Invasive species Rubia japonica beetle damage confirmed in Hyogo and Nagano

Authorities in Japan are responding to the spread of the invasive species Rubia japonica beetle, also known as the red-necked longhorn beetle. In Amagasaki, Hyogo Prefecture, officials confirmed the first instance of damage to cherry trees on private land in the Tsukaguchi Honmachi area. While a single adult beetle was spotted in the city in June, this marks the first discovery of frass (a mixture of insect excrement and wood debris) and actual tree damage.

The beetle is classified as a specified invasive species because its larvae feed on the interior of trees such as cherry, plum, and peach, which can lead to agricultural loss and falling trees. In Hyogo Prefecture, the species has previously been identified in Akashi, Kobe, Hanshin, Tanba, and the North Harima regions.

In Achi Village, Nagano Prefecture, local authorities have established a response project team to protect approximately 10,000 peach trees from the infestation. The village is holding meetings to coordinate countermeasures against the pest.