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Yes, black flies can harm clematis even though the plant in question tends to be disease- and pest-resistant if heat, light, moisture and nutrient requirements are respected. The insects in question may be either aphids or fungus gnats. Many fungus gnats tend to affect root health whereas numerous aphids compromise foliage by piercing leaf, stalk and stem tissue, by removing nutrient-rich xylem and sugar-rich phloem from plant interiors, and by vectoring diseases and pathogens.

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Q: Will black flies harm clematis
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