Boxwood, Common
Symptom Cause  
Leaves pale; leaf lesions; twig die-back
Bacterial Canker
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Leaves pale; leaf lesions; twig die-back
Blight (bacterial)
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Leaves stippled, yellowing or bronze; dry out and drop may be webbing visible; sometimes galls form on leaves
Boxwood Mites
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Holes in leaves
Caterpillars
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Major damage to foliage
Deer
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Foliage looks burned
Dog Urine
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Tip of leaves brown, internal larvae trails visible. Leaves skeletonized/rolled up.
Leaf Miners
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Cottony white masses on roots, stems, branches leaves; reduced plant vigor
Mealybug
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Plant stunted, leaves yellow, root lesions
Root Nematodes
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Foliage dieback
Root Rot (fungus)
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Leaves and branches encrusted with small bumps; stunted plant growth
Scale
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Foliage dieback
Stem Rot
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