Utah Sweetvetch: Hedysarum boreale
Seed Production Pests
Utah sweet vetch is a nitrogen fixing legume that grows on western rangelands. There is significant seed production in CO, UT and ID. 'Timp' is a released variety and several ecotypes are in production. A widespread seed weevil, Acanthoscelides sp has reduced yield by 75% in extreme situations. Lygus bugs can reduce seed set. The larvae of several native butterflies and moths can feed on foliage and seed pods, although we have not yet seen significant damage from them. Sweetvetch production is also impacted by a rust disease and root rot disease which are poorly understood.
Hebo plant

Hebo Seed Weevil

The Hedysarum seed weevil, Acanthoscelides sp., can be a major production issue for Utah Sweet Vetch seed where ever it is grown. Losses of 75% have been recorded. Little is known of the field biology of this insect, which maybe an undescribed species.

Hebo weevil


Lygus bugs can be major pest of many forbs including Hedysarum grown for seed. Lygus are generalists who feed on many species of plants. Their mobility makes them especially difficult to control.


Melissa's Blue Butterfly

Melissa's blue, Plejubus melissa, is wide spread across the western U.S. Larvae feed on many legume species. While often present in large numbers significant impacts on seed productions have not been recorded.

Melissa's Blue


The Hedysarum leafminer is virtually and unknown insect. We have seen damage, but have not reared the insect for identification yet. You can help. If you see active mines please let us know right away.

Leafminer Damage

This page was updated on April 26, 2014