Al. Hill et al., AN ASSESSMENT OF THE POSSIBLE REASONS FOR DIFFERENTIAL TOLERANCE TO FLUROXYPYR IN SELECTED POPULATIONS OF GALIUM-APARINE, Weed Research, 36(1), 1996, pp. 15-20
In an investigation of the possible reasons for tolerance to fluroxypy
r by Galium aparine L. (cleavers), a wide range of variation in total
herbicide retention was exhibited by nine diverse populations from thr
oughout Europe. Although these differences in fluroxypyr retention bec
ame negligible when considered on a unit area basis, a two-fold differ
ence was maintained per unit dry matter. There was no difference in fl
uroxypyr uptake between a fluroxypyr-tolerant and a fluroxypyr-suscept
ible population, and differences in translocation between the two popu
lations did not seem to explain the differential tolerance. It is sugg
ested that differential metabolic detoxification may be the main reaso
n for the variation in response to fluroxypyr by populations of G. apa
rine.