News and Reviews

Economic Impact of Weed Biological Control

Is weed biocontrol really worth attempting? A recent study focused on the potential economic benefits of biocontrol of leafy spurge, a perennial weed native to Europe and Asia, that has become a serious problem for ranchers and land managers in the northern Great Plains. Biological agents are predicted to control about 65% of the leafy spurge infestation on about 1.2 million acres in the four-state region of Montana, North Dakota, South Dakota and Wyoming by the year 2025. Direct economic impacts are estimated to total about $19.1 million annually, and secondary impacts at $39.3 million, for a total annual economic impact of $58.4 million.


Bangsund, D. A., F. L. Leistritz, and J. A. Leitch. 1999. Assessing economic impacts of biological control of weeds: The case of leafy spurge in the northern Great Plains of the United States. J. Envir. Manag. 56(1):35-43.

Parasitoid Fly Newsletter

The Tachinid Times is an annual newsletter about research on parasitic flies of the family Tachinidae. This newsletter acts as a forum for informal communication about current projects, recent research findings, field trips, and similar types of information relating to the Tachinidae. The emphasis is on news and research notes that would not ordinarily be published elsewhere. Most of the information is highly technical, but some articles would be of interest to the general practitioner. Unfortunately there is no way to search the site for specific information.

The last several issues of the Tachinid Times are accessible on the Internet. Current issues go online shortly after distribution of hardcopies each February. To subscribe or contribute to the newsletter, contact the editor, Jim O'Hara.

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