title: Acaricidal activities of materials derived from Pyrus ussuriensis fruits against stored food mites.
abstract: The acaricidal activities of materials derived from Pyrus ussuriensis fruits were evaluated against Tyrophagus putrescentiae and compared with that of commercial acaricide (benzyl benzoate). On the basis of the 50 % lethal dose (LD(50)) values, the ethyl acetate fraction of the fractions obtained from an aqueous extract of P. ussuriensis fruits had the highest acaricidal activity (16.32 μg/cm(2)) against T. putrescentiae. The acaricidal constituent of P. ussuriensis fruits was isolated by chromatographic techniques and identified as 1,4-benzoquinone. On the basis of the LD(50) values, 1,4-benzoquinone (1.98 μg/cm(2)) was 5.9 times more toxic than benzyl benzoate (11.69 μg/cm(2)), followed by 2-isopropyl-5-methyl-1,4-benzoquinone (3.29 μg/cm(2)), and 2,3-dimethoxy-5-methyl-1,4-benzoquinone (5.03 μg/cm(2)) against T. putrescentiae in the fumigant bioassay. In a filter paper bioassay, the acaricidal activity of 1,4-benzoquinone (0.07 μg/cm(2)) was 120.1 times more effective than that of benzyl benzoate (8.41 μg/cm(2)), followed by 2-isopropyl-5-methyl-1,4-benzoquinone (0.11 μg/cm(2)) and 2,3-dimethoxy-5-methyl-1,4-benzoquinone (0.30 μg/cm(2)) against T. putrescentiae. These results demonstrate that P. ussuriensis fruit-derived material and its derivatives have potential as new preventive agents for the control of stored food mites.
authors.affiliation: Department of Bioenvironmental Chemistry and Institute of Agricultural Science and Technology, College of Agriculture and Life Sciences, Chonbuk National University, Jeonju 561-756, South Korea.
authors.forename: Ju-Hyun
authors.initials: JH
authors.lastname: Jeon
authors.forename: Ji-Yeon
authors.initials: JY
authors.lastname: Yang
authors.forename: Hoi-Seon
authors.initials: HS
authors.lastname: Lee
mesh_terms: D056810:Acaricides / Q000494:pharmacology*; D000818:Animals; D005506:Food Contamination / Q000032:analysis / Q000517:prevention & control*; D005516:Food Microbiology; D005519:Food Preservation / Q000379:methods; D005638:Fruit; D007928:Lethal Dose 50; D008925:Mites / Q000187:drug effects* / Q000254:growth & development; D010572:Pest Control, Biological / Q000379:methods; D010936:Plant Extracts / Q000494:pharmacology*; D031989:Pyrus / Q000737:chemistry*
chemical_list: D056810:Acaricides; D010936:Plant Extracts