- First seen as reddish-purple spots on the leaves, the fungus quickly grows and the spots change to grayish white surrounded by red. The center white spots then fall out, leaving holes in the leaves, which then turn yellow and drop off.
(ref 2) - Red fungus uses the lesions for producing microscopic spores which spread from leaf to leaf and between plants by water droplets.
- Unlike black spot fungus, which prefers warm late spring weather, red fungus appears earlier while the temperatures are still cool.
- Red fungus can be treated with the same fungicides that are used for black spot, such as Funginex.
- To minimize the risk of developing red fungus, rose bushes should be spaced well apart, have weeds under control and should not be watered from above. Soaker hoses or drip lines will assure that the plants get adequate water without soaking the foliage.
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