Effects of photoperiod, temperature, and humidity on oviposition and egg development of Neodiprion fulviceps (Hymenoptera: Diprionidae) on cut branches of ponderosa pine
1990
Tisdale, R.A. | Wagner, M.R.
The effect of photoperiod, temperature, and humidity on oviposition and egg development was determined to optimize laboratory rearing of Neodiprion fulviceps Cresson on cut branches of ponderosa pine (Pinus ponderosa Dougl. ex Laws). The maximum number of eggs laid and eggs hatched occurred at 15 degrees C. No oviposition occurred at 4 degrees C. Egg development time was too slow to be practical at 10 degrees C; no eggs hatched after 75 d. No differences in number of eggs laid occurred at 30, 40, and 50% RH; however, number of eggs laid was significantly lower at 60%. The maximum number of eggs hatched and the shortest egg development time occurred at 50% RH. Photoperiod had no effect except on the percentage of hatch, which was greatest under short-day conditions. Egg incubation times were slightly shorter on seedlings than on mature cuttings.
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