A Gardeners Forum Forums Gardening Reference Gardening in 2004 Zucchini's dry leaves

Our garden have been growing great and our zucchini now producing. My husband faithful dusts the vegetables making sure each is covered well. Today we went out to look at the garden (yesterday we did not go out) and what do we see but our our main zucchini with loads of dry leaves, maybe 6 to 8, almost like they had been scorched by the sun. All other plants remained fine, but the zucchini. Is this some type of pest, mold, or what?

With what did you dust, and what time of day, and the weather conditions, sounds like chemical burn