The American Phytopathological Society
http://www.apsnet.org
American Society of Agronomy
https://www.agronomy.org/
Crop Science Society of America
https://www.crops.org/
Illinois Soybean Association
http://www.ilsoy.org
Illinois Corn Growers Association
www.ilcorn.org/
Illinois Wheat Association
www.illinoiswheat.org/
Illinois Certified Crop Adviser Program
http://illinoiscca.org