There are several pests and pathogens that can cause trouble on holly bushes. Examine the leaves and branches carefully to see if you can identify a problem. This article explains the most likely culprits: https://www.gardeningknowhow.com/ornamental/shrubs/holly/diseases-of-holly-bushes-pests-and-diseases-damaging-holly-bushes.htm
Answered on April 7, 2014
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