Abstract
A strong relationship was found between temperature and emergence of boll weevils from overwintering sites. The threshold temperature above which overwintering weevils accumulated heat units was 10.85°±1.3°C. Early fall cohorts required a higher number of accumulated heat units than did late fall cohorts. First-emerging weevils of early cohorts had a lower tendency to subsequently initiate flight activity than did first-emerging weevils of later cohorts. The temperature threshold for flight of 95–98% of newly emerging weevils was 20°C.
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