Not sure, but your ground looks awful dry.

Catherinet, thanks for your quick response. We've really gotten quite a lot of rain (and hose watered in between storms). I agree that the soil looks dry, but it really isn't. After a good rain I can't walk in the garden safely for a couple of days. We got probably an inch or so yesterday and I went in to the garden only to pick cukes and zucs--I sunk in about 1-1/2 inches.

Fungus but normal this late in the year.