Tadafumi Nakata

Japan International Research Center for Agricultural Sciences, Tsukuba, Ibaraki, Japan

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Publications (2)1.34 Total impact

  • Source
    Youichi Kobori · Tadafumi Nakata · Yasuo Ohto · Fugo Takasu ·
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    ABSTRACT: Artificial release of marked adult Diaphorina citri, the insect vector of citrus greening disease, was performed in July 2007 (10,000 adults released, experiment 1) and October 2008 (1,000 adults released, experiment 2) to determine the association of the dispersal pattern with disease invasion risk. During the experimental periods, in experiment 1, the mean dispersal distances from the release point were 5–6m and in experiment 2 they were 6–12m. Further examination of the relationship between dispersal distance and season is needed. The number of released D. citri declined with increasing distance from the release point and did not change markedly with time. The center of distribution moved little during the experimental period. These results suggest that the adult D. citri barely moved once they had colonized a host plant within a few days after their release. Our results also suggest that the released D. citri moved with the wind. The diffusion coefficient was estimated at 7.23 from experiment 1, but random diffusion might be a poor descriptor of the dispersal of adult D. citri. KeywordsHuanglongbing–Psyllid vector–Citrus orchard–Risk management–Epidemiology
    Applied Entomology and Zoology 02/2011; 46(1):27-30. DOI:10.1007/s13355-010-0004-z · 1.14 Impact Factor
  • Youichi Kobori · Tadafumi Nakata · Yasuo Ohto ·
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    ABSTRACT: The Asian citrus psyllid Diaphorina citri is an important vector of citrus greening disease (Huanglongbing). We investigated its dispersal pattern on Citrus depressa by no-choice and choice tests to determine the risk of the spread of Huanglongbing. D. citri began to disperse from a released tree to another tree 4-5 d after adult emergence. The dispersal movement of adults was more active on trees with newly developing buds. Choice testing between trees with and without buds revealed that released adults preferred trees with buds over the 2 d test period. This preference disappeared when both trees were treated with a sticky spray to prevent adult movement between trees. These results suggest that adult D. citri do not select trees with new buds from a distance but recognize them by random movement between trees.
    Japanese Journal of Applied Entomology and Zoology 01/2011; 55(3):177-181. DOI:10.1303/jjaez.2011.177 · 0.20 Impact Factor