Influence of water stress on absorption, translocation and phytotoxicity of fenoxaprop-ethyl and imazamethabenz-methyl in Avena fatua

Summary The influence of water stress on the absorption and translocation of 14C-labelled fenoxapropethyl and imazamthabenz-methyl in Avena fatua L. (wild oat) was studied. The phytoioxicity to A. fatua of both herbicides with a droplet application was also examined under water stress conditions. The absorption of both fenoxaproethyl and imazamethabenz-methyl was reduced by waler stress when the plants were harvested within 24 h after herbicide application. Up to 48 h after the application, the translocation out of the treated lamina of both herbicides, based on percentage of applied 14C. was reduced under water stress conditions. When havested 96 h after herbicide application, however, water stress no longer significantly affeaed the absorption and translocation of either herbicide. When the herbicides were applied as individual droplets, water stress reduced the phytotoxicity of fenoxaprop-ethyl but not that of imazamethabenz-methyl. It is concluded that the changes in herbieide absorption and translocation may not be the major physiological processes associated with differential whole-plant response oi A faiua to fenoxaprop-ethyl and imazamefhabenz-methyl under water stress.

[1]  B. Caldwell,et al.  Spray Deposition of Fenoxaprop and Imazamethabenz on Wild Oat (Avena fatua) as Influenced by Environmental Factors , 1995, Weed Science.

[2]  F. Rossi,et al.  Alleviating the Antagonistic Effect of Moisture Stress on Smooth Crabgrass (Digitaria ischaemum) Control with Fenoxaprop , 1994, Weed Science.

[3]  A. I. Hsiao,et al.  Effect of drought and formulation on wild oat (Avena fatua) control with imazamethabenz and fenoxaprop , 1994 .

[4]  F. Rossi,et al.  Fate of Fenoxaprop-Ethyl Applied to Moisture-Stressed Smooth Crabgrass (Digitaria ischaemum) , 1993, Weed Science.

[5]  H. Xie,et al.  Influence of water deficit on the phytotoxicity of imazamethabenz and fenoxaprop among five wild oat populations , 1993 .

[6]  R. Boydston.  Drought Stress Reduces Fluazifop-P Activity on Green Foxtail (Setaria viridis) , 1992, Weed Science.

[7]  A. Smith,et al.  The influence of Agral 90 surfactant on the activity of imazamethabenz in wild oats (Avena fatua L.) , 1990 .

[8]  J. L. Griffin,et al.  Moisture Stress Effects on the Absorption, Translocation, and Metabolism of Haloxyfop in Johnsongrass (Sorghum halepense) and Large Crabgrass (Digitaria sanguinalis) , 1990, Weed Science.

[9]  D. Coupland.  Pre‐treatment environmental effects on the uptake, translocation, metabolism and performance of fluazifop‐butyl in Elymus repens , 1989 .

[10]  D. Reynolds,et al.  Moisture Stress Effects on Absorption and Translocation of Four Foliar-Applied Herbicides , 1988, Weed Technology.

[11]  J. D. Nalewaja,et al.  Uptake and Translocation of Fluazifop in Green Foxtail (Setaria viridis) , 1988, Weed Science.

[12]  D. Coupland.  Influence of environmental factors on the performance of sethoxydim against Elymus repens (L.) , 1987 .

[13]  J. Caseley,et al.  The influence of growth stage and foliage or soil application on the activity of AC 222,293 against Alopecurus myosuroides and Arena fatua , 1984 .

[14]  D. Penner,et al.  Absorption, Translocation, and Activity of Fluazifop-Butyl as Influenced by Plant Growth Stage and Environment , 1984, Weed Science.

[15]  I. N. Morrison,et al.  Effect of Moisture Stress on Wild Oat (Avena fatua) Response to Diclofop , 1983, Weed Science.