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Biology of Euwallacea interjectus, an emerging poplar pest, reared on an ambrosia beetle artificial diet and medium of fungal symbiont

Published online by Cambridge University Press:  08 May 2024

Langlang Zheng Open the ORCID record for Langlang Zheng [Opens in a new window] ,
Shengchang Lai ,
Yang Zhou ,
Nan Jiang ,
Dejun Hao  and
Lulu Dai Open the ORCID record for Lulu Dai [Opens in a new window]
Langlang Zheng
Affiliation:
Co-Innovation Center for Sustainable Forestry in Southern China, Nanjing Forestry University, Nanjing 210036, China College of Forestry, Nanjing Forestry University, Nanjing 210036, China
Shengchang Lai
Affiliation:
Co-Innovation Center for Sustainable Forestry in Southern China, Nanjing Forestry University, Nanjing 210036, China College of Forestry, Nanjing Forestry University, Nanjing 210036, China
Yang Zhou
Affiliation:
Co-Innovation Center for Sustainable Forestry in Southern China, Nanjing Forestry University, Nanjing 210036, China College of Forestry, Nanjing Forestry University, Nanjing 210036, China
Nan Jiang
Affiliation:
Co-Innovation Center for Sustainable Forestry in Southern China, Nanjing Forestry University, Nanjing 210036, China College of Forestry, Nanjing Forestry University, Nanjing 210036, China
Dejun Hao
Affiliation:
Co-Innovation Center for Sustainable Forestry in Southern China, Nanjing Forestry University, Nanjing 210036, China College of Forestry, Nanjing Forestry University, Nanjing 210036, China
Lulu Dai*
Affiliation:
Co-Innovation Center for Sustainable Forestry in Southern China, Nanjing Forestry University, Nanjing 210036, China College of Forestry, Nanjing Forestry University, Nanjing 210036, China
*
Corresponding author: Lulu Dai; Email: dailulu@njfu.edu.cn
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Abstract

Euwallacea interjectus, a recently discovered pest in poplar plantations, poses a significant economic threat due to its role in causing widespread tree mortality. This pest's cryptic behaviour has hindered research and control efforts, making laboratory rearing a valuable tool for studying its development and biology. We investigated the development period and biological characteristics of E. interjectus using artificial diets and fungal medium. Our findings revealed that the development time for eggs, larvae, and pupae averages approximately 6, 18, and 6 days, respectively. Notably, first and second instar larvae displayed peak moulting periods at 3.45 ± 0.64 SD and 7.92 ± 1.77 SD days, respectively. Furthermore, we measured head capsule widths of postmolt larvae, yielding values of 318.02 ± 7.38 SD μm for first-instar larvae, 403.01 ± 11.08 SD μm for second-instar larvae, and 549.54 ± 20.74 SD μm for third-instar larvae. Our research also uncovered a positive correlation between the number of progeny (eggs, larvae, pupae, and adults) and the mean length of the gallery system. Interestingly, the haplodiploid reproductive strategy did not significantly affect the number of offspring produced by the foundress. Additionally, we observed that foundresses displayed higher fecundity when subjected to nutrient-rich diets as compared to nutrient-poor diets. Our results will deepen our understanding of the biology of E. interjectus and provide criteria for larval instar classification. Additionally, managing nutrient availability within the colony could be considered a viable approach to regulating population size.

Keywords

ambrosia beetlehaplodiploid reproductionlarvae instarsproductivity
Type
Research Paper
Information
Bulletin of Entomological Research , First View , pp. 1 - 11
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Copyright
Copyright © The Author(s), 2024. Published by Cambridge University Press

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