Japanese Journal of Applied Entomology and Zoology
Online ISSN : 1347-6068
Print ISSN : 0021-4914
ISSN-L : 0021-4914
Current issue
Displaying 1-12 of 12 articles from this issue
Original Articles
  • Daisuque Kitano
    2024 Volume 68 Issue 2 Pages 39-49
    Published: May 25, 2024
    Released on J-STAGE: June 21, 2024
    JOURNAL FREE ACCESS
    Supplementary material

    Onion thrips, Thrips tabaci Lindeman(Thysanoptera: Thripidae), is an important agricultural insect that infests a wide range of vegetables and fruits. To investigate the occurrence of thelytokous and arrhenotokous types of onion thrips and the effects of insecticides on them, we collected individuals from onion and Welsh onion fields in Shiga Prefecture, Japan. Of the 16 sampling sites, only thelytokous-type individuals were found at 12 sites, whereas arrhenotokous-type individuals co-habited four sites alongside the thelytokous type. Arrhenotokous-type individuals were subsequently eliminated from three sites, but they remained dominant at one site. The effects of insecticides(corrected mortality)were investigated using the leaf dipping method and a Bayesian model on five strains of the thelytokous type and one strain of the arrhenotokous type. The results showed that acephate(500 ppm), acetamiprid(100 ppm), spinetoram(48 ppm), fluxametamide(50 ppm), and flometoquin(100 ppm)were sufficiently toxic, and more than 70% corrected mortality at the lower limit was achieved for both the arrhenotokous and thelytokous types after 48 hours of exposure to these insecticides. The corrected mortality of cypermethrin(30 ppm)was over 90% at the lower limit for the thelytokous types but was 73.6% at the upper limit for the arrhenotokous type. The corrected mortality of pyridalyl(100 ppm)for the thelytokous types varied among the strains; it was over 70% in one strain and under 70% in four strains at the lower limit and less than 50% for the arrhenotokous type at the upper limit.

    Download PDF (765K)
  • Mizuho Kawabata, Ken Tabuchi, Tohru Ono, Hideto Yoshimura, Kenta Saito
    2024 Volume 68 Issue 2 Pages 51-58
    Published: May 25, 2024
    Released on J-STAGE: June 21, 2024
    JOURNAL FREE ACCESS
    Supplementary material

    Range expansion of the rice bug,Leptocorisa chinensisDallas(Hemiptera: Alydidae), has been reported on Northern Honshu Island for several years, and its damage is of concern in the newly expanding area. The average daily maximum temperature in early February is known to affect overwintering of the species in coniferous forests. To investigateL. chinensisdistribution and factors affecting its abundance, we set sticky traps in paddy fields from 2019 to 2022 in Miyagi Prefecture, where the range expansion of the species is suspected. The effects of(a)distance from the forest(total forest, coniferous forest, and Japanese cedar forest stand),(b)forest area surrounding the sticky trap, and(c)number of possible overwintering times over the last decade on the number ofL. chinensisadults captured by the sticky trap were analyzed. We established expansion in the distribution ofL. chinensisto the northern area of Miyagi Prefecture, where it had not previously been captured. Furthermore, the distance from the Japanese cedar forest stand and the number of possible overwintering times significantly affected the number ofL. chinensiscaptured.

    Download PDF (907K)
Short Communications
  • Kazunori Yamamoto, Sadahisa Yagi, Kazuhiro Nishikawa, Kei Tamura, Yusu ...
    2024 Volume 68 Issue 2 Pages 59-62
    Published: May 25, 2024
    Released on J-STAGE: June 21, 2024
    JOURNAL FREE ACCESS

    We discovered an egg batch of a moth species laid on the leaves of Ficus microcarpa(L.f)(Rosales: Moraceae)at Kyushu University. The larvae hatched from the eggs were fed on both F. microcarpa and Morus alba(L.)(Rosales: Moraceae). Mulberry latex is known to be toxic to most lepidopteran larvae, with the exception of a few, such as Bombyx mori(Linnaeus)(Lepidoptera: Bombycidae). However, to our surprise, the larvae developed normally, pupated, and emerged as fertile moths. We also investigated whether the larvae of the species fed on M. alba leaves and developed normally throughout the larval stage. Finally, we identified the species as Spodoptera litura(Fabricius)(Lepidoptera: Noctuidae)through observation of the external morphology of the moths and sequencing of the cytochrome oxidase I(COI)gene.

    Download PDF (687K)
  • Masayuki Hayashi
    2024 Volume 68 Issue 2 Pages 63-66
    Published: May 25, 2024
    Released on J-STAGE: June 21, 2024
    JOURNAL FREE ACCESS

    Conservation biological controls utilizing native natural enemies need to comprehend the natural enemy fauna in the area. While green lacewings(Neuroptera: Chrysopidae)are an important group of natural enemies in agriculture, their distribution remains unclear in Japan, particularly in the Nansei Islands. This study reports newly recorded green lacewing species found in the Nansei Islands, and summarizes the distribution information of lacewing species. Four species were newly recorded from the Amami Islands, 2 from the Okinawa Islands, 5 from the Miyako Islands, 2 from the Yaeyama Islands, and 4 from the Daito Islands. A total of 25 species of green lacewings were recognized including one species newly found in the Nansei Islands.

    Download PDF (333K)
feedback
Top