Cottony Cushion Scale in UP?

Question: Do we have Cottony Cushion Scale here in the UP?  I've been told by 2 people (who just viewed photos that I e-mailed to them) that that's what I had on my Nannyberry viburnum last summer.  But elsewhere I read that it's not really found where temperatures get below 10 degrees in winter...  If we do have this particular scale insect around here, can you tell me if either of the biological controls Rodolia cardinalis or Cryptochaetum iceryae work to control it here? I’d greatly appreciate any advice!

responder: An Ask Extension Expert Replied March 27, 2023, 5:54 PM EDT
response: Hello,  I could not find where Cottony Cushion Scale was found in the UP. I have seen information on other states.  Like California - See the Biological Control section from this Pest Note - Cottony Cushion Scale - Integrated Pest Management for Home Gardeners and Landscape Professionals - University of California at this link: https://ipm.ucanr.edu/legacy_assets/pdf/pestnotes/pncottonycushionscale.pdf  This may be another type of scale - I recommend you get a confirmed diagnosis from the MSU Diagnostic Plant Lab. Please email your digital image prior to bringing or sending physical samples. Images can be sent to <personal data hidden>.   MAKE SURE IN THAT E-MAIL YOU INCLUDE YOUR NAME, ADDRESS, AND PHONE NUMBER!!  They should be able to make a diagnosis of your problem without seeing a sample. Be prepared. The lab may ask for more images - THE LAB WILL LET YOU KNOW IF A SAMPLE NEEDS TO BE SENT - There is a $20-25 dollar fee (if they need a sample sent).  Lab email: <personal data hidden> Lab phone:<personal data hidden> Hours of operation: Monday through Friday, from 8:00 AM to 5:00 PM.  PLEASE READ BELOW ON PREPARING YOUR SAMPLE (if the lab needs a sample)  From the lab: Please do not ship samples on Fridays. Due to the current COVID-19 circumstances, please allow additional processing time. They thank you for your patience and understanding.  A completed submission form must accompany every sample. Please place the form in a separate resealable bag to prevent it from getting damp or soiled. The form is at this link: https://www.canr.msu.edu/pestid/uploads/files/General_Sample_Submission_Form_May2022.pdf  Complete details of submitting a sample are at this link: https://www.canr.msu.edu/pestid/submit-samples/

responder: An Ask Extension Expert Replied March 28, 2023, 4:45 AM EDT
response: Hello,  Here is another possibility - treehopper egg masses on redbud. These egg masses can also be found on the viburnum. Please see the information at this link: https://web.extension.illinois.edu/hortanswers/detailProblem.cfm?PathogenID=90   The white egg masses can be gently scraped off if you would like to do so. But they usually don't harm the shrub, as the article states. Please see the article at this link: https://bygl.osu.edu/node/566

responder: The Question Asker Replied March 28, 2023, 7:42 AM EDT
response: Thank you! If it's this instead, that may explain why I didn't ever see any ants anywhere? I was told to keep ants of the tree by putting something sticky around the base of the trunk, but I didn't bother since there weren't any ants to be found.   On Tuesday, March 28, 2023, 04:45:24 AM EDT, Ask Extension <<personal data hidden>> wrote:

responder: An Ask Extension Expert Replied March 28, 2023, 7:47 AM EDT
response: You are welcome!! Have a great day!!