None are moving at the moment. I have them on 7 or 8 quince. Don’t seem interested in much else. Thanks for postingDo they fly?
White fly park their wings in a distinct fashion that looks like a delta-wing aircraft. There are, of course, other critters that are white.View attachment 282425
If they look like this, you have a problem.
They're not moving because they have full stomachs. A little naptime and they'll be off to other plants. They like variety in their diets!View attachment 282426View attachment 282427
They can look thinner too....wings more compact.
The OP's pic appears to show some of each look.
I could be wrong, just a guess.
Weird that none are moving...
Yes, "better living through chemistry". If you're an organic freak you can use a spray of 70% isopropyl alcohol straight out of the bottle works well as does spraying a Dawn liquid solution of 10% Dawn to 90% water. Stir, don't shake. Rinse the tree with clear water after an hour or so, then spray 1% Pyola and leave it for any errant eggs. My personal triple whammy. Bugs fear me.Regardless, whitefly or an adelgid, member of the mealy bug family, needs to be sprayed. My preference is "better living through modern Chemistry" - use a chemical pesticide, that lists whitefly and adelgids or mealy bug on the label. A pyrethrum spray likely will list both, as will some of the Spinosad compounds. Both chemicals have OMRI listed options (organic) if that is a "thing" for you. Requires at least one or two follow up applications to make sure the infestation is gone. Can be 100% effective.
You can try insecticidal soap sprays, repeated spraying with a soapy solution will more or less mechanically blast them away. A couple drops of dish soap in a pint or quart of water used as a spray. Requires repeat application, at 2 or 3 day intervals, and rarely is absolutely effective, but gives "pretty good" control.
You must do something, low tech, or high tech, but don't let this infestation spread. What ever course of treatment you need to apply the same to any other plants sharing the same room, space or growing area as this one.