Factors to consider when using native biological control organisms to manage exotic plants

Cofrancesco, Alfred F. (2000) Factors to consider when using native biological control organisms to manage exotic plants. Journal of Aquatic Plant Management, 38, pp. 117-120.

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Biological control of exotic plant populations with native organisms appears to be increasing, even though its success to date has been limited. Although many researchers and managers feel that native organisms are easier to use and present less risk to the environment this may not be true. Developing a successful management program with a native insect is dependent on a number of critical factors that need to be considered. Information is needed on the feeding preference of the agent, agent effectiveness, environmental regulation of the agent, unique requirements of the agent, population maintenance of the agent, and time to desired impact. By understanding these factors, researchers and managers can develop a detailed protocol for using the native biological control agent for a specific target plant. . We found E. lecontei in 14 waterbodies, most of which were in eastern Washington. Only one lake with weevils was located in western Washington. Weevils were associated with both Eurasian ( Myriophyllum spicatum L.) and northern watermilfoil ( M. sibiricum K.). Waterbodies with E. lecontei had significantly higher ( P < 0.05) pH (8.7 ± 0.2) (mean ± 2SE), specific conductance (0.3 ± 0.08 mS cm -1 ) and total alkalinity (132.4 ± 30.8 mg CaCO 3 L -1 ). We also found that weevil presence was related to surface water temperature and waterbody location ( = 24.3, P ≤ 0.001) and of all the models tested, this model provided the best fit (Hosmer- Lemeshow goodness-of-fit = 4.0, P = 0.9). Our results suggest that in Washington State E. lecontei occurs primarily in eastern Washington in waterbodies with pH ≥ 8.2 and specific conductance ≥ 0.2 mS cm -1 . Furthermore, weevil distribution appears to be correlated with waterbody location (eastern versus western Washington) and surface water temperature.

Item Type: Article
Title: Factors to consider when using native biological control organisms to manage exotic plants
Personal Creator/Author:
Cofrancesco, Alfred F.
Journal or Publication Title: Journal of Aquatic Plant Management
Volume: 38
Page Range: pp. 117-120
Date: 2000
Issuing Agency: Aquatic Plant Management Society, Inc.
Additional Information: July 2000 Special Issue: The Use of Native Insect Herbivores for the Management of Eurasian Watermilfoil
Uncontrolled Keywords: non-indigenous plants, insect, native, augmentative release
Subjects: Management
Item ID: 1963
Depositing User: Stephanie Haas
Date Deposited: 18 Mar 2009 22:16
Last Modified: 29 Sep 2011 19:52
URI: http://aquaticcommons.org/id/eprint/1963

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