Yellow Headed Spruce Sawfly and Gypsy Moth Hiding & Feasting

In the north Toronto area, there is quite a problem with yellow headed spruce sawfly.  I blogged about their hatch last week and already they have grown to 10-15 mm long!

Take a quick scan of the new growth on spruce, especially Colorado spruce (Picea pungens).  Look for straw-like needs that are withering….and the disappearance of needles all together.  This is very typical damage of YHSS.

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And here is the little beast, the yellow headed spruce sawfly larva.  They really blend in to the foliage and they are easy to miss.

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Hopefully these photos of injury make their detection a little easier for you 🙂

And look what else we found lurking on an English oak…..little shadows on leaves when we looked up into the canopy.

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We flipped over some leaves and there they were hiding…..

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And several were hiding on the main trunk, taking their afternoon Siesta….

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One Response to Yellow Headed Spruce Sawfly and Gypsy Moth Hiding & Feasting

  1. I just love the photos with the information! It helps so much.

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