title: Changes in genotypic composition of Myzus persicae (Hemiptera: Aphididae) on tobacco during the past two decades in Japan.
abstract: Ninety-nine and 476 clones of Myzus persicae (Sulzer) were sampled on tobacco at Kyoto (Shimogamo) (1996-2000) and at 23 other localities (1998-1999) in Japan, respectively. The clones were classified into colour-esterase forms, distinguished by combinations of body colour and electrophoretically detectable esterases, to verify the changes in genotypic composition during the past two decades. Fifteen and 31 colour-esterase forms were found at Kyoto (Shimogamo) and at 23 other localities, respectively. Fourteen (representing c. 95% of the total clones sampled) and 24 (c. 44%) colour-esterase forms, respectively, were different from those found on tobacco during 1978-1985. The frequency of the green form and the very highly insecticide-resistant form increased. More than half of the colour-esterase forms found in the present survey were newly detected. The factors associated with these changes are discussed.
authors.affiliation: Laboratory of Applied Entomology, Graduate School of Agriculture, Kyoto Prefectural University, Shimogamo, Kyoto 606-8522, Japan. a9720607@kpu.ac.jp
authors.forename: T
authors.initials: T
authors.lastname: Shigehara
authors.forename: H
authors.initials: H
authors.lastname: Takada
mesh_terms: D000222:Adaptation, Physiological; D000818:Animals; D001042:Aphids / Q000201:enzymology / Q000235:genetics* / Q000502:physiology*; D003001:Cloning, Molecular; D004950:Esterases / Q000235:genetics; D005260:Female; D005838:Genotype; D007305:Insecticide Resistance / Q000235:genetics; D007564:Japan; D008297:Male; D010802:Phylogeny; D014026:Nicotiana / Q000469:parasitology*
chemical_list: D004950:Esterases