Invasive Species Compendium

Detailed coverage of invasive species threatening livelihoods and the environment worldwide

Abstract

A note on the presence in Catalonia of a parasitic system bound to the tachinid fly Lydella thompsoni Herting, a parasitoid of corn borers.

Abstract

In Spain, Lydella thompsoni is one of the most frequent parasitoids of Sesamia nonagrioides and Ostrinia nubilalis, both pests of maize. The abundance of the population of L. thompsoni in maize fields depends, among other factors, on the possibility of the tachinid achieving its first generation in spring on hosts other than corn borers, because these are not available to be parasitized at that time. In some areas of Europe, spring hosts of the tachinid are noctuids feeding on Gramineae in wetlands. This type of system could also be identified in the north, south and west of Catalonia. It should be noted that a high percentage of parasitization by the tachinid was recorded in western Catalonia where maize has only recently become established and where there are fewer wetlands than in the other two areas.