Powdery mildew is starting to grow on this squash. Mildews are fungal, so baking soda, potassium bicarbonate and cornmeal tea sprays are effective in treating it.(Howard Garrett) Well, how’s ...

Your description sounds a lot like powdery mildew, which is an easy disease to recognize, and it is common in the landscape at this time of year. It can be a problem that shows up on annuals ...

If you want to haul out chemical controls, any of these control powdery mildew: triadimefon (Bayleton), propiconazole (Banner), triforine (Funginex) and thiophanate methyl with mancozeb.