Don\u0027t be fooled by the attractive appearance of leafy spurge, it is a noxious weed introduced to North America from Europe and Asia.
The plant is very noticeable when blooming and should be reported to the local authority responsible for weed control. Small patches may be removed by spraying with herbicide but, in the case of the patch growing by the river, a biocontrol agent would be more appropriate.
Populations of the caterpillar have been noticed in Saskatchewan in other years, occasionally in high numbers, unlike the single caterpillar I observed on my walk. This year a large infestation was seen in southern Saskatchewan in the Meyronne area, where thousands of caterpillars defoliated the spurge .
Recently, an article in the agricultural newspaper The Western Producer , described attempts to increase the populations of the beetles by catching adults in an area with a well-established population, and releasing them in other areas where leafy spurge grows. Volunteers catch enough beetles, in sweep nets, to start a new population in another area infested with leafy spurge. The beetles only feed on leafy spurge, so other plants are not damaged.
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