Original illustration by PestControlBasics.com. Use anatomical labels above to confirm your identification.
Original illustration by PestControlBasics.com. Use anatomical labels above to confirm your identification.
Original illustration by PestControlBasics.com. Use anatomical labels above to confirm your identification.
🔍 Identification
Greenhouse whitefly (Trialeurodes vaporariorum): wings held flat and parallel to leaf surface when at rest; nymphs have waxy marginal fringe; more susceptible to many insecticides. Silverleaf whitefly / Bemisia (Bemisia tabaci): wings held tent-like at an angle when at rest; nymphs lack waxy fringe; causes additional disorders beyond feeding damage (squash silverleaf disorder, irregular ripening in tomato). More pesticide-resistant — has developed resistance to neonicotinoids, pyrethroids, and organophosphates in commercial populations.
🧬 Biology & Behavior
Both species cause similar feeding damage but Bemisia has dramatically higher pesticide resistance across all chemical classes. In commercial production, Bemisia requires rotation of insecticide modes of action every 1-2 generations to prevent resistance development. Identification matters because treatment protocols differ significantly.
⚠️ Damage & Health Risk
Feeding damage causing yellowing; honeydew production leading to sooty mold; virus transmission (Bemisia transmits 100+ plant viruses — far more than greenhouse whitefly); physiological disorders in squash and tomato (Bemisia only).
🔧 DIY Treatment
Yellow sticky traps for monitoring; insecticidal soap for greenhouse whitefly; for Bemisia: rotate between spirotetramat (Kontos), azadirachtin (Azamax), pyrifluquinazon (Rycar), and insecticidal soap — never rely on one chemistry. Biological control: Encarsia formosa parasitoid wasp highly effective for greenhouse whitefly.
👷 When to Call a Pro
Commercial greenhouse programs use rigorous resistance management rotation protocols with Bemisia — consult University Extension or certified CCA for current resistance management guidelines for your region.