Cymbidium Pests: Chewing Damage, Bud Bumps, Scale—Systemic Insecticide Strategy

Question:

Large Cymbidium under lath in SoCal backyard—exposed to pests. Chewing on flower spike stems (dry brown areas), no snail trails. Buds: small bumps on exterior, chewed petal edges. 2 buds brown/shriveled, fell off. Scale on leaves. Multiple pests—eradication suggestions?

Answer:

Hi Jennifer,

Likely multiple pests. Exact ID needs visual, but: get systemic orchid insecticide from garden center. I use Orthene WP (wettable powder) for chewers—one bite, done. Another with imidacloprid works well. Whatever used: 3 applications over 3 weeks for unhatched eggs. Treat 2×/year: late winter/early spring + early-mid fall.

Jim Kawasaki
San Jose, CA