What's eating my lythrum salicaria?

Purple loosestrife faces feeding damage from aphids, chrysomelid beetles, and caterpillars in garden settings. Deer and rabbits occasionally browse young stems. The plant is vigorous and tolerates most pest pressure well, but heavy aphid infestations on new growth are the most common problem gardeners report.

Colonies cluster on new shoot tips and flower buds, causing distorted, sticky growth with honeydew and sooty mold. Blast off with a strong jet of water; introduce ladybugs or lacewings; apply insecticidal soap spray if colonies persist.

Adults and larvae skeletonize leaves, leaving ragged brown patches; heavy feeding can defoliate stems. Used deliberately as biocontrol in North America. In garden settings tolerate light damage; hand-pick beetles and larvae; avoid pesticides if beneficial biocontrol populations are present in your region.

Irregular holes chewed in leaves; frass visible on foliage. Typically localized and not severe. Hand-pick caterpillars; apply Bacillus thuringiensis (Bt) spray to affected stems for larger infestations.

Ragged holes in lower leaves and young stems near soil level, especially in damp marginal or pond-edge plantings. Apply iron phosphate slug pellets around the base; use copper tape on containers; set beer traps nearby.