Several shots of operations in commercial seed factory. Various shots of ears of corn "bagged" to ensure self-pollination. CS of self-pollinated corn showing hereditary weakness, mutation, farm men examining corn and taking notes. Numerous ECUs of corn borers in cross section of corn stalk. Numerous ECUs of young corn buds, sild tassels and mature corn kernels. Shots of scientist in field examining mature ears of hybrid corn. CSs of corn showing diseases that result from hereditary weaknesses. CSs of beetles and aphids on corn. Various shots of forage harvester cutting corn. Several shots of cut corn being delivered to storage bins. Shots of corn being loaded by chute into storage bins in field.