How to Manage Pests
UC Pest Management Guidelines
Scientific name: Metopolophium dirhodum
(Reviewed 2/07, updated 2/09, pesticides updated 7/16, corrected 7/19)
In this Guideline:
Rose-grain aphid is a large green aphid that may have a dark green stripe down the middle of the back. It looks similar to greenbug but is larger, the joints in the antennae are darker than the middle portion of the antennae, and the antennae usually reach beyond the base of the cornicles.
Rose-grain aphids do not inject a toxin as they feed and generally cause very little injury. Since they are easily confused with the more damaging greenbug, care should be taken in identification. If you are not sure of the species, contact your farm advisor before any sprays are applied.
Rose-grain aphid is a vector of BARLEY YELLOW DWARF virus.
Rose-grain aphid is attacked by the natural enemy species discussed under APHIDS–GENERAL CONSIDERATIONS.
Be sure of the species identification before spraying.
Economic thresholds have not been established for rose-grain aphid.
UC IPM Pest Management Guidelines:
Insects and Mites
L. D. Godfrey, Entomology, UC Davis
Acknowledgment for contributions to Insects and Mites:D. Gonzalez, Entomology, UC Riverside
C. G. Summers, Entomology, UC Davis/Kearney Agricultural Center, Parlier