Abstract
1. Under optimum conditions for corn production, if the seed is viable, fungous infection of the type usually called root rot does not affect the yield. 2. Extremely high soil temperatures do not increase the susceptibility of corn to diseases, although the corn may be killed by the extreme heat. The Oklahoma soil temperature approached the thermal death point of maturing corn. 3. Applications of iron and aluminium salts do not increase the susceptibility of corn to diseases. In the case of clay soils, a limited application seems to be beneficial, perhaps as a flocculant. 4. Colloidal soils induce an extraordinary development of secondary roots in corn plants and render them more susceptible to fungous infection. Lesions originate at points where secondary roots break through the cortex. 5. A large percentage of corn rots may be eliminated by flocculating colloids in the soil, allowing the normal development of the plant.
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