Disease development is dependent on three factors: the presence of a suitable host, a source of disease-causing inoculum, and favorable weather conditions so that the disease can develop. Together, these factors are called the plant-disease triangle, and all three “corners” of the triangle are required for disease to become a problem in corn and soybean. If any of the factors are missing or inadequate, disease has trouble becoming established. As anyone who raised crops in 2012 was aware, there was a definite shortage of water for many parts of Iowa and elsewhere, coupled with very hot weather. This weather produced an environment that was not only not conducive to crop growth, but also detrimental to disease development. Moisture plays a large part in the ability of a disease-causing agent to infect and grow.