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Dear Ann, here's the response to your question:

Good evening Ann,

The most devastating problem of clematis is a fungal stem rot and leaf spot called clematis wilt. The two fungi credited with causing clematis wilt are Phoma clematidina and Ascochyta clematidina. With this disease, the plant or part of the vine suddenly collapses, and within a few days, the stem and leaves turn black and die. Cut off and destroy all the affected parts. Rake up and dispose of fallen foliage.

https://www.canr.msu.edu/hrt/uploads/534/79846/06-Growing-Clematis-English.pdf

https://www.missouribotanicalgarden.org/gardens-gardening/your-garden/help-for-the-home-gardener/advice-tips-resources/insects-pests-and-problems/diseases/cankers/clematis-wilt

https://hgic.clemson.edu/factsheet/clematis/

The photo shows some leafcutter bee, caterpillar, beetle or earwig feeding damage too.

https://yardandgarden.extension.iastate.edu/encyclopedia/leafcutter-bees

Good luck & have a great day!

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Carrie M

Michigan State University Extension

Master Gardener Volunteer

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