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A rhododendron showing the signs of severe damage by thrips. The silvering of the foliage occurs when the thrips, which are found on the undersides of the leaves, suck most of the sap from between the layers of the leaf. This damage is not reversible, but if treated the plant may be able to produce new foliage and recover. pests-and-diseases-3512htm'>Plant. Pests and Diseases