Emergence of less effective insecticidal populations of flower thrips, Frankliniella intonsa (Trybom) for spinosad in a strawberry greenhouse in Nara Prefecture

Abstract

We identified spinosad-resistant populations of Frankliniella intonsa (Trybom) in strawberry greenhouses in Nara city and Kashiba city. The mortality rate of the Kashiba population for spinosad commercial concentration was 6.5%, but that of the Nara population was 86.2%. This suggested that F. intonsa collected from strawberry in Nara Prefecture developed resistance to spinosad.