Premium
Aufnahme, Translokation und Phytotoxizität von Imazapyr und Glyphosat bei Imperata cylindrica (L.) Raeuschel: Wirkung der Herbizidkonzentration, der Lage des Applikationspunktes und zweier direkter Applikationsmethoden
Author(s) -
TOWNSON JANE K.,
BUTLER RUTH
Publication year - 1990
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.1365-3180.1990.tb01709.x
Subject(s) - imazapyr , glyphosate , imperata , phytotoxicity , chromosomal translocation , horticulture , chemistry , rhizome , botany , agronomy , biology , biochemistry , gene
Summary: The activity of imazapyr and glyphosate against Imperata cylindrica was studied in field and glasshouse experiments using two methods of direct contact application; a rope‐wick wiper and a cloth soaked in herbicide solution. The effect of concentration and position of application on herbicide uptake and translocation was also measured. At the lowest dose of imazapyr (5 mg acid equivalent (a.e.) per plant), phytotoxicity was greater from applications by a rope‐wick wiper than by a cloth. However, when the dose of imazapyr was increased, the cloth applicator was more effective than the rope‐wick wiper. At all doses of glyphosate, rope‐wick application was more effective than wiping with a cloth. Herbicide performance in the glasshouse was similar to that in the field. Radiotracer studies showed that increasing the concentration of imazapyr, while keeping herbicide dose constant, decreased uptake and translocation of radiolabel. In contrast, the rate of uptake of 14 C‐glyphosate increased with increasing herbicide concentration. Position of application did not significantly affect the amount of uptake and translocation of radiolabel to the rhizomes. It is concluded that rope‐wick wipers are more effective than wiping with a cloth for applying imazapyr and glyphosate to I. cylindrica , provided that the concentration of imazapyr does not exceed 10 g a.e. l −1 .