Noxious: Montana’s Battle With Spotted Knapweed, and What Birders Can Do
10,000 Birds
JULY 25, 2014
Thirteen different insects have been introduced into Montana in their turn as biological controls for knapweeds, from weevils that attack the roots to flies that lay eggs in the seed-heads. Since then, it has been pulled and plucked, sprayed and dusted, mowed and set on fire. And yet it persists. The impact of knapweed on Montana’s economy.
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