Spider Mites on Weeping Pussy Willow

willow leaves, web, an

Weeping pussy willow: tiny yellow bugs, heavy webbing, rapid browning/decline in one week. Sevin failed.

Diagnosis: Spider Mites

• Not insects—arachnids. Pierce cells → speckling → bronzing → drop.
• Webbing at high populations.
• Cool-weather mites (spring/fall peaks); hot weather reduces them.

Monitoring & Treatment

1. White paper tap test: dozens/whack = serious.
2. Check weekly.
3. Miticides: insecticidal soaps, acephate+fenbutin oxide (Ortho Systemic/Orthenex).
4. Full foliage coverage essential. Sevin ineffective.

Nursery can recommend miticide for spider mites.