Nearly half of the corn is emerged across Iowa as of May 9 with up to 60 percent emerged in the north central cropping district according to USDA-NASS. As mentioned in a May 6 Integrated Crop Management News article, 2010 has been one of the best planting seasons in history. Unfortunately, recent cold temperatures and a hard freeze across central and northern areas of Iowa resulted in some foliar damage to emerged corn seedlings.