Biotic potential and reproductive parameters of Spodoptera dolichos (Lepidoptera: Noctuidae) in the laboratory

ABSTRACT The biotic potential and reproductive parameters of Spodoptera dolichos (Fabricius, 1794) were evaluated under controlled conditions (25 ± 1°C, 70 ± 10% RH and 14 hour photophase). The longevity, pre-, post- and oviposition periods, fecundity, and fertility of 25 couples were evaluated. The longevity of females (12.9 days) was not significantly different than that of males (12.4 days). The mean durations of the pre-, post- and oviposition periods were 3.0, 0.4 and 10.4 days, respectively. The mean fecundity was 4,086.0 eggs per female and mean fertility was 3,557.8 larvae per female. On average, a female copulated 1.4 times. The biotic potential of S. dolichos was estimated at 7.138 x 1018 individuals/female/year. The net reproductive rate (Ro) was 1,711.98 times per generation and the mean generation time (T) was 56.19 days. The intrinsic rate of increase (rm) was 0.133, with a finite rate of increase (l) of 1.142 per day. These results are compared with other species from Spodoptera and their relevance for management strategies of S. dolichos.

摘要 本研究在可控环境条件（温度25±1℃、相对湿度70±10%、光照周期14小时）下，评估了豆银纹夜蛾（Spodoptera dolichos，Fabricius, 1794）的生物潜能（biotic potential）与繁殖参数（reproductive parameters）。研究对25对成虫的寿命、产卵前期（pre-oviposition period）、产卵后期（post-oviposition period）、产卵期（oviposition period）、繁殖力（fecundity）及受精率（fertility）进行了测定。结果表明，雌成虫寿命（12.9天）与雄成虫寿命（12.4天）无显著差异。产卵前期、产卵后期与产卵期的平均时长分别为3.0天、0.4天和10.4天。单雌平均产卵量为4086.0粒，单雌平均受精幼虫数为3557.8头。雌成虫平均交配次数为1.4次。经估算，豆银纹夜蛾的生物潜能可达7.138×10¹⁸头/雌/年。净生殖率（net reproductive rate, R₀）为每世代1711.98倍，平均世代时间（mean generation time, T）为56.19天。内禀增长率（intrinsic rate of increase, rₘ）为0.133，日有限增长率（finite rate of increase, l）为1.142。本研究结果与夜蛾属（Spodoptera）其他物种的相关研究进行了对比，并探讨了该结果对豆银纹夜蛾防控策略的参考价值。