Although a problem, aphids are easily controlled with regular applications of most general use insecticides. Several species of spider mites occur on roses. The most common are the red spider mite and the two spotted spider mite. Make at least two applications of a recommended miticide about seven days apart to control. Cucumber beetles and grasshoppers can be controlled by Thiodan or Sevin.
Roses thrive on regular fertilization.
Begin a fertilization program when new growth begins in the spring and continue through late August or early September. Try to coincide fertilizer applications with pruning. If possible, use a slow release fertilizer that provides proper soil nutrients over a two to three month period. It is important to maintain proper soil moisture levels after fertilization. Garden centers will have many crape myrtles in May and June.