Japanese Journal of Applied Entomology and Zoology
Online ISSN : 1347-6068
Print ISSN : 0021-4914
ISSN-L : 0021-4914
Search
Advanced search
OR
Browse
Search
Volume 66, Issue 1
Displaying 1-11 of 11 articles from this issue
Show all abstracts
    • |<
    • <
    • 1
    • >
    • >|
Original Articles
  • Effect of Light on the Activity Rhythm of Adult Soybean Pod Borer, Leguminivora glycinivorella（Lepidoptera: Tortricidae）
    Miki Saito
    2022 Volume 66 Issue 1 Pages 1-11
    Published: February 25, 2022
    Released on J-STAGE: March 01, 2022
    DOIhttps://doi.org/10.1303/jjaez.2022.1
    JOURNAL FREE ACCESS
    Show abstractHide abstract

    The locomotor activity of unmated adult Leguminivora glycinivorella（Matsumura）（Lepidoptera: Tortricidae）immediately after emergence was recorded under various photoperiods using an actograph in an incubator. Under a 12L : 12D photoperiod, both sexes displayed an approximately 24-hour cycle rhythm consisting of active and resting periods. Activity was observed around switching from the light to dark period. Under constant dark conditions, rhythms similar to those in the 12L : 12D photoperiod were observed, indicating that the activity is controlled by a circadian clock. The activity phase receded as the beginning of constant darkness was delayed, and the beginning of constant darkness was almost coincident with the median of activity, suggesting that the light stimulus that switches from light to dark is a zeitgebers of the circadian clock. Under constant light conditions, three out of five males and two out of five females were found to have lost their periodicity. Even in the individuals that showed periodicity, there was a significant decrease in 24-hour activity in males and a loss of rhythm after the second day of emergence in females, suggesting that constant light conditions disrupt the circadian clock. Artificial light irradiation at night may suppress mating behavior in soybean fields, leading to damage suppression.

    View full abstract
    Download PDF (1129K)
  • Risk of Damage to Plants in the Family Gramineae at Various Growth Stages from the 2019 Invasion of the Fall Armyworm, Spodoptera frugiperda（Lepidoptera: Noctuidae）, in Kagoshima, Japan
    Kazuki Kakimoto, Sachiyo Sanada
    2022 Volume 66 Issue 1 Pages 13-18
    Published: February 25, 2022
    Released on J-STAGE: March 01, 2022
    DOIhttps://doi.org/10.1303/jjaez.2022.13
    JOURNAL FREE ACCESS
    Show abstractHide abstract

    The fall armyworm, Spodoptera frugiperda（J. E. Smith）（Lepidoptera: Noctuidae）, invaded Kagoshima, Japan, in July 2019. This moth is a dangerous pest of grain crops including corn and sorghum in regions including the US, Africa, Australia, and Asia（e.g., China and India）. We evaluated the risk of damage posed by the fall armyworm to different species in the family Gramineae at various growth stages in 2019. The moth larval densities and damage caused were higher in forage maize, Zea mays（L.）, and sweet corn, Z. mays（L.）var. saccharata, compared to Sorghum bicolor（L.）Moench. Furthermore, we clarified that the moth species is likely to prefer young corn plants.

    View full abstract
    Download PDF (2092K)
    • |<
    • <
    • 1
    • >
    • >|
feedback
 Top