Agricultural and Forest Entomology (2016) 18, 157-166

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Katsuya Ichinose, Keiji Yasuda, Nobuo Yamashita, Masaya Matsumura and Yoshihiro Okada (2016)
Reduced dispersal and survival in the sweet potato weevil (Euscepes postfasciatus) after irradiation
Agricultural and Forest Entomology 18 (2), 157-166
Abstract: - In southern Japan, sweet potato weevils Euscepes postfasciatus (Fairmaire) are being eradicated using the sterile insect technique because of their damaging effects on sweet potato crops. However, the effect of irradiation on the dispersal and survival of this species needs to be evaluated.
- We observed the dispersal of normal and irradiated weevils for 21 days after their release in a sweet potato field during all four seasons, and estimated their survival using the Weibull function.
- Normal weevils generally moved further than irradiated weevils, and all weevils had greater dispersal distances in the summer than in the winter, with spring and autumn intermediate between these two extremes (summer: 0.23 m/day versus 0.29 m/day; winter: 0.15 m/day versus 0.07 m/day; spring: 0.20 m/day versus 0.17 m/day; autumn: 0.20 m/day versus 0.15 m/day, respectively).
- Normal weevils had low variation in mean life expectancy (approximately 8 days throughout the year), whereas the life expectancy of irradiated weevils was drastically reduced in the summer (2.20 days).
- The implications of these results for the efficiency of this eradication technique are discussed.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)
Link to article at publishers website

Research topic(s) for pests/diseases/weeds:
control - general

Pest and/or beneficial records:

Beneficial Pest/Disease/Weed Crop/Product Country Quarant.

Euscepes postfasciatus Sweet potato (Ipomoea batatas) Japan