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The effect of CGA 43089 as a safener of metolachlor in sorghum ( Sorghum bicolor ) (Recordings of elongation rates on single sorghum leaves)
Author(s) -
CHRIST R.A.
Publication year - 1981
Publication title -
weed research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.693
H-Index - 74
eISSN - 1365-3180
pISSN - 0043-1737
DOI - 10.1111/j.1365-3180.1981.tb00089.x
Subject(s) - sorghum , metolachlor , sorghum bicolor , chemistry , elongation , agronomy , pesticide , biology , atrazine , materials science , ultimate tensile strength , metallurgy
Summary: The influence of metolachlor [2‐chloro‐6‐ethyl‐ N ‐(2‐methoxyl‐methylethyl)acet‐ o ‐toluidide] on sorghum ( Sorghum bicolor Moench.) is first demonstrated in order to be able to show the difference observed when this herbicide is applied together with CGA 43089. The effect of various concentrations (in nutrient solution) and of various exposure times on the elongation rate of single leaves is demonstrated. The safener CGA 43089 (x‐(cyanomethoximino)‐benzacetonitrile] showed no effect on the elongation rates when used in normal concentrations. The combined application of safener and metolachlor (concentration ratio 1:3) prevented the growth reductions due to metolachlor. When the safener was applied before metolachlor the safening action was as good as that of the combined application. When the safener was applied 1 or 2 days after the herbicide the safening effect was diminished. Plant uptake of the safener over a period of 3 days was sufficient to prevent the action of metolachlor but the safening effect was reduced when the interval between the end of safener application and the beginning of the herbicide application was increased. The conclusion drawn regarding the mode of action is that CGA 43089 does not interfere with herbicide uptake into the plant. The safener is, however, able to reduce the active amount of herbicide when present at the right time at the site of effect.