47+ Brown Spots On Rhododendron Leaves. Caused by late spring or early autumn frosts. It sounds to me like winter dehydration damage.
Rhododendron Problems What S Wrong With My Rhododendron Gardening From House To Home from cdn-aeipe.nitrocdn.com
Pest description and crop damage: Rhododendrons are best known for their spectacular clusters of large, showy and often fragrant flowers. Over the last few days about 25% of the leaves are showing the brown spots.
Generally, rhododendrons thrive in u.s.
It sounds to me like winter dehydration damage. Lacebugs can cause damage on rhododendrons. About a week ago a few leaves had some brown spots on them. But when you can see brown spots where the leaf tissue hasn't fallen away yet, you know that it's a fungal problem not an insect problem.
