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STUDIES ON HERBICIDE CONTENTS IN ROOTS OF SKELETON WEED ( CHONDRILLA JUNCEA L.) FOLLOWING LEAF APPLICATIONS
Author(s) -
GREENHAM C. G.
Publication year - 1968
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.1365-3180.1968.tb01431.x
Subject(s) - dicamba , chemistry , weed , triclopyr , ammonium , horticulture , botany , weed control , agronomy , chemical control , biology , organic chemistry
Summary. The herbicides studied were 2,4‐D, 2,4‐DB, dicamba and orthoarsenic acid. Herbicide content in the roots was taken as an overall measure of penetration into and absorption by the leaves, and of translocation to the roots. A significantly greater 2,4‐D content resulted from foliar application at pH 3–5 than at higher values, though at pH 8–5 the inclusion of triethanolamine significantly increased the 2,4‐D content. No evidence was obtained that a greater 2,4‐D content should result from foliage applications of 2,4‐DB than from 2,4‐D. Dicamba gave a greater herbicide content than 2,4‐D when applied at high concentration at 20° C but not at 25° C, probably because of less injury at the lower temperature. Concentrations of Tween 20 up to 2% had no deleterious effect on the 2,4‐D content; on the other hand 2,4‐D content was lowered by 0–25% or more of cetyltrimethyl‐ammonium bromide. Poor wetting is not the cause of the variable herbicide contents sometimes obtained. Orthoarsenic acid, which has given better control of the weed than 2,4‐D, was very poorly translocated; its effectiveness is due to its high intrinsic toxicity. Etudes sur la teneur en herbicide des racines de Chondrilla juncea L. á la suite d'applications sur les feuilles