Effects of different sex ratios and rearing densities on reproduction of Hippodamia variegata

doi:10.14088/j.cnki.issn0439-8114.2026.08.012

Abstract

Abstract: In order to explore the effects of different sex ratios and rearing densities on fecundity (egg production) and hatching rate of Hippodamia variegata, Acyrthosiphon pisum was used as food in Petri dishes (90 mm diameter). The fecundity and hatching rate of adult Hippodamia variegata reared at different sex ratios (1∶1, 2∶1, 3∶1, 4∶1, 5∶1) were studied, the optimal sex ratio was selected, and the effects of rearing density on its egg production and hatching rate were further investigated. The results showed that different sex ratios and densities had significant effects on fecundity and hatching rate of Hippodamia variegata. When the sex ratio was 1∶1, the per female fecundity of Hippodamia variegata was 623.30 ± 205.66 eggs, which was significantly higher than that at sex ratios of 2∶1, 3∶1, 4∶1, and 5∶1. When the sex ratio was 1∶1, the hatching rate was 80.49% ± 3.31%, which was significantly higher than that at 5∶1. At the sex ratio of 1∶1, regarding rearing density, at a density of 4 individuals (2 females + 2 males), per female fecundity was 432.75 ± 102.59 eggs, which was significantly higher than that at densities of 8 (4 females+4 males), 12 (6 females+6 males), and 16 (8 females+8 males) individuals, and the hatching rate at a density of 4 individuals (2 females+2 males) was 74.88% ± 14.64%, which was significantly higher thanthat at densities of 12 (6 females+6 males) and 16 (8 females+8 males), but was not significantly different from that at a density of 8 (4 females+4 males). Based on the combined results of sex ratio and density on fecundity and hatching rate, it was shown that when the sex ratio was 1∶1 and the density was 4 individuals (2 females + 2 males), it was most suitable for its reproduction.

Key words: Hippodamia variegata, Acyrthosiphon pisum, rearing density, biological control

CLC Number:

LIU Hong-ling, LIU Jun-feng, XIE Xin, TANG Xiao-qiang, XU Bing-yan, LI Yang, CHEN He-zhu, XIAO Ke-jun, WEI Lian, WU Xing-long, PU De-qiang. Effects of different sex ratios and rearing densities on reproduction of Hippodamia variegata[J]. HUBEI AGRICULTURAL SCIENCES, 2026, 65(8): 80-83.

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