Tag Archives: willow species

Willow Stem Galls

This gallery contains 4 photos.

The second gall Leonard and I found on willows along the Lower Hat Creek Trail (Shasta County CA) is the willow stem gall. I discussed the willow rosette galls that infect leaf buds in my last post (“Willow Rosette Gall” … Continue reading

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Willow Rosette Gall

This gallery contains 4 photos.

Along the Lower Hat Creek Trail (Shasta County CA) is a cluster of willows heavily infected with two different gall forms. These galls appear along the length of approximately three-fourths of the stems. One form is a thick-walled, smooth, elongated, … Continue reading

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Willow Redgall Sawfly

This gallery contains 3 photos.

I believe that the willow gall pictured in my last post (Willow Galls) was induced by the willow redgall sawfly (Pontania viminalis). The identification of sawflies and their willow galls is confusing so I may be wrong about the species, … Continue reading

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Willow Galls

This gallery contains 3 photos.

Many different sawflies, midges, mites and a rust fungus induce galls on the stems and leaves of willow (Salix) species. In the same way that willows are taxonomically complex, the insects that produce these galls are difficult to identify. Much … Continue reading

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