What's eating my scarlet bee balm?

Scarlet Bee Balm (Monarda didyma) is especially prone to powdery mildew in warm, humid summers — this is its number-one enemy. Aphids, spider mites, and stalk borers also occur. Deer and rabbits may browse young shoots despite aromatic foliage. Choosing mildew-resistant cultivars and ensuring good airflow are the most effective preventive steps.

White, talcum-like coating across leaf surfaces from midsummer; leaves yellow and shrivel; stems weaken and plant looks exhausted by August. Grow resistant cultivars ('Jacob Cline', 'Raspberry Wine'); space plants generously; apply potassium bicarbonate or neem oil spray at first signs.

Distorted, sticky growing tips; colonies of small insects on stems and flower buds; honeydew promotes sooty mould and ant activity. Blast off with water; apply insecticidal soap spray; encourage ladybirds, lacewings, and hoverflies as natural controls.

Fine pale speckling on leaf upper surfaces; undersides show tiny mites and fine webbing during hot, dry spells. Increase humidity by misting foliage; spray forcefully with water; apply neem oil or predatory mite sachets for heavy infestations.

One or more stems wilt and die while surrounding stems stay healthy; hollow pith with caterpillar and frass inside. Cut and destroy wilting stems immediately; keep surroundings clear of tall weeds that harbour eggs; no spray is effective once inside.