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Invasive fall armyworms are corn strain.

Karine Durand¹, Hyerin An¹, Kiwoong Nam²

¹DGIMI, Univ Montpellier, INRAE, Montpellier, France.

Scientific Reports

|March 8, 2024

Summary

The invasive fall armyworm (Spodoptera frugiperda) is the corn strain, not the rice strain. This finding is crucial for developing effective pest management strategies focusing on susceptible crops.

Keywords:

Spodoptera frugiperda Corn strain Fall armyworm Invasion Pest genomics

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Hyperactive piggyBac Transposase-mediated Germline Transformation in the Fall Armyworm, Spodoptera frugiperda

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Published on: September 23, 2021

Area of Science:

Entomology
Genomics
Invasive Species Biology

Background:

The fall armyworm (Spodoptera frugiperda) is a significant agricultural pest that has rapidly invaded new continents.
This pest exists as two strains, corn and rice, but their identity in invasive populations is unclear.

Purpose of the Study:

To identify the strain composition of invasive fall armyworm populations using population genomics.
To inform targeted pest management strategies for this destructive insect.

Main Methods:

Population genomics analyses were conducted on 116 globally collected samples.
Phylogenetic reconstruction and genetic similarity assessments were performed.

Main Results:

Invasive fall armyworms are genomically most similar to the corn strain.
Phylogenetic analysis supports an origin from the corn strain.
No evidence of gene flow from the rice strain to invasive populations was detected.

Conclusions:

Invasive fall armyworms predominantly belong to the corn strain.
The potential for invasive fall armyworms to infest rice crops is likely limited.
Pest management should prioritize crops typically affected by the corn strain.