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Why Holly Berries Stay Green: Gall Midge Infestation

If your holly berries remain green instead of turning red, the likely culprit is the holly berry midge, a tiny fly whose larvae feed inside developing berries, preventing ripening.

For detailed identification and control, see this resource.

Seeding and Propagation: Troubleshooting Brown, Drying Leaves on Yellow Holly Bushes; Photinia (Red Tip) Entomosporium Leaf Spot: Severe Disease Management; Why Oregon Grape Holly Berries Shrivel and Drop; Identifying "Red Apollo" Rose: Likely a Renamed Variety; Planting Root-Bound Steed Holly in Clay Soil; Homemade Fertilizer for Red Raspberries: Compost and Liquid Feeds; Flowering Almond Bush with Red Berries: Prunus japonica; Reviving a Declining Female Holly Bush: Water, Fertilizer, and Diagnostic Steps; Asparagus Fern Berries: Toxicity Risk for Children and Pets; Red Beauty® Holly: Abundant Red Berries with Dense Green Foliage

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