Domestic quarantine undertakes inspections on seed potato and major fruit nursery plants to certify freedom from the virus and other harmful diseases in order to provide healthy propagation materials to the farmers.
Harmful pests such as the sweet potato weevil and the giant African snail occur in the Southwestern Islands (Okinawa, Amami) and Ogasawara Islands but not in other regions of Japan. Movement of these pests and their host plants out of the habitat regions are legally prohibited.
Also, in case when a pest has invaded Japan and seriously endangers domestic agricultural production, the movement of host plants is restricted and the emergency control is initiated by the government.

It is vitally important to detect newly introduced pests in its early stage of outbreaks in order to take immediate control measures. In an attempt toward such purposes, the Plant Protection Station install lure-bait traps at major ports of entry and international post offices. In the inland areas, prefectural pest control centers also join in the monitoring survey programs for the newly introduced pests.

To prevent the spread of harmful pests in Japan, the government undertakes emergency control. The Plant Protection Station joins in the operation and confirms the eradication for any further decisions to be taken on the program. The emergency control programs in the past are as follows.