Abstract
A 3-year study of the dispersal of the maize weevil, Sitophilus zemais Motschulsky, from a corn storage bin was made at Baton Rouge. Dispersal was determined by the use of sticky traps. Beginning in January and continuing through December adult weevil emergence occurred on days when the temperature reached 23.3°C. Weevil dispersal reached a peak about July 7 (average of 3 years) after which it declined. Dispersal practically ceased hy the end of the year. Greatest emergence occurred during the warmer months. Dates of peak emergence, however, differed for each of the 3 years. The sex ratio of the trapped weevils was approximately 1: 1. Almost 100% of the females leaving the bin had been mated. Time of greatest dispersal flight occurred between 4 and 6PM. This period followed the warmest part of the day. More maize weevils were found to enter a field of corn at average plant ear height than at a level between 1 and 2 feet elevation.
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