The influence of temperature and photoperiod on the preoviposition duration and oviposition of the strawberry root weevil, Otiorhynchus ovatus (L.), were studied in strawberry (Fragaria X ananassa Duchesne Variety ‘Totem’). In one experiment, adults were subjected to constant temperatures from 3 to 33°C at 3°C intervals and in another experiment adults were subjected to four photoperiods at 21°C. Oviposition was monitored for all treatments. Adults fed at all temperatures from 3 to 33°C and oviposited at temperatures between 18 and 30°C. The longest preoviposition period (32 d) and the fewest total number of eggs (2) were observed at 18°C. The shortest preoviposition period (15 d) and the largest total number of eggs (282) were observed at 27°C. A temperature range of 21–27°C appeared to be optimum for oviposition. Within this range, the lowest mortality, shortest preoviposition period, longest oviposition period, and greatest total number of eggs were observed. Weevils oviposited at all photoperiods. Length of preoviposition period and egg viability did not vary significantly among photoperiod treatments. Adults oviposited an average of 15 eggs at 12:12 (L:D) h and an average of 148 eggs at 18:6 h (L:D) h. A linear regression model predicted an increase of 23 cumulative eggs laid for each 2-h increase of daylength.
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Vol. 95 • No. 2