9/12/2023 0 Comments Nootka rose rosa nutkanaThis is a more difficult question than one might imagine. For now, you can rejoice in the fact that the mites are curbing the growth and reproduction of the broom, and making your work a little bit easier! Read More Studies are underway to see if the mite affects non-target plants such as lupine. Andreas et al.) appeared in the 2011 XIII International Symposium on Biological Control of Weeds. To Classical Biological Control Agent?” (J. An abstract of an article entitled “The Scotch Broom Gall Mite: Accidental Introduction It has since spread through the Pacific Northwest. ![]() According to this informational page from University of California Statewide Integrated Pest Management Program, the mite was first seen on broom plants in Tacoma, WA and Portland, OR in 2005. This insect is apparently on the cutting edge of controlling invasive broom. I think what you are seeing on those browned and blackened plants is also a gall, caused by the Scotch broom gall mite (Aceria genistae). Your other question about dying Cytisus scoparius (Scotch broom) is especially interesting. The particular species of cynipid wasps which cause it are unlikely to affect plants which are outside the rose family. You could picky them off the roses, but that seems impractical in a restoration site, and besides they are fairly benign and attractive curiosities. Washington State University Extension’s HortSense page says that these galls which are caused by cynipid wasps will not harm the host plants. ![]() What you are describing on the roses sounds like mossy rose gall ( Diplolepis rosae).
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