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2013年50 No.2
Responses of the predatory mite Neoseiulus cucumeris to life stages and secretions of Diaphorina citri
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Key Words：predatory mite, Diaphorina citri, Neoseiulus cucumeirs, attraction response
Abstract：
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Movements of the predatory mite Neoseiulus cucumeris (Oudemans) toward different life stages and secretions of Diaphorina
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citri Kuwayama were investigated an open environment,simulating natural conditions. The response of adult female N.
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cucumeris to different life stages of D. citri and to the secretions of D. citri on Murraya panicuata shoots was studied
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using choice tests at 25℃. The results were：1. Female N. cucumeris showed a significant response to mixed life stages of
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D. citri after two hours and a highly significant response after three hours,indicating that the response to mixed life
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stages of D. citri is very strong. 2. Female N. cucumersi were not attracted to D.citri eggs. 3. Hourly counts of the
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numbers of female N. cucumeris on shoots with young D. citri nymphs in the first five hours of the experiment were, 25
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00%,1833%,1333%,1500% and 2333% higher,respectively,than those on control shoots without D. citri nymphs. 4. The
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response of predators to old D. citri nymphs was highest at the end of the first hour of the experiment and lowest during
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the second and third hours. The proportion of predators began to rebound during the fourth hour and had increased to
5167% by the end of fifth hour. This shows that old D. citri nymphs are attractive to N. cucumeris. 5. In trials using
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secretions of D.citri,the number of predators on shoots with secretions was 3333% higher than on control shoots,one hour
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after the start of the experiment. At the end of two hours,the proportion of predators departing the treatment shoot had
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increased but the number on treatment shoots remained higher than on control shoots. This result shows that females of N.
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cucumersi are attracted to secretions of D.citri.
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