The root weevil Diaprepes abbreviatus (L.) was reared on artificial diet under controlled conditions of temperature and humidity. The lower thermal threshold for development of neonate larvae was estimated to be 15°C. The growth rate of neonate larvae increased exponentially with increasing temperature up to 30°C. The growth rate of later instars, however, was suppressed at 30°C and mortality was higher than that of larvae reared at 26°C. Larvae reared as late instars only (>56 d old), or continuously at 30°C, had increased mortality and produced smaller adults than larvae reared at 22 and 26°C. Larvae reared as late instars only (>56 d) or continuously at 22°C had similar survival rates compared with those reared at 26°C, and they emerged as larger adults compared with larvae reared at 26 or 30°C. The time required for development from neonate to pupation was 125 ± 3 d (mean ± SEM, n = 38) at 26°C. Duration of the pupal stage was inversely proportional to temperature between 22 and 30°C. Pupal mortality was higher at 30°C than at 22 or 26°C. The total time required for a single generation from oviposition to adult emergence was estimated to be 154 d at 26°C and adequate humidity. Cumulative mean air and soil temperatures and rainfall for a location in central Florida were analyzed and presented for the period October 1991 through January 1999.
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