We have had a garden for five of the last seven years. Each summer the zucchini, squash, etc. takes off, it seems to get cut down prematurely by mold. I’ve got a few general tips on drainage as well as a spray on cure so it’s worth slogging on. As you know mold likes moisture so eliminating excess moisture is your first step.
Controlling moisture:
1) Remove dead leaves etc. from around the plants.
2) If you have mulch consider reducing the volume. (Sort of counter-intuitive for weeds…but we’re battling mold here.)
3) Increase air flow around the plant, if possible.
4) Don’t over water.
One fellow at the farmer’s market in Sun Prairie said that poor drainage can promote mold, so I put lots of sand into the soil bed one year..and pretty far down too. We still got hit with the mold problem although not as early.
Controlling mold:
1) Remove or cut branches/stems which show bad signs of mold. Example: The stem looks rotten and is runny. Cut all those parts out.
2) Toss moldy stems, leaves, etc. in the trash. Don’t compost them!
3) Wash your hands with soap & water immediately after touching moldy plants. You don’t want to spread it to the healthy ones.
4) Try not to touch healthy plants after they’ve been watered or rained upon.
5) Use a spray of 2 Tablespoons baking soda, 1 Tablespoon cooking oil, to almost one gallon of water. Spray on affected plants once a day for a week with one of those $4 water sprayers from the hardware store.
Controlling pests and mold/blight is a gardener’s chore, but it’s worth it. July and August are prime months for mold up here so a little daily vigilance could pay off. Then again it could just delay the inevitable mold killing your zucchini if you have very clay like soil…I’ve done everything “right” and still lost some plants. As the geeks say, “your mileage may vary.”
*I need to double check with my wife on the recipe, but you get the idea.