Roya: Yellow spots in late summer or early fall.
Powdery mildew: Flowers and leaves covered with a whitish coating.
Negron: black scabs on the leaves that cause his downfall.
Aphid: Aphids that are placed on the leaves, shoots and buds.
Treatment of these conditions: Cut the parties concerned and apply insecticide (Consult the appropriate insecticide at a florist).
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