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The past month and a half has been nearly constant rain, I'm sure it has been like that for many other gardeners as well. My problem is, that finally 2 of my roses are losing the blackspot fight. I had been picking off affected leaves as soon as I saw them, and really, I am suprised it took so long with this weather to get to the point where I need to spray. My question is, how is the best way to spray when it won't stop raining? My concern is that the spray will just wash right off and have little effect, and I would like to avoid over-use of chemicals. In other words, I don't want to spray until it will actually be effective, and I am concerned too much spraying in so much rain will affect the groundwater. Does constant rain wash off the spray before it has a chance to work? What kind of dry weather window do I need to look for, or is there another factor that will help the effectiveness?
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