FACTORS AFFECTING THE WINTERTIME PHYSIOLOGY OF ANTHONOMUS-GRANDIS BOHEMAN IN ARIZONA

The wintertime physiology of the bell weevil, Anthonomus grandis Bohem an, was evaluated under standard laboratory conditions using field col lections from Laveen, Arizona, during the winter and spring of 1987-19 88. Collections from both pheromone traps and bells were used to asses s sex ratio, survival, reproductive behavior and adult longevity. A si gnificantly higher level of survival was obtained among bell-enclosed weevils compared to that of trap-collected weevils. Unlike the weevils collected from bells, a significant number of trap-collected weevils were found to be reproductive. Upon subjecting weevils to three temper ature/photoperiod regimens [25 degrees C, 14:10 (L:D); 20 degrees C, 1 2:12 (L:D); and 15 degrees C, 10:14 (L:D)], results indicated that hig her temperature with longer light periods was most conducive to comple tion of diapause and postdiapause development. On transferring sub-sam ples to altered temperature and photoperiod regimens, temperature was determined to be critical in terminating diapause. Longevity studies s howed that 20 degrees C, 12:12 (L:D) photoperiod was optimal for survi val of both fed and unfed weevils.