|Dear Home Depot,
Our rose blooms are getting smaller and the leaves are yellow with black spots. What should we do to correct this?
Black spot of roses is caused by a fungus. It is a major problem on roses across the country. The best way to manage it is to plant resistant varieties. There are several fungicides registered for use on roses that will control black spot, but regular spraying is required to maintain control on susceptible varieties. When left untreated the bush loses vigor due to a lack of adequate foliage to make carbohydrates. Thus you end up with a weaker bush with less blooms.
Your Home Depot garden center carries a number of products to combat black spot on roses. A garden center manager can direct you to an appropriate product that they carry.
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