Abstract
Field plots of maize, pearl millet (Pennisetum americanum) and sorghum in Oklahoma were infested by hand with egg-masses of Diatraea grandiosella Dyar to study the effects of infestation time and planting date. The different food-plants reacted similarly, but maize had the greatest amount of damage and millet had the least. Plants infested 2 weeks after anthesis had the least stalk tunnelling, but maize with the earliest infestation time had fewer ears tunnelled. Late plantings of maize and male fertile sorghum had more damage than earlier plantings. The intermediate planting of millet had the least tunnelling. Late-planted maize yielded the least. Conversely, millet and sorghum had heavier losses when planted earlier. Male sterile sorghum (no pollen) had a higher percentage of tunnelled plants and slightly longer tunnels, but fewer heads tunnelled, when compared with male fertile sorghum
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