What's eating my monarda cambridge scarlet?

Monarda Cambridge Scarlet is most often damaged by powdery mildew and four-lined plant bugs, which are the two defining problems for all Monarda cultivars. Aphids and slugs also attack in spring. Rabbits and deer will browse stems, though the aromatic foliage makes this less common than with non-scented perennials.

Circular, sunken brown or translucent spots on upper leaf surfaces; young nymphs are bright red-orange; damage looks like leaf spot disease Remove nymphs and adults by hand (they drop when disturbed — hold a bag underneath). Spray with insecticidal soap or neem oil in late spring when nymphs first appear. Cut back stems after flowering to remove eggs.

Dense colonies on soft stem tips and flower buds; honeydew fosters sooty mould; weakens flowering shoots Spray with a strong water jet or insecticidal soap. Encourage ladybirds and lacewings. Avoid excessive nitrogen that promotes lush growth aphids favour.

Ragged holes in young emerging stems and foliage at ground level in spring, especially in wet conditions Apply iron phosphate pellets around crowns in spring. Use gritty mulch as a physical deterrent. Hand-pick at night after rainfall.