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
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

Connect with us

  • Facebook

Welcome

eXtension is an interactive learning environment delivering research-based information emerging from America's land-grant university system.

LOCATE

Donate to Consumer Horticulture

Your donation keeps eXtension growing.

Give Now