My zucchini has powdery mildew, as it does every year (new location this year). In the past, I’ve just ignored it, but I wonder if there’s anything I can spray it with to prolong the life of the plant and get the most zukes possible (crazy, I know!)
It is too late to try this year, but if you can spray the leaves with baking soda BEFORE the powdery mildew usually appears, than it will change the pH of the leaf surface, preventing the powdery mildew from growing there. You would need to reapply after rain and watering. As far as I know, the baking soda won’t make a difference, if you can already see white.
You might want to try Serenade, a spray of the bacteria Bacillus subtilis. Although this is probably also most beneficial as a preventative.
Viewing 3 posts - 1 through 3 (of 3 total)
You must be logged in to reply to this topic.
Welcome! I’m Margaret Roach, a leading garden writer for 25 years—at ‘Martha Stewart Living,’ ‘Newsday,’ and in three books. I host a public-radio podcast; I also lecture, plus hold tours at my 2.3-acre Hudson Valley (NY) Zone 5B garden, and always say no to chemicals and yes to great plants.