Fight 'big four' rose problems with prevention strategies

CORVALLIS, Ore. – Charmingly mild weather this winter will most likely coax roses into bloom early, which means dealing with the usual diseases and pests earlier, too. When it comes to one of the country’s most popular perennial plants, the “big four” vexations are powdery mildew, black spot, rust and aphids, according to Jay W. Pscheidt, a plant pathology specialist with Oregon State University Extension Service. More recently, downy mildew, which looks strikingly similar to black spot, has become an increasing problem. “People are confusing them,” he said.

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