Toxicity of selective insecticides to Neochrysocharis formosa (Westwood) (Hymenoptera: Eulophidae), a parasitoid of the American serpentine leafminer Liriomyza trifolii (Burgess) (Diptera: Agrizomydae)

Dang Hoa Tran, Masami Takagi, Keiji Takasu

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Abstract

The susceptibilities of Neochrysocharis formosa, a larval parasitoid of the American serpentine leafminer Liriomyza trifolii, to three insecticides (imidacloprid, pymetrozine and lufenuron) were investigated in the laboratory. Individual parasitoids were placed in the grass vials whose internal surface was coated with the insecticides. For 24 h exposure, the LC 50 values were 0.033 μg/0.5 ml for imidacloprid, 75.57 μg/0.5 ml for pymetrozine and 0.417 μℓ/0.5ml for lufenuron. For imidacloprid and lufenuron, these values were 775.5 and 14.9 times lower than the recommended concentrations, respectively. Even in the concentrations lower than the LC 50, parasitoid survival rapidly decreased with time, and the longevity of parasitoid females was also reduced. These results suggested that all of imidacloprid, pymetrozine and lufenuron were harmful to N. formosa.

Original languageEnglish
Pages (from-to)109-118
Number of pages10
JournalJournal of the Faculty of Agriculture, Kyushu University
Volume50
Issue number1
Publication statusPublished - Feb 2005

All Science Journal Classification (ASJC) codes

  • Agricultural and Biological Sciences (miscellaneous)

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