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P&PDL Picture of the Week



Columbine Sawfly

Peggy Sellers and Cliff Sadof, Purdue University
(Photos by Steve Mayer, Marion County Cooperative Extension Service)

Columbine sawfly larvae can be found devouring leaves of columbines in late spring. These larvae are green with dark heads. They start feeding on the leaf edge and eat inward and devour all leaf tissue except the mid-veins. The resulting damage make plants look like they were sprouting match sticks, according to Joe Boggs from The University of Ohio's BYGL Newsletter (April 25, 2002).

After feeding for a few weeks in late spring, they drop from the plant and pupate. Adults then emerge within a few weeks. There is one generation per year in Indiana. Control is possible with insecticidal soap, spinosad (for more information on spinosad, see the May 2002, ACORN Newsletter), or pyrethroid insecticides.

Click on smaller image to view a larger imager.

Columbine Sawfly Larvae Feeding Columbine Sawfly Damage
Columbine Sawfly Larvae Feeding Columbine Sawfly Damaged Plant
Columbine Sawfly Larvae Close-up Columbine Sawfly Larvae
Close-up of Columbine Sawfly Larva Close-up of Columbine Sawfly Larva with Penny

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The Plant & Pest Diagnostic Laboratory at Purdue University