Seasonal Occurrence of Diapause in the Boll Weevil in Mississippi

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Abstract
Initial entry into diapause by segments of populations of the boll weevil (Anthonomus grandis Boheman) were studied in one field in 1958 and in seven fields in 1959. In the 1958 field diapause occurred by August 26. In the 1959 fields it was observed as early as August 11 and as late as September 8. Weevil populations generally entered diapause in two distinct periods. Gross observations indicated that entry into diapause in the first period was related to the maturity of the plants in the different fields, An adequate food supply appeared to be necessary. Diapausing weevils were first recovered from ground trash on September 10 in 1958 and September 9 in 1959, which indicated movement by diapausing segments of the weevil populations to overwintering quarters well in advance of the first killing frost.

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