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Influence of Droplet Size and Density on Phytotoxicity of Three Herbicides

Published online by Cambridge University Press:  12 June 2017

Raj Prasad  and
Beresford L. Cadogan
Raj Prasad
Affiliation:
506 Burnside Rd., Victoria, BC and For. Pest Manage. Inst., P.O. Box 490, Sault Ste. Marie, ON
Beresford L. Cadogan
Affiliation:
506 Burnside Rd., Victoria, BC and For. Pest Manage. Inst., P.O. Box 490, Sault Ste. Marie, ON
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Abstract

The effects of droplet size and numerical deposit density on herbicide efficacy differed among investigations that relied on commercial nozzles to produce droplets strictly within small, medium, or large sizes. A droplet generator capable of producing uniform and homogeneous droplets was therefore used in a greenhouse experiment. Four droplet size classes (150, 350, 450, and 650 μm) using glyphosate, hexazinone, and triclopyr on red alder, aspen, and white birch were studied. Herbicides applied in small (150 to 450-μm) droplets were more phytotoxic than large (660-μm) ones because of their greater numerical coverage and translocation. Leaf age, weed species, herbicide type, and mixture of droplet sizes were not critical in modifying the effects of droplet behavior; however, the concentrations of herbicide used had a positive effect. When the herbicides were applied at high concentrations, the influence of droplet size was nullified. These findings may help reduce the cost of application and the chemical burden in a forest environment.

Keywords

Glyphosate, N-(phosphonomethyl)glycinehexazinone, 3-cyclohexyl-6-(dimethylamino)-1-methyl-1,3,5-triazine-2,4(1H,3H)dionetriclopyr, [(3,5,6-trichloro-2-pyridinyl)oxy]acetic acidaspen, Populus tremuloides Michx. ♯ POPTMred alder, Alnus rubra Bong. ♯ ALURBwhite birch, Betula papyrifera Marsh. ♯ BETPYGlyphosatehexazinonetriclopyrAlnus rubraBetula papyriferaPicea glaucaPopulus tremuloidesALURBBETPYPIEGAPOPTM
Type
Research
Information
Weed Technology , Volume 6 , Issue 2 , June 1992 , pp. 415 - 423
Copyright
Copyright © 1990 by the Weed Science Society of America 

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References

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