Japanese Journal of Grassland Science
Online ISSN : 2188-6555
Print ISSN : 0447-5933
ISSN-L : 0447-5933
Volume 67, Issue 4
Displaying 1-10 of 10 articles from this issue
Research Paper
  • Genki Ishigaki, Sachiko Idota, Yasuyuki Ishii
    2022 Volume 67 Issue 4 Pages 183-188
    Published: April 25, 2022
    Released on J-STAGE: November 30, 2022

    To clarify a basic knowledge on pesticide application methods against fall armyworm (Spodoptera frugiperda), we investigated the spraying percentage of droplets on leaves and ears covered by water-sensitive paper using several pesticide-spraying methods, including tractor-mounted boom sprayers, handheld electrostatic sprayer, and drone-spraying at various growth stages of maize (Zea mays). In boom spraying methods, the spraying percentages of droplets under the sprayed rate of 200 L per 10 a at the 1st-2nd leaf stage was over than 98%. In the case of 100 L per 10 a at the 5-6th leaf stage, they were less than 50%. For the tractor-mounted boom sprayer, spraying percentages of droplets at the top- and middle-leaves in the 9-10th leaves stage were lower than those at the lower-leaves. On the other hand, the electrostatic sprayer exhibited the opposite results. In drone-spraying at the dough-ripe maize, they were obtained more than 60% in base and middle part of upper- and middle-leaves under the amount of 100 L per 10 a. These results elucidate important information that contributes to our basic knowledge on the selection of pesticide application methods against fall armyworm. It will be necessary to clarify the relationship between the spraying percentage of droplets and the control/exterminating effect.

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Research Information