Comparative studies on the fecundity of three aphidophagous coccinellids (Coleoptera: Coccinellidae).

Comparative life table statistics for the ladybeetleScymnus syriacusreared on the green citrus aphid,Aphis spiraecola, fed on two host plants

“…Since it takes into account variation in developmental rates among individuals, it is possible to demonstrate stage overlap during the development of a cohort (Amir‐Maafi & Chi 2006). The generation time for S. syriacus on spirea was similar to that for S. apetzi ( ∼ 40.7 days) and that on Thompson orange was similar to that for S. subvillosus ( ∼ 38.3 days) (Atlihan & Kaydan 2002), and these values were higher than those reported for S. huffmanni ( ∼ 20.5 days) (Kawauchi 1985) and S. marginicollis Mannh ( ∼ 22 days) (Buntin & Tamaki 1980). The doubling time for S. syriacus on spirea was less than that on Thompson orange, suggesting that spirea is more suitable for an increase in the predator's population.…”

Development and reproduction of an aphidophagous coccinellid, Propylea japonica (Thunberg) (Coleoptera: Coccinellidae), reared on an alternative diet, Ephestia kuehniella Zeller (Lepidoptera: Pyralidae) eggs

“…Sasaji (1978) reported that egg cannibalism of P. japonica was observed in open fields and hatchability ranged from 60 to 70%. Kawauchi (1985a) also reported that the percentage of egg cannibalism by larvae of P. japonica was about 15%. In our experiment, the hatchability ranged from 60.8 to 77.5% and egg cannibalism by larvae was frequently observed, especially for the large egg batches.…”

“…Although the amount of predation by larvae and adults is less than that by larger lady beetles such as Harmonia axyridis Pallas and Coccinella septempunctata bruckii Mulsant, the intrinsic rate of natural increase of P. japonica is 1.24 times that of C. septempunctata (Kawauchi, 1985a). In addition, P. japonica can reproduce under poor diet conditions (Kawauchi, 1985a) and survive a wide range of temperatures, but does not undergo estivation (Kawauchi, 1985b). For these reasons, P. japonica is regarded as an important regulating factor for the aphid populations in open fields (Kawauchi, 1992).…”

Effects of a microsporidium from the convergent lady beetle, Hippodamia convergens Guérin–Méneville (Coleoptera: Coccinellidae), on three non-target coccinellids

“…Similarly, both uninfected and microsporidia-infected C. septempunctata from the present study laid more eggs (mean: 2111 and 1900 eggs, respectively) and lived longer than they did during previous studies. In a study conducted by Kawauchi (1985), C. septempunctata produce 1660.5 eggs when fed cotton aphids, Aphis gossypii Glover (14L:10D, 25°C). When fed cowpea aphids, Aphis craccivora Koch, C. septempunctata laid 1060.7 eggs and lived about 70 days (14L:10D, 25°C; Omkar et al, 2005).…”