Managing Fungal Leaf Spot on Butterfly Bush

Identifying and Treating Leaf Spot on Buddleia

Cool, wet springs often trigger fungal leaf spot on butterfly bush (Buddleia). The disease appears as rust-colored spots and curled leaves. While unsightly, it is rarely fatal.

Cultural Controls

• Remove and dispose of affected leaves (bag or burn).
• Rake up all fallen leaves in autumn to reduce overwintering spores.
• Water at the base of the plant, avoiding overhead irrigation.
• Avoid fertilizing, as tender new growth is more susceptible.

Chemical Options

Fungicidal sprays (chemical or organic) are available at garden centers. Apply early in the season—when buds have formed but not yet opened—for best results. Always follow label instructions.