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Longevity and Reproduction of Ostrinia scapulalis (Lepidoptera: Crambidae) Adults on Constant Temperatures
Several properties related to longevity and reproduction of O. scapulalis adults were investigated on nine constant temperatures (13, 16, 19, 22, 25, 28, 31, 34 and 36℃). Thirty mating pairs on each temperature were separately prepared on the emerged days of adults, supplied with distilled water and 10% sucrose solution in small plastic cages, and observed every day. The adults could not produce fertile eggs on 13 and 36℃. The highest mating rate (ca. 47%) was observed on 19℃, and the lowest mating rate (3.3%) on 34℃. The mean longevity of mated female was observed in the range from ca. 9 to 52 days, while that of male was in the range from 10 to 31 days. The mean pre-oviposition period was longest (ca. 16 days) on 16℃ and shortest (ca. 3 days) on 31℃. The oviposition period was longest (ca. 16 days) on 19℃ and shortest (ca. 3 days) on 34℃. The low fecundity (ca. 22∼25 eggs/pair) was observed on 16 and 34℃, while 147∼416 eggs per pair were produced in other temperatures. The production pattern of fertile eggs on each temperature was analyzed. Fifty percent of production of fertile eggs was observed most rapidly on 3-day-old female at 28℃. In this study, a few properties of the mated adults were compared to those of the unmated one. Finally a few models were adopted to generalize some properties.
