日本応用動物昆虫学会誌
Online ISSN : 1347-6068
Print ISSN : 0021-4914
ISSN-L : 0021-4914
最新号
選択された号の論文の12件中1~12を表示しています
原著
  • 北野 大輔
    2024 年 68 巻 2 号 p. 39-49
    発行日: 2024/05/25
    公開日: 2024/06/21
    ジャーナル フリー
    電子付録

    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.

  • 川端 泉穂, 田渕 研, 小野 亨, 吉村 英翔, 齋藤 健多
    2024 年 68 巻 2 号 p. 51-58
    発行日: 2024/05/25
    公開日: 2024/06/21
    ジャーナル フリー
    電子付録

    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.

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