Knowledgebase
Crane Fly White Grubs #743467
Asked April 09, 2021, 2:27 PM EDT
Multnomah County Oregon
Expert Response
Henry: Can you describe (or even better, send me a picture) of the grubs you are seeing? One potential target may shortly pupate and then not be affected by treatments. Others are still vulnerable. I am concerned if there is a dog out there during treatment, it could be a problem for the dog. But first, let's make sure this is the right time to treat and that starts with an accurate identification of the lawn pest. Here is my email: <personal data hidden>. Chip Bubl
OSU Extension Agent/Columbia County
<personal data hidden> cell
Thank you for your response. I am attaching photos of the grubs we have in our lawn. The grub in the photos appears to have a greenish color, but we often see them look light gray. The length is about 1.5 inches. Is this the type of grub we should treat this time of year, and if so, with what? We can keep the dog out of the back yard during and for some time after treatment. Do you know how long we should wait before giving the dog backyard access?
Sent: Friday, April 9, 2021 12:58 PM
To: Henry Griffith <<personal data hidden>>
Subject: Re: Crane Fly White Grubs (#0013398)
Your photo appears to be a crane fly. Their numbers are higher this year. Treatment, if you choose to do it, would involve a granular insecticide for lawns. Read the label carefully for precautions. I would err on the side of safety re not letting the dog back on the grass for at least 48 hours if not longer. The need to treat depends on the number of the larva. They are just about done feeding and control drops off. An OSU recommendation has been that if there are not 25 per square foot, treatment isn't necessary and that proper fertilizing and watering will suffice to avoid serious damage. If you want visit more about this, call me on my cell at<personal data hidden>. Chip
