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Absorption and translocation of triclopyr ester in Populus tremuloides

  • Jian Zhong Huang (a1), Robert A. Campbell, John A. Studens (a1) and Richard A. Fleming (a1)

The effect of three spray variables (droplet number, active ingredient concentration, and droplet size) on uptake and translocation of formulated 14C-triclopyr ester was studied in greenhouse-grown Populus tremuloides seedlings. The dose per plant in all treatments was held constant. In all experiments, absorption (as a percentage of dose applied) was much greater than translocation (as percentage of dose absorbed). Absorption and translocation decreased as concentration (ai) was increased and droplet number decreased. Absorption and translocation also decreased as droplet number decreased and droplet size increased. When concentration (ai) was increased and droplet size decreased, absorption again decreased but to a much lesser extent than in the other two experiments; there was no significant effect on translocation. A time-course experiment indicated that uptake rate began to decrease within 1.5 h of application. The rate of decrease was greater at the higher concentration (ai), suggesting that the decrease was associated with contact injury. A model to integrate the application parameters and translocation gave a high correlation between dose per unit droplet stain circumference and translocation.

Corresponding author
Corresponding author. Great Lakes Forestry Centre, Sault Ste. Marie, Ontario, Canada P6A 5M7;
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R. Behrens 1957. Influence of various components on the effectiveness of 2,4,5-T sprays. Weeds 5:183196.

M. Knoche 1994. Effect of droplet size and carrier volume on performance of foliage-applied herbicides. Crop Protect. 13:163178.

C. R. Merritt 1982. The influence of form of deposit on the phytotoxicity of MCPA, paraquat and glyphosate applied as individual drops. Ann. Appl. Biol. 101:527532.

H. H. Smith 1946. Quantitative aspects of aqueous-spray applications of 2,4-dichlorophenoxyacetic acid for herbicidal purposes. Bot. Gaz. 107:544551.

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Weed Science
  • ISSN: 0043-1745
  • EISSN: 1550-2759
  • URL: /core/journals/weed-science
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