“We are done planting,” Johnson said, “and most of the fields have emerged. There was some stand reduction from the cold weather, but nothing drastic.
“Development has been slow and could cause pollination problems later on.”
For areas of the county where there was flooding, Schmitt said corn and soybeans can normally only survive complete submersion for two to three days. Plants not totally submerged will survive considerably longer, he said.
“Now we will be scouting for black cutworms” Hofer said.
According to Schmitt, black cutworms do not over-winter in Iowa. Rather, moths fly in from the south and lay eggs which hatch into hungry worms.
“There have been a few significant moth flights, but that does not mean there will be much cutting,” Schmitt said. “There is a network of black cutworm moth traps across the state, and with knowledge of when they occur, and by using daily growing degree temperatures we can predict fairly closely when cutting may begin, if indeed it does.”
Some low-lying fields have had new depositions of soil on top of planted ground, Schmitt said.
“Corn and soybeans that had emerged will be lost. Corn and soybeans that had not yet emerged can still come up from greater depths, especially corn.
“The limit from which corn can emerge is depths of four to five inches. The soybean, because the plant must push the seed up to the surface, is less capable of emerging from greater depths.”