What's eating my swamp rose mallow?

Swamp rose mallow faces Japanese beetles, aphids, and whitefly as its main threats. Japanese beetles skeletonize petals and leaves in summer. Aphids cluster on new growth and buds. Handpick beetles in the morning, use row covers early in season, and knock aphids off with a strong water spray or insecticidal soap.

Adults skeletonize leaves and chew ragged holes through petals, leaving a lace-like framework of veins; feeding is heaviest in full sun mid-summer. Handpick adults into soapy water early morning when they are sluggish. Do not use Japanese beetle traps — they attract more beetles than they catch. Neem oil applied at dusk deters feeding adults.

Dense colonies on stem tips and flower buds cause curled, puckered new growth, sticky honeydew residue, and sooty mold on leaves below. Knock colonies off with a firm water jet. Follow up every 4–5 days with insecticidal soap or diluted neem oil until clear. Encourage ladybugs and lacewings as biological control.

Tiny white adults fly up in a cloud when leaves are disturbed; nymphs feed on leaf undersides causing yellowing, wilting, and sticky honeydew. Yellow sticky traps catch adults. Spray leaf undersides thoroughly with insecticidal soap or neem oil every 5–7 days for 3 weeks. Remove heavily infested leaves.

Fine pale stippling on upper leaf surfaces and thin webbing on undersides in hot, dry spells; heavy infestations cause bronzing and early leaf drop. Mist foliage to raise humidity and knock mites off. Apply neem oil or a miticide (e.g., spinosad) to both leaf surfaces; repeat weekly for 3 applications.