What's eating my madagascar periwinkle (vinca)?

Madagascar periwinkle is most seriously damaged by thrips, which scar petals and can spread viruses, and by aphids on flower stems. Spider mites are a risk in hot, dry conditions. Caterpillars occasionally chew foliage. This plant has some natural pest resistance, but thrips in particular should be controlled quickly to protect flowers.

Silvery streaking and distortion on petals; tiny black specks on flowers; blooms fail to open fully Use blue sticky traps; spray with spinosad or insecticidal soap, focusing on flower buds; remove damaged flowers promptly

Soft insects clustered on flower stems and new growth; sticky honeydew; distorted shoot tips Knock off with water spray; apply neem oil or insecticidal soap; attract beneficial insects with companion planting

Pale stippled leaves in hot dry spells; fine webbing on undersides; reduced vigor Water plants well and increase humidity around them; spray with neem oil or miticide every 7 days