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Susceptibility of Eurasian Watermilfoil ( Myriophyllum spicatum ) and a Milfoil Hybrid ( M . spicatum × M . sibiricum ) to Triclopyr and 2 , 4-D Amine
| Content Provider | Semantic Scholar |
|---|---|
| Author | Poovey, Angela G. Slade, Jeremy G. Netherland, Michael D. |
| Copyright Year | 2007 |
| Abstract | Hybridization of the exotic Eurasian watermilfoil ( Myriophyllum spicatum L.) with the native northern watermilfoil ( M. sibiricum Komarov) has been verified in the Great Lake and Pacific Northwest regions. To determine if a milfoil hybrid was susceptible to aquatic herbicides typically used to control Eurasian watermilfoil, we conducted a small-scale experiment evaluating the comparative response of M. spicatum × M. sibiricum and its parental species, M. spicatum , to 2,4-D (2,4-dichlorophenoxyacetic acid) and triclopyr (3,5,6-trichloro-2-pyridinyloxyacetic acid). Plants were field collected from Minnesota, grown in 48-L aquaria, then dosed with 0.01, 0.03, 0.09, 0.27, 0.81, 2.43 acid equivalent (ae) 2,4-D amine and triclopyr for an exposure time of 24 to 28 h. The dose that caused a 50% growth reduction (GR 50 ) in shoot length was calculated from dose-response curves for each herbicide. For triclopyr, the GR 50 (±1 SE) for Eurasian watermilfoil was 0.04 ± 0.01 mg ae L -1 , while the GR 50 for the milfoil hybrid was 0.08 ± 0.01 mg ae L -1 . For 2,4-D amine, the GR 50 for the Eurasian genotype was 0.11 ±0.02 mg ae L -1 while the GR 50 for the hybrid was 0.12 ± 0.02 mg ae L -1 . Rates of ≥ 0.27 mg ae L -1 triclopyr or 2,4-D amine were effective in reducing shoot biomass by 95 to 100% for both the Eurasian and hybrid milfoils. This initial study showed that Eurasian watermilfoil and the milfoil hybrid responded similarly to the herbicides tested. Additional testing of different milfoil hybrid accessions should be conducted to determine the roles genotypic variation, environmental factors, and plant vigor may play in the operational chemical control of milfoil species. |
| File Format | PDF HTM / HTML |
| Alternate Webpage(s) | http://www.apms.org/wp/wp-content/uploads/2007/12/v45p111.pdf |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
