CONSIDERING MICROBIAL PRODUCTS? ASK THESE QUESTIONS The Iowa Corn Promotion Board (ICPB) invests corn checkoff dollars to develop and defend markets, fund research and provide education about corn production and uses. The ICPB provides information and educational opportunities for farmers to use to make production decisions that work best for their farm, which includes staying knowledgeable of new market opportunities. The development and marketing of microbial products (also known as biological products) has increased dramatically in recent years and projections predict this growth will accelerate. The ICPB is providing you with this grower guide to help you address questions when deciding if these products are right for your operation. With hundreds of companies working to develop new microbial products claiming to promote plant growth, bolster yields and/or safeguard plant health, determining what (if any) products are worth trying can be overwhelming. We put together a list of fundamental questions to guide that vetting process and help farmers make informed decisions in a rapidly evolving market filled with opportunities and uncertainties.