Mountain Fire pieris (Pieris japonica) showing leaves stippled with pale, yellowish "splotches" is a classic sign of lace bug infestation. These tiny, sap-sucking insects feed on the undersides of leaves, causing the characteristic chlorotic stippling on the upper surface. Pieris, being in the same family (Ericaceae) as azaleas, is equally susceptible.
Apply a systemic insecticide containing imidacloprid (e.g., Bayer Tree & Shrub, Bonide Systemic Granules) in March. The chemical is translocated through the plant's sap, killing lace bugs as they feed. One application typically provides season-long control.
Pieris can also decline from cultural issues: too wet, too dry, or too much sun. Ensure the plant is in well-drained, acidic soil with afternoon shade and consistent moisture to keep it resilient.
Lace bug stippling on pieris
Close-up of damaged foliage
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