Abstract
A useful level of resistance to Chilo zonellus (Swinhoe) exists in both maize (corn) and sorghum breeding material used in East Africa. Ratings for leaf feeding proved useful in separating resistant and susceptible maize inbreds but not maize hybrids or sorghum varieties. For these, larval counts and exit holes per plant might be used, but yield also would be an important criterion. Thus, a technique of applying recurrent selection to composite populations by infesting every plant with 1–3 egg masses in the leaf whorl and of basing the final selection on yield is likely to prove an effective method of developing types of maize and sorghum possessing enhanced resistance to C. zonellus .
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