The Purdue Plant and Pest Diagnostic Laboratory

P&PDL Picture of the Week for
May 16, 2005

European Pine Sawfly

Cliff Sadof, Extension Ornamental Entomology Specialist, Purdue University

Now would be a good time to inspect mugho pines for what appears to be stray straw near the shoot tip. Close examination of the shoot could reveal the black heads of European pine sawflies. These grow to an inch in legnth and will defoliate mugho and other pines. Fortunately these sawflies are easily killed by an application of spinosad (Fertilome borer and bagworm killer), or 2% horticultural oil.

Defoliation by European Pine Sawfly, Neodiprion sertifer

European Pine Sawflies Damage

Defoliation by Pine Sawflies

Pupal cases of European Pine Sawfly

 

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Adult European Pine Sawfly

First Instar European Pine Sawflies

European Pine Sawfly

 

Purdue Plant & Pest Diagnostic Lab Purdue Cooperative Extension Service