What biological control agents are approved for use in the US?
The Western Society for Weed Science has published an excellent book, “Biological Control of Weeds in the West,” which provides information on approved biological control agents, target species, availability, etc. You may be obtain this book from Western Society of Weed Science at P. O. Box 10342, Helena MT 59604. You may also obtain additional information from State Departments of Agriculture.
