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Fumigant toxicity of basil oil compounds and related compounds to Thrips palmi and Orius strigicollis
Author(s) -
Kim KwangHo,
Yi ChangGeun,
Ahn YoungJoon,
Kim Soon Il,
Lee SangGuei,
Kim JunRan
Publication year - 2015
Publication title -
pest management science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.296
H-Index - 125
eISSN - 1526-4998
pISSN - 1526-498X
DOI - 10.1002/ps.3925
Subject(s) - dichlorvos , toxicology , basilicum , menthone , toxicity , pulegone , eugenol , essential oil , chemistry , biology , botany , pesticide , agronomy , organic chemistry
BACKGROUND This study was aimed at assessing the fumigant toxicity to adult Thrips palmi (a serious insect pest) and Orius strigicollis (a beneficial predator insect) of basil ( Ocimum basilicum ) essential oil compounds and structurally related compounds using vapour‐phase toxicity bioassays. RESULTS Against adult T . palmi , linalool ( LD 50 0.0055 mg cm −3 ) was the most toxic fumigant and was 15.2‐fold more effective than dichlorvos (0.0837 mg cm −3 ). Strong fumigant toxicity was also observed in pulegone (0.0095 mg cm −3 ), (±)‐camphor (0.0097 mg cm −3 ) and 1,8‐cineole (0.0167 mg cm −3 ). Moderate toxicity was produced by camphene, 3‐carene, (−)‐menthone, (+)‐ α ‐pinene, (+)‐ β ‐pinene, α ‐terpineol and (−)‐ α ‐thujone (0.0215–0.0388 mg cm −3 ). Against adult O. strigicollis , dichlorvos ( LD 50 9.0 × 10 −10 mg cm −3 ) was the most toxic fumigant, whereas the LD 50 values of these compounds ranged from 0.0127 to >0.23 mg cm −3 . Based upon the selective toxicity ratio, the compounds described are more selective than dichlorvos. CONCLUSION The basil oil compounds described merit further study as potential insecticides for control of T. palmi in greenhouses because of their generally lower toxicity to O. strigicollis and their greater activity as a fumigant than dichlorvos. © 2014 Society of Chemical Industry