We have pretty serious mildew problems on L. indica here, so usually spec the hybrids. Since the Petite series is L. indica I would assume that they have the same problems- am I right? Looking for a white dwarf crape myrtle that doesn't mildew....thanks.
|Petite Snow is a white flowering dwarf crape myrtle with moderate resistance to powdery mildew; Hopi has white, turning to pink flowers and good resistance to mildew; Acoma is a semi-dwarf with excellent disease resistance.
Be sure to plant in full sunshine with lots of room for good air circulation all around the plants and they will be less apt to be attacked by powdery mildew.
Best wishes with your crape myrtles!