Absorption and translocation of triclopyr ester inPopulus tremuloides

Abstract

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.

Journal of Plant Protection Research

“…(Aliverdi and Karami 2020). This is also true for other groups (mode of actions) of herbicides against easy-to-wet species (Knoche 1994;Huang et al 2000;Shaw et al 2000;Sasaki et al 2013;Creech et al 2015;Meyer et al 2016). Due to a low level of energy existing in smaller spray droplets, they can easily be deposited on the leaf surface, leading to greater efficacy of the herbicide (Penner 2000).…”

Effect of dose and adjuvant on uptake of triclopyr and dicamba into Pinus contorta needles

“…While concentration is expected to have an important influence on foliar uptake, its effect on uptake of many agrochemicals is largely unknown (Wang & Liu, 2007 ). Furthermore, its effect on uptake can be dependent on droplet size and number (Huang, Campbell, Studens, & Fleming, 2000 ), an aspect which was not examined in this study. This study indicated that for triclopyr applied as an ester to P. contorta needles, uptake generally decreased with increasing concentration, particularly above 3%.…”

“…In a study that examined absorption and translocation of triclopyr ester in Populus tremuloides , Huang et al. ( 2000 ) found that absorption and translocation of triclopyr decreased as concentration increased and droplet size decreased. Absorption and translocation also decreased as droplet number decreased and droplet size increased (while concentration was held constant).…”

Distribution, characterization and chemical management of noxious shrub weed (Dichapetalum stuhlmannii Engl) in cashew in southeastern Tanzania

“…Triclopyr work through selectivity of woody and herbaceous broadleaf plants, systemic movement and Auxin mimicking [ 53 , 65 ]. High accumulation and activity of Auxin (IAA) during the tender growth stage influences the potential efficacy of triclopyr through mimicking auxin hormone [ 63 , 66 , 67 ]. Nevertheless, less accumulation and activity of IAA during mature and blooming stages, reduces efficient performance of triclopyr [ 47 , 68 ].…”