Sudo Masaaki official site
For the reinstatement of
population ecology.

SUDO Masaaki PhD
Division of Fruit Tree and Tea Pest Control Research, Institute for Plant Protection, NARO, JAPAN

About me

Sudo portrait

ORCID ID 0000-0001-9834-9857

Google Scholar




A pitiful man, who used to count mites day after day.


2021.04.01 Organizational changes of NARO.
2017.09.17 New paper added: Sudo et al. (in press) Evol Appl.
2017.04.01 I moved to Kanaya Tea Research Station.
2015.08.12 New paper added: Sudo and Osakabe (in press) Env. Entomol.
2014.06.15 Hired as a post-doc in Tsukuba
2014.03.24 Ph.D. from the Graduate School of Agriculture, Kyoto University, Japan
2013.04.24 Our new paper on mite geotaxes is finally released from the Kyoto University repository!
2013.03.14 New paper added
2012.11.05 New paper added
2012.10.12 New paper added
2012.08.05 Modified
2012.06.25 Modified
2012.06.10 Modified
2012.05.30 Modified
2012.05.15 OPEN

The heartwarming story of the month

I know about a girl who sold her little brother down the river to get a piece of bread. Once she asked me,
"Did I make a wrong choice?"
I answered,
"Don't take it to heart. The worth of your life is equal to the one of your little brother--to wit, your life and a piece of bread is worth more than the life of your brother."
What I spoke seemed to put her fears to rest.

KABURI: a phytoseiid mite 2D action game.
Old Flash version

Home | English page


Population ecology; Plant mites; Leaf-surface microstructure; Environmental stress; Prey–predator interaction; Applied statistics; Applied evolutionary biology; Pesticide resistance management; Numerical simulation; Tea pest control;

Educational background

Mar 2007Bachelor of Integrated Human Studies, Kyoto University, Japan
Mar 2009Master of Human and Environmental Studies, Kyoto University, Japan
Mar 2014Ph.D. from the Graduate School of Agriculture, Kyoto University, Japan


Apr 2011–Mar 2013JSPS research fellow DC2
June 2014–Mar 2017Post-doc fellow in NIAES (2016-- integrated into NARO)
Apr 2017–Mar 2020Fixed-term researcher in NARO
Apr 2020–PresentSenior scientist in NARO


Mar 2020The Japanese Society of Applied Entomology and ZoologyIncentive Award for Young Researchers.


