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Rose thrips

8 host plants

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Data Coverage 1 of 6 dimensions
Host Plants
GDD Threshold
Peak Activity
Damage Severity
Monitoring
Regional Notes

Slender, cigar-shaped thrips less than 1/16 inch long feed on rose petals and buds in Western Washington, causing browning or curling at petal edges and silvery-white streaks on foliage. Infested flowers develop brown spots on petals, deformed buds that fail to open, and brown scorched edges. White and light-colored roses are particularly attractive targets.

Scout opening buds for damage; shake blooms over white paper to confirm thrips. Discard heavily infested buds. Promote air circulation through pruning. Horticultural oil or soap before flowers open provides control; however, minor cosmetic damage is often acceptable without intervention.

Quick Reference

Host Plants
8

Cultural Controls

  • cultural control Western flower thrips may be reduced by removing as many broadleaf flowering plants as possible from the vicinity of the trees, as this provides an alternate host.
  • Grass groundcovers around the trees provide competition for clovers and winter annuals that are alternate hosts.
  • Management-

Host Plants (8)