaluation; DCPA; Herbicide evaluation; Oxadiazon; Poa pratensis; Preemergence herbicides
Cultivar Names:Baron; Enmundi; Newport; Park
Abstract/Contents:"The effects of 3 preemergence herbicides on 4 cultivars of Kentucky bluegrass were studied to evaluate the differential response of these cultivars to the herbicides. The 4 cultivars used in the study were Baron, Enmundi, Newport, and Park. The greenhouse study was arranged in a split-plot design with cultivars as main plots and preemergence herbicide treatments as subplots. Herbicide treatments included bensulide at 8.4 and 15.7 kg/ha as a 46% emulsifiable concentrate formation; DCPA at 11.8 and 16.8 kg/ha as a 75% wettable powder (75 w) formulation; and oxadiazon at 2.2, 4.5, and 9 kg/has as a 2 G formulation. The rates of bensulide and DCPA are the recommended rates for control of crabgrass and annual bluegrass, respectively. The rates of oxadiazon correspond to the low and high recommended rates, plus the 9 kg/ha rate, which is equivalent to an overlap application of the high rate. Each treatment, plus an untreated control, were replicated 3 times. The units were maintained at a 5 cm mowing height and were fertilized at a rate of 25 kg N/ha/month with a 20-20-20 analysis fertilizer. The grasses were watered biweekly with 350 ml of water/pot throughout the study. Although root weight was reduced by bensulide and oxadiazon, no cultivar differences were found with respect to this measurement. Cultivar by herbicide interactions were found for both rhizome numbers and clipping weight. Most of the variability in clipping weight could be attributed to the cultivar by oxadiazon rate interaction. Similar cultivar by oxadiazon rate interactions were present for rhizome length, rhizome weight, and quality rating. In most cases, the cultivars Enmundi and Park showed little damage under the conditions of this study. Oxadiazon is considered to be quite damaging to Kentucky bluegrass under certain conditions, and it is also somewhat more expensive than the other preemergence herbicides presently available for use on turfgrasses. It does have certain advantages, however. Oxadiazon is known to be an excellent control for goosegrass, whereas the other preemergence herbicides are less effective against this species. The results of the present investigation indicate that oxadiazon can be detrimental to Kentucky bluegrass growth and development, particularly at higher rates of application. However, the damage varies with cultivar. This information suggests that the sod industry, which often experiences problems with goosegrass, could select cultivars of Kentucky bluegrass with greater tolerance to oxadiazon. Further work should be performed to identify other cultivars that demonstrate similar degrees of tolerance to this herbicide."
Note:This item is an abstract only!
ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Christians, N. E. 1981. Effects of preemergence herbicides on four cultivars of Kentucky bluegrass. Proc. North Cent. Weed Sci. Soc. 36:p. 37.
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