High humidity and poor air circulation can result in powdery mildew—a white, powdery fungus—on rosemary plants. Powdery ...

If you've noticed mildew in your garden, you may be wondering if there are alternative remedies you can try, such as milk.

Also, be aware of these issues: Powdery mildew, which looks like white powder on plant leaves and stems, is seen in humid climates or on rosemary grown indoors. Rub off the powdery substance. Spray ...