Canadian Forest Service Publications
Efficacy of glyphosate on Populus tremuloides as affected by droplet size and spray volume. 1996. Liu, S.H.; Campbell, R.A. New Zealand Journal of Forestry Science 26:276-287.
Issued by: Great Lakes Forestry Centre
Catalog ID: 35224
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A low volume laboratory research spray ssystem and the spinning disk atomisers Flak, Herbi, and micromax were used to study the effect of droplet size and spray volume on glyphosate efficacy on trembling aspen (Populus tremuloides Michx). Five droplet sizes, each with a narrow droplet spectrum, ranging from 177 to 1589 µ VMD were used. Spray volumes from 15 to 120 /ha were tested. The phytotoxicity of glyphosate increased as carrier volume was reduced (thereby increasing herbicide concentration), but was not affected by changes in droplet size. There was no significant interaction between droplet size, spray volume, and active ingredient (a.i.) rate per hectare. It is possible that the concentration gradient between the droplet and leaf, rather than the droplet coverage, is important for glyphosate phytotoxicity.