Agricorp has extended the corn planting deadline to qualify for crop insurance by three days to June 18 for farmers in Lambton, Middlesex, Niagara, Chatham-Kent, Essex, and Elgin.
Many fields in those municipalities have been too wet to plant.
The relief is particularly important for dairy and beef farmers who use corn as silage.
Many cash crop farmers have switched plans from corn to soybeans.
Agricorp said it extended the deadline after consulting farm leaders. The actual decision rests with the Ontario Ministry of Agriculture, Food and Agribusiness.