Refereed Journals

*: as a corresponding author

  1. *Masaaki Sudo, Sachiko Nishida, Takao Itioka (2010) Seasonal fluctuations in foliar mite populations on Viburnum erosum Thunb. var. punctatum Franch. et Sav. (Adoxaceae) and sympatric shrubs in temperate secondary forests in western Japan. Applied Entomology and Zoology 45 (3): 405–415. doi: 10.1303/aez.2010.405
  2. *Masaaki Sudo, Masahiro Osakabe (2011) Do plant mites commonly prefer the underside of leaves? Experimental and Applied Acarology 55 (1): 25–38. doi: 10.1007/s10493-011-9454-4 | Also available from the Kyoto University repository.
  3. Yuta Sakai, Masaaki Sudo, *Masahiro Osakabe (2012) Seasonal changes in the deleterious effects of solar ultraviolet-B radiation on eggs of the twospotted spider mite, Tetranychus urticae (Acari: Tetranychidae). Applied Entomology and Zoology 47 (1): 67–73. doi: 10.1007/s13355-011-0090-6
  4. Yuta Sakai, *Masaaki Sudo, Masahiro Osakabe (2012) A comparison of the effects of gravity and the nutritional advantage of leaf surfaces on fecundity in the two-spotted spider mite (Acari: Tetranychidae). Journal of the Acarological Society of Japan 21 (1): 1–6. doi: 10.2300/acari.21.1
  5. *Masaaki Sudo, Masahiro Osakabe (2013) Geotaxis and leaf-surface preferences mitigate negative effects of a predatory mite on an herbivorous mite. Experimental and Applied Acarology 59 (4): 409–420. doi: 10.1007/s10493-012-9622-1 | Also available from the Kyoto University repository.
  6. Midori Fukaya, Ryuji Uesugi, Hirokazu Ohashi, Yuta Sakai, Masaaki Sudo, Atsushi Kasai, Hidenari Kishimoto, *Masahiro Osakabe (2013) Tolerance to solar ultraviolet-B radiation in the citrus red mite, an upper surface user of host plant leaves. Photochemistry and Photobiology 89: 424–431. doi: 10.1111/php.12001
  7. *Masaaki Sudo, Masahiro Osakabe (2013) Stellate hairs on leaves of a deciduous shrub Viburnum erosum var. punctatum (Adoxaceae) effectively protect Brevipalpus obovatus (Acari: Tenuipalpidae) eggs from the predator Phytoseius nipponicus (Acari: Phytoseiidae). Experimental and Applied Acarology 60: 299–311. doi: 10.1007/s10493-012-9648-4 | Also available from the Kyoto University repository.
  8. *Otani Y, Yoshihiro S, Takahata Y, Zamma K, Nagai M. Kanie M, Hayaishi S, Fujino M, Sugaya K, Sudo M, Amanai S, Kaneda M, Tachikawa Y, Fukunaga Y, Okahisa Y, Higashi K, Hanya G (2013) Density of Japanese macaque (Macaca fuscata yakui) males ranging alone: seasonal and regional variation in male cohesiveness with the group. Mammal Study 38: 105–115.
  9. *Masaaki Sudo, Masahiro Osakabe (2015) Joint effect of solar UVB and heat stress on the seasonal change of egg hatching success in the herbivorous false spider mite (Acari: Tenuipalpidae). Environmental Entomology 44 (6): 1605–1613. doi: 10.1093/ee/nvv131
  10. *Daisuke Takahashi, Takehiko Yamanaka, Masaaki Sudo, David A. Andow (2017) Is a larger refuge always better? Dispersal and dose in pesticide resistance evolution. Evolution 71 (6): 1494–1503. doi: 10.1111/evo.13255 Open Access
  11. *Masaaki Sudo, Daisuke Takahashi, David A. Andow, Yoshito Suzuki, Takehiko Yamanaka (2018) Optimal management strategy of insecticide resistance under various insect life histories: heterogeneous timing of selection and inter-patch dispersal. Evolutionary Applications 11 (2): 271–283. doi:10.1111/eva.12550 Open Access.
    Press release from NARO (Nov. 14, 2017) Simulation models for evaluation of optimal pesticide management strategy.
  12. *Dagmar Voigt, Pablo Perez Godwyn, Masaaki Sudo, Kenji Fujisaki, Michael Varenberg (2019) Gripping ease in southern green stink bugs Nezara viridula L. (Heteroptera: Pentatomidae): coping with geometry, orientation and surface wettability of substrate. Entomological Science 22 (1): 105–118. doi:10.1111/ens.12345 Open Access
  13. *Masaaki Sudo, Atsushi Kasai, Yasuhshi Sato, Hiroshi Yorozuya (2019) Pesticidal activities of neonicotinoids and diamides on adult yellowish elongate chafer, Heptophylla picea Motschulsky, in various application forms and under equipmental/environmental conditions. Tea Research Journal 127: 11–18. (in Japanese)
  14. *Masaaki Sudo, Takehiko Yamanaka, Shun’ichi Miyai (2019) Quantifying pesticide efficacy from multiple field trials. Population Ecology 61 (4): 450–456. doi:10.1002/1438-390X.12019 (Open Access) | (PDF version)
  15. Masaaki Sudo, *Kohji Yamamura, Shoji Sonoda, Takehiko Yamanaka (2021) Estimating the proportion of resistance alleles from bulk Sanger sequencing, circumventing the variability of individual DNA. Journal of Pesticide Science 46(2): 1–8. doi:10.1584/jpestics.D20-064 (Open Access: CC BY-NC-ND 4.0 License) | (Source code)
  16. *Masaaki Sudo, Yasushi Sato, Hiroshi Yorozuya (2021) Time-course in attractiveness of pheromone lure on the smaller tea tortrix moth: a generalized additive mixed model approach. Ecological Research 36(4): 603–616. doi:10.1111/1440-1703.12220 (published online 30 Mar. 2021) | Preprint is available at BioRxiv (v2: January 18, 2021) (v1: November 08, 2020). | Raw trap data of the tortrix moth is available on Figshare.
  17. *Hiroshi Yorozuya, Masaaki Sudo, Yasushi Sato (2021) Field evaluation of resistance to tea green leafhopper, Empoasca onukii, in tea plant. Entomologia Experimentalis et Applicata 169 (11): 1049–1056. doi:10.1111/eea.13096
  18. *Masaaki Sudo, Masahiro Osakabe (2021) freqpcr: Estimation of population allele frequency using qPCR ΔΔCq measures from bulk samples. Molecular Ecology Resources. doi:10.1111/1755-0998.13554 (published online 09 Dec. 2021) (Open Access: CC BY 4.0 License) | Preprint is available at BioRxiv (v2: February 16, 2021) (v1: January 20, 2021). | Source code (GitHub) | Simulation output (Figshare)
  19. *Takehiko Yamanaka, Satoshi Kitabayashi, Akiya Jouraku, Hiroyuki Kanamori, Seigo Kuwazaki, Masaaki Sudo (2022) A feasibility trial of genomics-based diagnosis detecting insecticide resistance of the diamondback moth. Pest Management Science 78 (4): 1573–1581. doi:10.1002/ps.6776
  20. *Misono Tadatsu, Ryota Sakashita, Rafaela Panteleri, Vassilis Douris, John Vontas, Yushi Shimotsuma, Tatsuya Ishida, Masaaki Sudo, Thomas Van Leeuwen, Masahiro Osakabe (2022) A mutation in chitin synthase I associated with etoxazole resistance in the citrus red mite Panonychus citri (Acari: Tetranychidae) and its uneven geographical distribution in Japan. Pest Management Science xx (x): xx–xx. doi:10.1002/ps.7021

