Japan is sounding the alarm against the inexorable march of the fall armyworm, as reports of damage by the pest in Asia following its spread in Africa are increasing, threatening Japan with infestation.

The Ministry of Agriculture, Forestry and Fisheries has warned of significant damage to farm products unless authorities and farmers take appropriate measures to remove the insect in a timely fashion.

First detected in Kagoshima Prefecture in July last year, the fall armyworm has caused damage in about 30 of the nation's 47 prefectures.