Submitted to: Entomological Society of America Regional Meetings
Publication Type: Abstract Only
Publication Acceptance Date: 9/10/2008
Publication Date: 9/10/2008
Technical Abstract: Fall armyworm is a major pest of corn and a significant, but more sporadic, pest of cotton in the western hemisphere. Previous studies showed that the cotton infestations primarily involve a fall armyworm subpopulation known as the “corn-strain” for which corn is the preferred host plant. It was suggested that the fall armyworm infesting cotton originated in corn and spread into secondary hosts as their numbers increased. Consistent with this proposal was the finding that high positive correlations exist between corn acreage and fall armyworm infestation levels in cotton, and that these occurred between areas that are either geographically close or along plausible migration pathways. Formulae were derived from scatter plot and linear regression analysis that can predict infestation levels in cotton based on corn acreage, provided that the correlations exhibited in the most recent 10 years (1997-2006) are still relevant. The implications of these studies for describing and predicting fall armyworm population movements are discussed.