Hi Sue, thanks for the question.

Looking closely at the pictures, the detail was not enough to establish a good identification.  Frequently the Korean Spicebush Viburnums showing severe leaf curling.  This is caused by aphids.  The white could be shed skins of the aphids.   Aphids can be squished on the leaf or treated with neem oil.  The second picture seemed to show a cocoon and a larva, both unidentifiable.  Were there other signs of symptoms like holes chewed in leaves, stippling, or discoloration in the leaves? Are the insects on the bottoms of the leaves, top or both?  Does the plant show any dieback? Other pests to consider are whitefly and thrips.  Check out these links:

https://hgic.clemson.edu/factsheet/viburnum-diseases-insect-pests/#:~:text=the%20one%20removed.-,Aphids,-Snowball%20aphids%20

What’s eating my viburnums and how can I stop it? - Gardening in Michigan (msu.edu)

Viburnum Pests (cornell.edu)

I hope this is helpful I look forward to your response.

Hi Sue,

Thanks for the additional pictures.  You definitely have aphids, most likely black bean aphids.  These are primarily the winged form that is probably moving on spreading to a secondary host.  They probably did the damage earlier when the buds were coming out.  Scout for them early in the season before the populations build.  A hard spray of water will dislodge them from the plants.    Neem oil sprays and insecticidal soaps will also work, pyrethrins will work when populations get higher.  Use of systemic pesticides can be harmful to bees.  Check out the following links:

Viburnum Pests (cornell.edu)

Aphids - Integrated Pest Management | UI Extension (uidaho.edu)

aphids-factsheet (cornell.edu)

I hope this is helpful.

Hi again,

Neem oil to be effective must be applied when the insects are present.  Any aphids that are present now can be treated but may take more than one application.  The label will tell you when you can retreat.  Also, look for infestations when buds are getting ready to open in the spring.