Paul Bachi, University of Kentucky Research and Education Center, Bugwood.org
Potted shrub with leaf spots. Heavily infected leaves turn yellow and drop off readily. Knockout rose.
Paul Bachi, University of Kentucky Research and Education Center, Bugwood.org
Leaf spots with tan centers and darker brown borders. Knockout rose.
Paul Bachi, University of Kentucky Research and Education Center, Bugwood.org
Close-up of leaf spots. Spore-producing hyphae ("conidiophores") seen as dark, fuzzy clumps, in the center of the spot. Knockout rose.
Paul Bachi, University of Kentucky Research and Education Center, Bugwood.org
Infected leaf tissue seen under dark-field observation with spore-producing hyphae ("conidiophores") seen as dark brown clumps. Spores have been stained. Knockout rose.
Paul Bachi, University of Kentucky Research and Education Center, Bugwood.org
Dark-field observation of spore-producing hyphae ("conidiophores") seen as dark brown clumps. The several-celled spores have been stained. Knockout rose.
Paul Bachi, University of Kentucky Research and Education Center, Bugwood.org
Dark-field observation of spore-producing hyphae ("conidiophores") seen as dark brown clumps. The several-celled spores have been stained. Knockout rose.
Potted shrub with leaf spots. Heavily infected leaves turn yellow and drop off readily. Knockout rose.
Leaf spots with tan centers and darker brown borders. Knockout rose.
Close-up of leaf spots. Spore-producing hyphae ("conidiophores") seen as dark, fuzzy clumps, in the center of the spot. Knockout rose.
Infected leaf tissue seen under dark-field observation with spore-producing hyphae ("conidiophores") seen as dark brown clumps. Spores have been stained. Knockout rose.
Dark-field observation of spore-producing hyphae ("conidiophores") seen as dark brown clumps. The several-celled spores have been stained. Knockout rose.
Dark-field observation of spore-producing hyphae ("conidiophores") seen as dark brown clumps. The several-celled spores have been stained. Knockout rose.