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Offspring sex ratio and reproductive tactics of Leptocybe invasa (Hymenoptera: Eulophidae): testing the effect of environmental characteristics

Published online by Cambridge University Press:  25 July 2018

Xia-Lin Zheng ,
Kai Lin ,
Zong-You Huang ,
Jun Li ,
Zhen-De Yang ,
Xiu-Hao Yang  and
Wen Lu
Xia-Lin Zheng
Affiliation:
Guangxi Key Laboratory of Agric-Environment and Agric-Products Safety, College of Agriculture, Guangxi University, Nanning 530004, China
Kai Lin
Affiliation:
Guangxi Key Laboratory of Agric-Environment and Agric-Products Safety, College of Agriculture, Guangxi University, Nanning 530004, China
Zong-You Huang
Affiliation:
Guangxi Key Laboratory of Agric-Environment and Agric-Products Safety, College of Agriculture, Guangxi University, Nanning 530004, China
Jun Li
Affiliation:
Guangxi Key Laboratory of Agric-Environment and Agric-Products Safety, College of Agriculture, Guangxi University, Nanning 530004, China
Zhen-De Yang
Affiliation:
College of Forestry, Guangxi University, Nanning 530004, China
Xiu-Hao Yang
Affiliation:
Department of Guangxi Forestry Pest Management, Nanning 530028, China
Wen Lu*
Affiliation:
Guangxi Key Laboratory of Agric-Environment and Agric-Products Safety, College of Agriculture, Guangxi University, Nanning 530004, China
*
*E-mail: [email protected]
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Abstract

Environmental characteristics (for example, temperature, photoperiod) as seasonal cues can affect the offspring sex ratio and reproductive tactics of many hymenopteran insects. Leptocybe invasa Fisher & La Salle is the most critical invasive insect pest of Eucalyptus spp. in the world and displays thelytokous reproduction. In the current study, we studied the effects of temperature and photoperiod on offspring sex ratio and reproductive tactics in L. invasa. Results show that sex ratio (female: male) of L. invasa was under 15, 25 and 35 °C with both L 12: D 12 and L 16: D 8, and cold and thermal acclimation were 74.5:1, 71.0:1, 59.0:0, 17.3:1, 53.0:0, 64.0:0, 47.0:1 and 56.0:0, respectively, which was highly significantly female biased and with no significant difference due to temperature or photoperiod. Offspring virgin females oviposited and induced the bump-shaped galls on plants under the same conditions as described above. Constant temperature, photoperiod and their interaction, and cold and thermal acclimation had no significant effect on the infestation rates of Eucalyptus branches induced by offspring virgin females. Thus, temperature, photoperiod and cold and thermal acclimation did not influence female-biased sex ratio and tactics with thelytokous reproduction of offspring females in L. invasa.

Keywords

Eucalyptus gall wasptemperaturephotoperiodoffspring sex ratiothelytoky
Type
Research Paper
Information
International Journal of Tropical Insect Science , Volume 38 , Issue 4 , December 2018 , pp. 394 - 399
Copyright
Copyright © icipe 2018 

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