Presentation (international)

* as a speaker

Poster sessions

  1. *Masaaki Sudo, Sachiko Nishida, Takao Itioka (2008.10.09) The rich acarofauna on Viburnum erosum var. punctatum. International Symposium on Mites & Whitefly (P011). Daemyung Resort, Gyeongju, KOREA
  2. *Masaaki Sudo, Masahiro Osakabe (2012.03.19) Discrepancy between predator density and shelter availability: why false spider mites oviposit on less hairy surface of a leaf? The 5th EAFES International Congress (P1-236A#). Ryukoku University, Otsu, JAPAN
  3. *Masaaki Sudo, Daisuke Takahashi, Yoshito Suzuki, David A. Andow, Takehiko Yamanaka (2015.11.18) Insecticide-resistance management for various insect lifehistories: Is a mixture strategy always the best choice? 2015 Annual Meeting, Entomological Society of America (D3435). Minneapolis Convention Center, Minneapolis, MN, US
  4. *Takehiko Yamanaka, Satoshi Kitabayashi, Masaaki Sudo, Atsushi Yamamoto (2018.11.14) Descriptive simulation model of diamondback moth for the pesticide resistance management. The 2018 ESA, ESC, and ESBC Joint Annual Meeting. Poster: SysEB, Social Insects and Other (D3626). Vancouver Convention Center, BC Canada

Oral presentations

  1. *Masaaki Sudo, Masahiro Osakabe (2012.07.11) How environmental heterogeneity between leaf surfaces affects spatial distribution and prey-predator interaction in plant mites. 7th Symposium of the EURopean Association of Acarologists (Session Behavioral Ecology and Life History EH01). Vienna, AUSTRIA
  2. *Masaaki Sudo, Masahiro Osakabe (2014.07.15) Solar radiation as a determinant of acarine community assembly and seasonal dynamics. XIV International Congress of Acarology (Symposium "Mites under the sun: how radiant heat, visible light or ultraviolet affect mite physiology, life history and community ecology?" S3-05-7). Kyoto Terrsa, Kyoto, JAPAN
  3. *Masaaki Sudo, Kohji Yamamura, Takehiko Yamanaka, Daisuke Takahashi (2018.11.11) Mechanisms of resistance evolution under spatially heterogeneous selection pressure: An explicit dose-response model approach. The 2018 ESA, ESC, and ESBC Joint Annual Meeting (Session 10-min: SysEB, Invasive Species and Biological Control 0790). Vancouver Convention Center, BC Canada


SUDO Masaaki

Kanaya Tea Research Station, NARO
2769 Shishidoi, Kanaya, Shimada, Shizuoka 428-8501, Japan

E-mail: "masaaki" + at + ""