Japanese Journal of Applied Entomology and Zoology
Online ISSN : 1347-6068
Print ISSN : 0021-4914
ISSN-L : 0021-4914
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Volume 55, Issue 1
Displaying 1-14 of 14 articles from this issue
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Regular Papers
  • Effects of Powdered Plant Material as an Ingredient of the Diet for Egg Collection and the Diet Preparation Method on Oviposition of the West Indian Sweetpotato Weevil, Euscepes postfasciatus (Coleoptera: Curculionidae)
    Takafumi Nakamura, Suguru Ohno, Kimiko Urasaki, Dai Haraguchi, Tsuguo ...
    Article type: Original Articles
    2011 Volume 55 Issue 1 Pages 1-8
    Published: February 25, 2011
    Released on J-STAGE: May 07, 2011
    DOIhttps://doi.org/10.1303/jjaez.2011.1
    JOURNAL FREE ACCESS
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    We examined the effects of powdered plant material as an ingredient of the artificial diet for egg collection, the dehydration method for preparing plant material (freeze or thermal dry), and timing of mixing the plant material in diet preparation procedure (pre- or post-heating) on the number of eggs obtained, adult survival rate, and egg hatchability of Euscepes postfasciatus, a serious pest of sweet potato (Ipomoea batatas). The type of plant material did not significantly affect the adult survival and hatchability but markedly affected the number of eggs obtained. Diets with the leaves and vines of the host plants of E. postfasciatus (sweet potato and a wild host, Ipomoea pes-caprae) realized twice the number of eggs than diets with the storage root of sweet potato, indicating an advantage of the former parts of Ipomoea plants as an ingredient of the diet for egg collection. The drying method for the plant parts and timing of mixing the plant material did not significantly affect the number of eggs obtained and other parameters, suggesting that some unknown factor(s) of leaves and vines inducing good oviposition of E. postfascuatus may be stable to heat treatment.
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  • Geographical Distribution and Host Crops of Bemisia tabaci (Gennadius) (Hemiptera: Aleyrodidae) Biotypes in Ryukyu Islands, Southwestern Japan
    Keisuke Kijima, Shigenori Ueda, Suguru Ohno, Tomoko Ganaha-Kikumura, K ...
    Article type: Original Articles
    2011 Volume 55 Issue 1 Pages 9-17
    Published: February 25, 2011
    Released on J-STAGE: May 07, 2011
    DOIhttps://doi.org/10.1303/jjaez.2011.9
    JOURNAL FREE ACCESS
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    Bemisia tabaci (Gennadius) (Hemiptera: Aleyrodidae) is one of the most economically important pests of agricultural crops worldwide. We determined the biotypes of B. tabaci collected from vegetables throughout the Ryukyu Islands (95 greenhouses and 55 open fields) from 2005 to 2009. B, Nauru and Q biotypes were found, among which Q was first confirmed to inhabit Ryukyu Islands in 2009. B biotype was identified in all greenhouses and 34 open fields. Q biotype was identified in only two bell pepper greenhouses and was not found in open fields. Nauru biotype was identified in two greenhouses and 28 open fields. B biotype was dominant in greenhouses, but the abundance of Nauru biotype in open fields was not very low compared to that of B biotype. Larvae of B biotype were found on all crops investigated except potato (12 families, 27 species), whereas the host range of the Nauru biotype was narrower (4 families, 6 species), with its occurrence strongly biased toward sweet potato. It is possible that the difference in biotype composition among the cultivation environments and host crops reflects the difference in ecological characteristics such as host preference and susceptibility to insecticides among the biotypes.
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Short Communications
  • A Case of Injury to Bell Pepper Fruit Caused by Flower Thrips Frankliniella intonsa (Trybom) (Thysanoptera: Thripidae)
    Keisuke Kijima, Tomoko Ganaha-Kikumura, Suguru Ohno
    Article type: Short Communications
    2011 Volume 55 Issue 1 Pages 19-22
    Published: February 25, 2011
    Released on J-STAGE: May 07, 2011
    DOIhttps://doi.org/10.1303/jjaez.2011.19
    JOURNAL FREE ACCESS
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    When flower thrips Frankliniella intonsa (Trybom) increased in February and April 2009 in a bell pepper greenhouse on Okinawa Island, southwestern Japan, we found a marked injury to the fruit skin that has not been reported to date. The characteristics of the fruit damage are described and illustrated. A large number of larvae of F. intonsa were observed in the damaged portions. The same damage was induced when larvae or adults were inoculated into the surface of bell pepper fruit under laboratory conditions. These results indicate that F. intonsa caused the injury. We must remain alert to possible expansion of this injury.
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  • Simplification of the Collecting Method of Adult Sweetpotato Weevils from Artificial Diets
    Takashi Kuriwada, Norikuni Kumano, Keiko Shiromoto, Dai Haraguchi
    Article type: Short Communications
    2011 Volume 55 Issue 1 Pages 22-24
    Published: February 25, 2011
    Released on J-STAGE: May 07, 2011
    DOIhttps://doi.org/10.1303/jjaez.2011.22
    JOURNAL FREE ACCESS
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    The West Indian sweetpotato weevil Euscepes postfasciatus (Fairmaire) (Coleoptera: Curculionidae) is a major pest of the sweet potato Ipomoea batatas (L.) Lam (Solanales: Convolvulaceae) in some countries. In order to improve the mass-rearing systems involved in an eradication program employing the sterile insect technique (SIT), we improved the efficiency of the method used for collecting adult weevils from artificial larval diets; this was done by using the combination of a sieve and Tullgren apparatus. Using this combination, we could collect 95.4% of weevils from artificial diets. Furthermore, the time spent in collection with this method was approximately one-fifth of that spent with the existing hand-sorting method. These results showed that this new collection method will improve the efficiency of mass rearing of West Indian sweetpotato weevils.
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Technical Notes
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