Publication Summary

Title

Aquatic Plants Technical Assistance Program, 2002 Activity Report

Month-Year PublishedSeptember 2003
Online Availability
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Short Description

This report contains maps and information on the known distribution of noxious aquatic weeds in Washington State. It also contains a list of all waterbodies with detailed aquatic plant data.

In addition, an update on research projects conducted in 2002 is provided. These consisted of: investigating the effects of the contact herbicide endothall on the aquatic plant community of Kress Lake (Cowlitz County), studying the impacts of a whole lake fluridone treatment on Egeria densa (Brazilian elodea) and Myriophyllum spicatum (Eurasian watermilfoil) in Loomis Lake (Pacific County), and a project studying biological control agents for M. spicatum.

(Also see abstract below)
Publication Number03-03-033
Author(s)Parsons, J.
Print Availability
Request from the program.
Number of pages 35 pp. + app (88 total)
Keywords aquatic, aquatic plants, county, creek, Eurasian watermilfoil, grant, Grays Harbor , Grays Harbor County, lake, money, Pacific County, plan, river, study, technical, technical assistance, water
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Abstract Long Description

The objectives of the Aquatic Plant Technical Assistance Program are to:

  • Provide technical assistance to government agencies and the public.
  • Document aquatic plant distribution throughout Washington State.
  • Assist with evaluating projects supported by Freshwater Aquatic Weed Program grant money.
  • Conduct research projects as opportunities arise.

    During the 2002 field season, aquatic plant data were gathered at 70 waterbodies throughout the state. Several previously unknown populations of non-native invasive aquatic plants were identified:

  • The first known wild population of Hydrocharis morsus-ranae (European frog-bit) west of Michigan was identified by county personnel in Meadow Lake, Snohomish County.
  • Myriophyllum spicatum (Eurasian watermilfoil) was found for the first time in Rotary Lake, Buena Lake, Pond 2, Pond 3, Pond 4, and Pond 5 near I-82 in Yakima County; and Red Rock Lake in Grant County. Also, new populations of M. spicatum were reported and confirmed in Connor Creek, Grays Harbor County; Horseshoe Lake, Pend Oreille County; McDowell Lake, Stevens County; and Newman Lake, Spokane County.
  • New populations of Myriophyllum aquaticum (parrotfeather) were found in some ponds and channels adjacent to the Yakima River near Wapato, and also near the mouth of Cloquallum Creek in the Chehalis River, Grays Harbor County.

    In addition to routine aquatic plant monitoring, we conducted several research projects. We continued monitoring effects of the contact herbicide endothall on the aquatic plant community of Kress Lake in Cowlitz County. We began a project studying the impacts of a whole lake fluridone treatment on Egeria densa (Brazilian elodea), M. spicatum, and the native plants in Loomis Lake, Pacific County. We also initiated a project to study biological control agents for M. spicatum.

    Other accomplishments include gathering plants for the herbarium collection, providing technical outreach, and assisting with projects funded by Freshwater Aquatic Weed Program grant money.


  • This page last updated October 8, 2008