Abstract
Abstract The black pine bast scale, Matsucoccus thunbergianae is one of the most serious insect pest inJapanese black pine, Pinus thunbergii forest in Korea. Insecticidal activity of 10 folds hot water extracts from7 herbal plants (Atractylodes lancea, Eugenia caryophyllata, Lonicera japonica, Melia azedarach, Quisqualisindica, Sophora flavescens and Taraxacum mongolicum) were tested against different stage of M.thunbergianae using spray method both in laboratory and field. Efficacies of herbal extracts were differentdepending on stage of M. thunbergianae. Q. indica sprayed with hand sprayer produced the highest correctedmortality of 95.7% on intermidiated nymph stage, however, A. lancea produced the highest correctedmortality (51.3%) on pupae of M. thunbergianae in laboratory. Q. indica and A. lancea were highly effectiveagainst female M. thunbergianae in laboratory, however, corrected mortality was lower than other stage(40.0%). Efficacy of Q. indica was similar to effective insecticide, fenitrothion 50% EC against M.thunbergianae in field trials. These results indicated that Q. indica could be an environmental friendly controlagent of M. thunbergianae. Key words Black pine bast scale, Environmental friendly control, Plant extracts, Quisqualis indica
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