Full TGIF Record # 42166
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Web URL(s):http://www.newss.org/proceedings/proceedings_1996_vol50.pdf#page=114
    Last checked: 07/24/2013
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Publication Type:
i
Report
Content Type:Abstract or Summary only
Author(s):Martin, D. P.; Sullivan, J. J.
Author Affiliation:Dir. of Research and Research Assoc.; TruGreen ChemLawn; Delaware, OH
Title:Influence of annual herbicide applications and the environment on smooth crabgrass control
Meeting Info.:Williamsburg, VA; January 2-5, 1996
Source:Proceedings of the 50th Annual Meeting of the Northeastern Weed Science Society. Vol. 50, 1996, p. 114.
Publishing Information:College Park, MD: Northeastern Weed Science Society
# of Pages:1
Keywords:TIC Keywords: Crabgrass control; Digitaria; Digitaria ischaemum; Environmental factors; Herbicide interaction; Herbicide timing; Seasonal variation
Abstract/Contents:"Annual spring application of preemergence herbicides are commonly used in turfgrass culture to control annual weed grasses such as crabgrass. Siginificant year-to-year variation is observed on the percent crabgrass control, even when factors such as product, rate, competition, etc. appear to be comparable. The objective of this paper is to compare year-to-year variation of temperature and rainfall on percent smooth crabgrass [Digitaria ischaemum (Schreb. ex Schweig.) Schreb. ex Muhl] control with pendimethalin applications (1.5 lb ai/A). Field studies were conducted from 1985 to 1995 on a site with ‘Kenblue' Kentucky bluegrass (Poa pratensis L.). Maintenance practices were designed to enhance potential crabgrass populations. The study areas were laid out in six by eight foot plots in a randomized complete block design with three replications. The actual treatments were four by eight, resulting in a two foot untreated check strip surrounding each plot. Treatments were made with a three nozzle boom assembly at the end of a ChemLawn gun, and charged with a CO₂ pressurized tank worn as a backpack. Pendimethalin at1.5 lb ai/A as a Pre-M 60DG was applied in a number of studies annually between mid-March and the germination date, usually late April. The rate of 1.5 lb was choosen since it is the threshold rate for this geographical area. Results were averaged for each year. Crabgrass control was acceptable seven of eleven years. For the seven acceptable years crabgrass control averaged 94% with a high of 98% in 1994. Crabgrass control was marginal in 1989 at 85%. Poor crabgrass control was observed in 1987 and 1993 at 73% and 76% respectively. Crabgrass control during the 1995 season was totally unacceptable with an average of 23% control from pendimethalin at 1.5 lb ai/A. Total rainfall and temperature averages were calculated by week and by month for May-August and compared to crabgrass failure years. Three of four failure years had higher than average rainfall in May and June, creating good crabgrass germination and growth conditions. In addition, those years also had a dry August and very hot conditions in July and August, favoring crabgrass growth over Kentucky bluegrass. The marginally acceptable crabgrass year in 1989 had above average moisture conditions from May -July and below average temperatures. The major factor in 1989 may have been the lack of density in turfgrass stands caused by the 1988 drought. Temperatures above average one year and average another year also resulted in acceptable crabgrass control. Low moisture conditions through most of the May to August period in those years reduced crabgrass development and competition. Also, wet, cool summers in several other years resulted in less competition and good crabgrass control compared to the hot, wet years. This research has shown that above average rainfall in May/June, followed by dry conditions in August, along with higher than average temperatures in August or July/August, resulted in unacceptable smooth crabgrass control with pendimethalin."
Language:English
References:0
Note:This item is an abstract only!
ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Martin, D. P., and J. J. Sullivan. 1996. Influence of annual herbicide applications and the environment on smooth crabgrass control. Proc. Annu. Meet. Northeast. Weed Sci. Soc. 50:p. 114.
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http://www.newss.org/proceedings/proceedings_1996_vol50.pdf#page=114
    Last checked: 07/24/2013
    Requires: PDF Reader
    Notes: Item is within a single large file
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MSU catalog number: SB 610 .N62 v. 50
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