NDSU Extension - Morton County

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July 7, 2020 Yellowheaded Spruce Sawfly

NEWS

For Immediate Release

July 8, 2020

 

Yellowheaded Spruce Sawfly

Yellowheaded Spruce Sawfly larvae is active right now on spruce trees.  Larvae is greenish with darker green stripes down the side. The heads of the larvae are orangish-brown color. The color of the larvae will darken as it matures.

If you are noticing defoliation or browning of the tips of needles, do some further inspection to see if you can see the larvae on the branches.  Larvae will feed 30-40 days, typically eating new needles first, but will go after older needles as well.  They work their way from the tips of the branches inwards.

If you have a small infestation, hand removal or a jet stream of water is recommended.  Yellowhead Spruce Sawfly tend to attack the same tree repeatedly warranting chemical control.  If this is the case or you have a large infestation you can use carbaryl or acephate.  Make sure to follow the label accordingly.

For more information, contact:

Kelsey Deckert, Extension Agent - Horticulture
Burleigh/Morton County Extension (701) 221-6865 or (701) 667-3340

 

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