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Volume |
39 |
Page |
20 |
Title |
Evaluation of selected herbicides for the control of exotic submerged weeds in New Zealand:I. The use of endothall, triclopyr and dichlobenil. |
Author(s) |
D.E. Hofstra and J.S. Clayton |
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| Keywords | Lagarosiphon major, Ceratophyllum demersum, Egeria densa, Hydrilla verticillata, Potamogeton, Myriophyllum, Chara, Nitella, chemical control. |
| Abstract | The aquatic herbicide diquat is the only product registered in New Zealand for controlling the submerged weeds Lagarosiphon major, Ceratophyllum demersum, Egeria densa, and Hydrilla verticillata. However, diquat can be ineffective under some environmental conditions and it does not control certain submerged weeds. Trials were conducted to evaluate the potential of the herbicides, endothall, triclopyr and dichlobenil to control the aforementioned target weeds and to evaluate impacts on non-target native species of Potamogeton, Myriophyllum, Chara and Nitella when using these products. Endothall killed C. demersum, L. major, H. verticillata and some species of Myriophyllum and Potamogeton but not E. densa or species of Chara or Nitella. Only transient growth effects were observed in target plants treated with triclopyr and dichlobenil. |