. Bulletin of the Department of Agriculture. Agriculture. 28 BULLETIN 926, V. S. DEPARTMENT OF AGRICULTURE. period of clays. A total of 298 weevil days was required by the 10 female weevils bred from long-staple cotton bolls, or an average period of days from egg to adult. The sea-island cotton bolls produced 30 male weevils that required 953 weevil days from egg to adult, or an average developmental period of days. A total of 18 female weevils bred required 623 Aveevil days, or an average period of days for development from egg to adult. (Fig. 12.) Since the bolls had
. Bulletin of the Department of Agriculture. Agriculture. 28 BULLETIN 926, V. S. DEPARTMENT OF AGRICULTURE. period of clays. A total of 298 weevil days was required by the 10 female weevils bred from long-staple cotton bolls, or an average period of days from egg to adult. The sea-island cotton bolls produced 30 male weevils that required 953 weevil days from egg to adult, or an average developmental period of days. A total of 18 female weevils bred required 623 Aveevil days, or an average period of days for development from egg to adult. (Fig. 12.) Since the bolls had probably been punctured from 5 to 7 days before they were bagged, it is evi- dent that the developmental period of the boll weevil in green cotton bolls is approximately 35 to 40 days under the most favor- able summer temperatures and longer during the fall months. Howe ^ states that the develop- mental period of the boll weevil in green upland cotton bolls at Tallulah, La., under insectary conditions, was days. At Madison, Fla., the developmental period of the boll weevil in green cotton bolls under actual field conditions more than doubles Howe's Fig. 12.—Four cavities in whicli four boll weevils were reared in a sea- island cotton boll, ^Madison, Fla. FECUNDITY OF THE BOLL WEEVIL IN UPLAND AND SEA-ISLAND COTTON BOLLS. Throughout the season of 1918 attempts were made to secure rec- ords of the fecundity of the weevil in green cotton bolls. More than 200 pairs of weevils were under observation at different times during the season. In no case were clear and concise records secured for individual weevils. For some peculiar reason the females did not oviposit freely in the green cotton bolls under insectary conditions. PREFERENCE SHOWN BY FEMALE WEEVILS FOR OVIPOSITION IN SEA-ISLAND AND UPLAND COTTON FRUIT. An experiment to determine the preference by the boll weevil for deposition was made by confining six female weevils over upland and sea-island cotton fruit.
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