What would make a rosebud deformed and/or not open to full bloom? Also, why do some of my cone flowers have only a few petals open?

Gardens & Landscapes February 28, 2008 Print Friendly and PDF
A number of insects attack rose buds, causing them to become deformed or fail to open. Among these are chafer, curculio, midge, aphid, budworm, and thrip. The symptoms you describe may also be caused by botrytis (mold), but the affected buds or portions of them usually turn brown or black. Purple coneflower blossoms damaged by a disease called aster yellows often fail to develop properly and may have missing or dwarfed petals. Frequently, one side of the blossom is affected more than the other. Here are links to more information about this subject: http://www.extension.umn.edu/distribution/horticulture/components/6953_03.html http://fairfield.osu.edu/hort/landlingjun19.html Aster Yellows

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This work is supported by the USDA National Institute of Food and Agriculture, New Technologies for Ag Extension project.