ABSTRACT

The ladybird beetles Tenuisvalvae notata (Mulsant), and Cryptolaemus montrouzieri Mulsant (Coleoptera: Coccinellidae) are important biological control agents of mealybugs (Hemiptera: Pseudococcidae). One of the factors affecting the establishment and success of these predators is temperature, which imposes limits on their development and distribution. In this study, the developmental times and reproduction of these ladybirds at 25°C and 28°C were estimated. We also estimated fertility life-table parameters and the number of generations that could potentially be produced annually in 6 localities of interest. For both species, the developmental period (egg to adult) declined 6–10 days with an increase in temperature from 25°C to 28°C. However, this increase in temperature did not significantly affect female longevity or egg production. The mean generation time (T), and intrinsic rate of increase (r_m) were statistically higher at 28°C for T. notata. The r_m varied from 0.052 to 0.063 for T. notata and from 0.048 to 0.051 for C. montrouzieri reared at 25°C and 28°C, respectively. We estimated that T. notata and C. montrouzieri can complete 9 and 12 generations annually, respectively, especially in Surubim and Bom Jardim, in Pernambuco, and Cruz das Almas, in Bahia, with the highest estimated number of generations due to temperatures higher. Results confirm the direct influence of temperature on the development and distribution of these ladybird beetle species, which is important to the biological control of mealybugs in infested areas.

摘要

瓢虫甲虫Tenuisvalvae notata (Mulsant) 和Cryptolaemus montrouzieriMulsant（鞘翅目：瓢虫科）是粉蚧（半翅目：Pseudococcidae）的重要生物防治剂。影响这些捕食者的建立和成功的因素之一是温度，这对它们的发展和分布施加了限制。在这项研究中，估计了这些瓢虫在 25°C 和 28°C 下的发育时间和繁殖。我们还估计了生育生命表参数和 6 个感兴趣的地区每年可能产生的世代数。对于这两个物种，随着温度从 25°C 升高到 28°C，发育期（从卵到成虫）减少了 6-10 天。然而，这种温度升高并未显着影响雌性寿命或产蛋量。平均世代时间 (T) 和内在增长率 ( r_m ) 在 28°C 时对于T. notata具有统计学意义。分别在 25°C 和 28°C 下饲养的T. notata和C. montrouzieri的r _m从 0.052 到 0.063不等，从 0.048 到 0.051不等。我们估计T. notata和C. montrouzieri 每年可以分别完成 9 代和 12 代，特别是在伯南布哥的 Surubim 和 Bom Jardim 以及巴伊亚的 Cruz das Almas，由于温度较高，估计代数最高。结果证实了温度对这些瓢虫物种的发育和分布的直接影响，这对感染地区粉蚧的生物控制很重要。