Quote:
Originally Posted by shcisamax
We planted a couple standard drift roses a month or so ago. I just noticed little white spots...especially on the buds...almost like sugar sprinkled. Any idea what it is and how to get rid of it?
|
Possiby powdery mildew
Symptoms: Leaves, buds, and stems are covered with a white powdery coating. Disease Cycle: The white fuzzy growth on the leaf surface contains thousands of fungal spores. Wind carries these spores to young leaves, causing more infection. Mildew diseases of other plants do not infect roses. Mildew develops rapidly during warm, humid weather.
Control: Throughout the growing season, the infection can be reduced through sanitation and fungicide application. Pruning and destroying all dead or diseased canes in the spring will reduce the initial fungus population. During the growing season, all diseased leaves should be destroyed. New growth is especially susceptible; therefore, a thorough spray or dust coverage of canes and upper and lower leaf surfaces (especially growing tips) is essential. Under most conditions, weekly applications are adequate; however, treat more often during rapid new growth, temperature fluctuations, and frequent rains.