Foliar penetration and dissipation of triclopyr butoxyethyl ester herbicide on leaves and glass slides in the light and dark
1991
Bentson, K.P. | Norris, L.A.
The disposition of triclopyr BEE [butoxyethyl ester of [(3,5,6-trichloro-2-pyridinyl)oxy]acetic acid] from spray mix droplets on excised Pacific madrone (Arbutus menziesii Pursh.) and giant chinkapin [Castanopsis chrysophylla (Dougl.) A. DC.] leaves and glass microscope slides was determined in a factorial laboratory experiment. Factors were temperature (10, 25, and 40 degrees C), illumination (light or dark), and time (from 0 to about 4100 min in 820-min increments). Triclopyr BEE penetration into chinkapin leaves is greater than into madrone leaves at all temperatures. Foliar penetration into madrone leaves did not increase between 25 and 40 degrees C. Losses in the dark were greatest from glass slides and least from chinkapin. Triclopyr BEE loss from chinkapin leaves at 40 degrees C in the light was equivalent to loss in the dark at 40 degrees C. Losses of triclopyr BEE from both glass slides and madrone leaves were greater in the light treatments. Models were developed by using mass balance coefficients. Results from outdoor exposures fell within 95 % confidence intervals of model predictions of triclopyr BEE fate.
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