Black spot of rose Scot Nelson
TheGardenLady wrote about the roses in her garden that get black spot. Many roses, unfortunately, are affected by this disease. As I had written, one is never to water roses overhead. Mechanical watering devices that come on automatically at a set time are especially problematic in overhead watering. TheGardenLady has seen blackspot in some major rose gardens or botanical gardens that do overhead watering. Also, one should water in the early morning hours so that hopefully water will dry or evaporate from the leaves later in the day. Do not water in the afternoon. Always let the water run near the base of the rose. A soaker hose might be best.
But what should one do if it rains? Mother Nature sends the rain from above at any time of the day or night. And if it is a particularly rainy season, that is when you can usually see a lot of black spot on the rose leaves. Sometimes the black spot can get so bad that it can defoliate the roses to make the plant look unsightly even though the flowers look attractive.Then without leaves, the plant gets sickly and is susceptible to other disease or problems. So what should one do?