Full TGIF Record # 19840
Item 1 of 1
Publication Type:
i
Report
Author(s):Rosemond, J. M.; Zorner, P. S.; Witt, W. W.
Title:Linuron absorption and translocation in Kentucky bluegrass and nimblewill
Source:Kentucky Turfgrass Research. 1982, p. 55.
Publishing Information:Lexington, KY: University of Kentucky, College of Agriculture, Cooperative Extension Service
Keywords:TIC Keywords: Linuron; Poa pratensis; Muhlenbergia schreberi; Translocation; Injuries; Absorption; Herbicide metabolism; Laboratory tests; Radioactive labeling; Selective herbicides
Abstract/Contents:"Laboratory studies were initiated to determine a possible basis for the chemical selectivity observed in the field between nimblewill and Kentucky bluegrass. Kentucky bluegrass was shown to absorb significantly more 14C-linuron than did nimblewill 3,6, 24 and 48 hrs after treatment. After 96 hrs bluegrass exhibited consistently higher absorption values than did nimbelwill although these differences were not significant. In contrast, at all harvest times, nimblewill translocated significantly more 14C-material than did Kentucky bluegrass. It was shown that 96% or greater 14C-material was located in the treated shoots of bluegrass. No translocation of 14C-material was found in below ground parts of nimblewill and Kentucky bluegrass. The higher absorption and lower translocation of 14C-linuron by Kentucky bluegrass could explain the initial injury observed in the field. Since little 14C-linuron was translocated outside the treated area, especiallly to the crown or rhizomes, recovery or replacement of damaged tissue could be expected. Nimblewill, however, translocated 14C-linuron throughout the foliar portions of the plant including growing stolons and subsequently was not able to recover. To further investigate possible modes of selectivity, studies were initiated to examine the metabolism of 14C-linuron into various metabolites than did nimblewill in the treated shoots. No significant differences between species existed in the metabolites identified as 3-(3,4-dichlorophenyl)-urea. Most of the 14C-activity was found as unidentified or methanol insoluble metabolites. Metabolism of translocated 14C-activity provided similar results. Significantly more 14C-activity identified as linuron was found in nimblewill than in bluegrass. Most 14C-activity in both species was found as unidentified and methanol insoluble metabolites. Data indicated that linuron degradation progressed past the primary and secondary metabolites. Laboratory data indicated that in nimblewill and Kentucky bluegrass there was significant differential linuron absorption, translocation and metabolism. It appeared that the decreased translocation and increased metabolism of foliar absorbed linuron by Kentucky bluegrass, relative to nimblewill could possibly account for the chemical selectivity observed in the field between these two species."
Language:English
References:0
ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Rosemond, J. M., P. S. Zorner, and W. W. Witt. 1982. Linuron absorption and translocation in Kentucky bluegrass and nimblewill. KY. Turfgrass Res. p. 55.
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MSU catalog number: SB 433 .A1 K4
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