Report of Sweet potato weevil（Cylas formicarius）in Japan

Publication Date

Thu, 16 Mar 2023, 04:09

Last Updated

March 16, 2023, 4:09 a.m.

Report Number

JPN-10/1

Country

Japan

Pest Id

Cylas formicarius - (CYLAFO)

Report Status

Final

Hosts

Sweet potato (Ipomoea batatas), Stictocardia tiliifolia, Pharbitis, Ipomoea, Calystegia

Pest Status (ISPM 8 - 2021)

• Present: not widely distributed and under official control

Geographical Distribution

Hamamatsu city, Shizuoka Prefecture in Japan

Summary

In October 2022, Sweet potato weevils (Cylas formicarius) were detected in Hamamatsu city, Shizuoka Prefecture in Japan. Immediately after receiving the report, the NPPO conducted surveillance in order to delimit the infested area and took immediate control measures. The NPPO designated the control area and pest control measures for emergency control under the Plant Protection Act. It will be entry into force from 19 March 2023 by the ministerial ordinance. The control measures include: prohibition of cultivation of host plants in the designated area, restriction of movement or disinfestation/destruction of fresh stems, fresh leaves, and underground parts of host plants.

Danger

Sweet potato weevil is considered as a significant and damaging pest of sweet potato and is a quarantine pest for Japan. In Japan, Sweet potato weevil is present only in some parts of Southwestern Islands and Ogasawara Islands, and the movement of host plants is restricted by the Plant Protection Act.

Contact for info

[email protected]

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