Abstract
Eighteen corn cultivars were tested for resistance to three corn pests (corn earworm, sugarcane borer, and corn silk maggot), and two diseases (corn rust and corn blight) at Mayagüez, Puerto Rico. Armyworm control with methomyl was necessary to produce a corn crop. Eighteen cultivars from Georgia were less resistant to pests and diseases than Mayorbela, Ibadan A, and Ibadan B. Significant differences were found between sprayed and unsprayed plots in yield and pest infestation.
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