Bug swarms in Missoula warn of winter weather switch

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Leafcurl aphids fill up the crevasses of the bark on a green ash tree on Tuesday evening. The aphids lay eggs in the bark, and in spring the new aphids hatch to feed on the leaves of the tree.

A leafcurl aphid rests on the leaf of a green ash tree. Young aphids can cause leaves to curl up as they feed in the spring.

Rob Chaney

Those little blue bugs that filled the Missoula air like snow all September will soon get replaced by real October snow.

This fall produced a particularly big swarm of leafcurl aphids in neighborhoods with green ash trees, according to Missoula County Extension Service horticulturalist Sandy Perrin.

The millimeter-long bits of blue fluff have flustered a lot of evening deck parties, but

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