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The Cellular Immunological Responses and Developmental Differences between Two Hosts Parasitized by Asecodes

Zhiming Chen^1,2,3,4, Tingting Fu^1,3,4, Lang Fu^1,3,4

¹State Key Laboratory of Ecological Pest Control for Fujian and Taiwan Crops, Fujian Agriculture and Forestry University, Fuzhou 350002, China.

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Summary

Asecodes hispinarum parasitism successfully develops in Brontispa longissima larvae, causing high mortality. However, Octodonta nipae larvae mount an immune response, preventing A. hispinarum development and increasing hemocyte counts.

Keywords:

Asecodes hispinarum Brontispa longissima Octodonta nipae cellular immune developmental interactions hemocytes

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Area of Science:

Entomology
Insect Pathology
Immunology

Background:

Brontispa longissima and Octodonta nipae are significant agricultural pests.
Asecodes hispinarum is a parasitoid wasp with potential for biological control.

Purpose of the Study:

Investigate Asecodes hispinarum developmental interactions with B. longissima and O. nipae.
Analyze cellular immune responses of B. longissima and O. nipae larvae to A. hispinarum parasitism.
Determine reasons for differential larval breeding success of A. hispinarum in these hosts.

Main Methods:

Comparative parasitism assays on B. longissima and O. nipae larvae.
Larval development, hemocyte counts, and hemocyte composition analysis.
Statistical analysis and anatomical imaging.

Main Results:

A. hispinarum parasitism led to 98.88% mortality in B. longissima larvae with successful development.
O. nipae larvae exhibited high encapsulation rates (99.05%) and prevented A. hispinarum development.
Parasitism increased hemocyte counts and altered hemocyte proportions in both hosts, with more pronounced immune responses in O. nipae.

Conclusions:

A. hispinarum cannot successfully reproduce in O. nipae due to robust host immune responses.
Differential hemocyte counts and composition are key factors in O. nipae's successful encapsulation of A. hispinarum.
A. hispinarum parasitism adversely affects O. nipae larval development despite reproductive failure.