Department of Entomology, Faculty of Agriculture, Tarbiat Modares University, P.O. Box 14115-336, Tehran, Iran.
J Econ Entomol. 2010 Apr;103(2):292-301. doi: 10.1603/ec09063.
Alfalfa weevil, Hypera postica (Gyllenhal) (Coleoptera: Curculionidae), is among the most destructive pests of alfalfa, Medicago sativa L., in the world. Survivorship and fecundity schedules of H. postica were investigated to characterize the population growth potential of the weevil at six constant temperatures: 11.5, 14.0, 19.0, 24.0, 29.0, and 31.5 degrees C. Preoviposition period, oviposition period and female longevity significantly decreased with rising temperature within the temperature range tested. At the respective temperatures adult female lived an average of 294.2, 230.2, 163.6, 141.0, 84.10, and 32.9 d, with average lifetime progeny production of 470, 814, 2209, 3619, 2656, and 338 eggs per female. The net reproductive rates (R0) were 86.9, 288.0, 869.7, 1,479.7, 989.8, and 107.8 females per female, respectively. Mean daily fecundity (Mx) was modeled as a function of time by using both Enkegaard and Analytis models. Survivorship data (l(x)) of adult females were summarized and compared using the shape and scale parameters of the Weibull frequency distribution model across the temperature range tested. Life table entropy values within the range 14.0-31.5 degrees C (H < 0.5) indicates Slobodkin's type I survivorship curve; however, the value of 0.806 at 11.5 degrees C (H > 0.5) corresponds to type III. As temperature increased, the r(m) exhibited an asymmetrical dome-shaped pattern, with a maximum value of 0.114 females per female per d at 29.0 degrees C. The r(m)-temperature relation of weevils was modeled and critical temperatures (T(Min), T(Opt), and T(Max)) for intrinsic rate of increase of the weevil were computed as 8.83, 30.61, and 32.14 degrees C and 5.72, 29.94, and 32.12 degrees C by using Analytis/Allahyari and Analytis/Briere-2 models, respectively.
苜蓿叶象甲，Hypera postica (Gyllenhal)（鞘翅目：象甲科），是世界上苜蓿草最重要的破坏性害虫之一。本研究旨在探讨苜蓿叶象甲在六个恒温（11.5、14.0、19.0、24.0、29.0 和 31.5°C）下的生存力和繁殖力，以描述象甲种群的增长潜力。在测试温度范围内，预产卵期、产卵期和雌虫寿命随温度升高而显著缩短。在相应温度下，成年雌虫的平均寿命分别为 294.2、230.2、163.6、141.0、84.10 和 32.9 d，平均终生后代产量分别为 470、814、2209、3619、2656 和 338 个卵/雌虫。净生殖率（R0）分别为 86.9、288.0、869.7、1479.7、989.8 和 107.8 只雌虫/雌虫。平均日繁殖力（Mx）通过使用 Enkegaard 和 Analytis 模型，以时间为函数进行建模。通过测试温度范围内 Weibull 频率分布模型的形状和尺度参数，总结和比较了成年雌虫的存活率数据（l(x)）。在 14.0-31.5°C 范围内，生命表熵值（H<0.5）表明 Slobodkin 生存曲线为 I 型；然而，11.5°C 时的值为 0.806（H>0.5），对应于 III 型。随着温度的升高，r(m)表现出不对称的钟形模式，在 29.0°C 时达到 0.114 只雌虫/雌虫/天的最大值。用 Analytis/Allahyari 和 Analytis/Briere-2 模型计算了象虫 r(m)-温度关系和象虫内禀增长率的临界温度（T(Min)、T(Opt)和 T(Max)），分别为 8.83、30.61 和 32.14°C 和 5.72、29.94 和 32.12°C。
