Degree Day Information for Iowa

Pollination season is here

About one-third of the corn across Iowa is tasseled, with some fields showing pollen-receptive silks.

With a very few exceptions, we have ample moisture to avoid drought stress during corn pollination. Soybeans in Iowa are mostly self-pollinated indeterminate flowering, and most fields are blooming now. Wetness in June has led to uneven color and growth of both corn and soybean.

Throughout Iowa, foliar diseases of soybeans are common, especially brown spot and bacterial blight. They are both common, but neither of these poses much of an economic threat, and generally, no treatment is advised.

Updated July 22, 2004.