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Evidence of Leaf Consumption Rate Decrease in Fall Armyworm, Spodoptera frugiperda, Larvae Parasitized by Coccygidium

Lakpo Koku Agboyi1, Samuel Adjei Mensah1, Victor Attuquaye Clottey1

  • 1Centre for Agriculture and Bioscience International (CABI), P.O. Box CT 8630, Cantonments, Accra GA 0376800, Ghana.

Insects
|November 21, 2019
PubMed
Summary

The parasitoid wasp Coccygidium luteum significantly reduces the leaf consumption of the invasive fall armyworm (Spodoptera frugiperda) by 89%. This finding highlights C. luteum as a potential biological control agent for maize pests in Africa.

Keywords:
Coccygidium luteumSpodoptera frugiperdabiological controlendoparasitoidfall armywormfeedingmaize

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Area of Science:

  • Agricultural Entomology
  • Biological Control
  • Insect Ecology

Background:

  • The invasive fall armyworm (Spodoptera frugiperda) poses a significant threat to maize production in Africa.
  • Biological control using native natural enemies is a sustainable strategy for managing Spodoptera frugiperda.
  • Limited knowledge exists on the efficacy of native natural enemies for integrated pest management of this invasive pest.

Purpose of the Study:

  • To assess the impact of the endoparasitoid wasp Coccygidium luteum on the feeding behavior of Spodoptera frugiperda.
  • To quantify the reduction in maize leaf consumption by Spodoptera frugiperda larvae parasitized by C. luteum.

Main Methods:

  • Laboratory assessment of leaf consumption rates in parasitized versus unparasitized Spodoptera frugiperda larvae.
  • Exposure of 50 first instar Spodoptera frugiperda larvae to Coccygidium luteum for oviposition.
  • Comparison of maize leaf consumption between parasitized and unparasitized larvae from the same cohort.

Main Results:

  • Coccygidium luteum completed its life cycle in 16.7 days under laboratory conditions.
  • Parasitized Spodoptera frugiperda larvae exhibited a gradual decline in leaf consumption rate.
  • Overall reduction in maize leaf consumption by parasitized larvae reached 89%.

Conclusions:

  • Coccygidium luteum demonstrates potential for reducing damage caused by Spodoptera frugiperda in maize farms.
  • Further research is required to evaluate field parasitism rates and develop cost-effective mass production for biological control programs.