Full TGIF Record # 40186
Item 1 of 1
Publication Type:
i
Refereed
Author(s):Keeley, Steven J.; Branham, Bruce E.; Penner, Donald
Author Affiliation:Horticulture Department, Kansas State University, Manhattan, KS 66506, Corresponding Author, Department of Natural Resources and Environmental Sciences, University of Illinois, Urbana, IL 61801, and Crop and Soil Sciences, Michigan State University, East Lansing, MI 48824-1325
Title:Adjuvant enhancement of large crabgrass (Digitaria sanguinalis) control with dithiopyr
Source:Weed Science. Vol. 45, No. 2, March/April 1997, p. 205-211.
Publishing Information:Champaign, IL: Weed Science Society of America
# of Pages:7
Keywords:TIC Keywords: Adjuvants; Volatility; Dithiopyr; Digitaria sanguinalis; Postemergence herbicides; Preemergence herbicides; Uptake
Abstract/Contents:"A greenhouse study was conducted to determine the effectiveness of adjuvants on postemergence large crabgrass control with dithiopyr. Using barriers to isolate foliage or soil, the primary site of dithiopyr uptake was found to be via foliage. Laboratory and greenhouse studies elucidated the factors involved in enhancement of crabgrass control by dithiopyr with nine superior adjuvants. Two adjuvants increased dithiopyr absorption by 3.7 to 4.3% over the herbicide alone. However, none of the adjuvants increased dithiopyr translocation out of the treated leaf. Treatment of a single large crabgrass leaf indicated that the enhancement of dithiopyr activity by adjuvants involved an effect on translocation, on spray retention, and on the external movement of the spray solution to the apical meristem, with the relative importance of any 1 factor depending on the particular adjuvant used. Because of the large losses of dithiopyr during absorption/translocation studies, a separate volitilization experiment determined that 70% of applied dithiopyr volatilized within 24 h at 24 C. Dithiopyr absorption decreased and volatilization increased with each 10 C increase in temperature. Nonrecoverable dithiopyr ranged from 46 to 55% at 5 C to 92 to 95% at 35 C. Volatility losses of this magnitude may mitigate adjuvant enhancement of postemergence grass activity of dithiopyr."
Language:English
References:15
Note:Graphs
Tables
ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Keeley, S. J., B. E. Branham, and D. Penner. 1997. Adjuvant enhancement of large crabgrass (Digitaria sanguinalis) control with dithiopyr. Weed Sci. 45(2):p. 205-211.
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