Effects of prey species on the development and reproduction of Harmonia axyridis
Author of the article:ZHAO Ze-Ying1** ZHOU Shi-Min2 ZHAI Zheng-Guang2 CAI Hai-Lin2 ZOU Xi-Ming2 LI Fan2 CHEN Kun2 TA
Author's Workplace:1. College of Plant Protection, Hunan Agricultural University, Changsha 410128, China; 2. Changsha Tobacco Company of Hunan Province, Changsha 410011, China
Key Words: Harmonia axyridis; living diets; growth and development; life table; reproduction
Abstract:
[Aim] To determine the best prey species
for the large-scale, captive rearing of Harmonia axyridis. [Methods] Reproductive life tables were compiled for H. axyridis populations that
were fed on one of four prey species; Myzus persica, Aphis craccivora,
1st and 2nd instar larvae of Spodoptera litura or Argyrogramma agnata,
and the effects of prey species on their growth, development and reproduction,
of each population were compared. [Results] Prey species had a significant effect on the
larval period, survival rate, the pre-oviposition period, average fecundity and
hatchability (P<0.05). Specifically, H. axyridis fed on Ap.
craccivora and M. persica had shorter larval periods [(8.38±0.42)
and (9.25±0.39) d, respectively] and higher survival rates (91.70%±7.50% and
90.00%±6.30%, respectively), than those that were fed on Ar. agnata larvae
[(10.58± 0.49) d and 58.30%±7.50%, respectively) and S. litura [(10.95±0.66)
d and 50.00%±8.90%, respectively] (P<0.05). Approximately 90% of H.
axyridis that were fed S. litura larvae were unable to lay eggs.
However, those that were fed Ap. craccivora, M. persica and Ar.
agnata larvae laid eggs normally, had a shorter pre-oviposition period and
higher egg hatching rate. The pre-oviposition periods of H.
axyridis that were fed the above prey species were (5.48±0.17),
(5.87±0.27), and (5.70±0.30) d, the average fecundities were (792.47±60.89), (604.87±77.17)
and (167.93±47.73) grains/female, and the egg hatching rates were 93.83%±6.89%,
94.07%± 4.46% and 90.94%±7.16%. [Conclusion] Ap. craccivora and M. persica larvae and the 1st and 2nd instar larvae of Ar. agnata were the most
suitable of the four prey evaluated for captive rearing H. axyridis.
When the number of aphids is insufficient, 1st and 2nd instar larvae of Ar.
agnata can be provided as an alternative. These results should improve the
large-scale, artificial breeding of H. axyridis.