Comparison of imazapyr and imazamox for control of parrotfeather (Myriophyllum aquaticum (Vell.) Verdc.)

  • Published source details Wersal R.M. & Madsen J.D. (2007) Comparison of imazapyr and imazamox for control of parrotfeather (Myriophyllum aquaticum (Vell.) Verdc.). Journal of Aquatic Plant Management, 45, 132-136.


This study is summarised as evidence for the following.

Action Category

Parrot’s feather: Use of herbicides - other herbicides

Action Link
Control of Freshwater Invasive Species
  1. Parrot’s feather: Use of herbicides - other herbicides

    A small, replicated, randomized, controlled, laboratory study conducted in 2006 in the USA (Wersal & Madsen 2007) found that the application of the herbicide imazapyr reduced growth in parrot’s feather Myriophyllum aquaticum. After ten weeks, the biomass of parrot’s feather plants treated with imazapyr at rates of 584 and 1,123 g/ha was reduced to 0 g/pot whereas untreated plants had a biomass of 140 g/pot. The biomass of plants treated with imazapyr at a rate of 281 g/ha (160 g/pot) did not differ significantly from untreated plants (140 g/pot). Parrot’s feather shoots were propagated in 3.8 l plastic containers. Each herbicide rate (281, 584 and 1123 g/ha) was applied to three plants and three plants were left untreated.

    (Summarised by: Ricardo Rocha)

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