Blaniulus guttulatus

(Millipedes)

Millipedes, the most common species of which is the spotted snake millipede (Blaniulus guttulatus), are hard-shelled myriapods. The millipede B. guttulatus is between 10 and 18 mm long (photo 1) and has a thin, grey, elongated body (with brownish spots on the sides), consisting of 50 similar segments (with 2 pairs of legs on each), and is often curled up on itself when disturbed or dormant (photo 2).

These millipedes are mainly found in soils which are rich in organic matter, as they feed on decaying plant debris. However, when in large quantities, they may bite and damage underground plant organs: roots, stems and stolons. On the potato, the main damage is caused by superficial gnawing of the tubers. 

Eggs are laid in holes beneath the soil surface. Larvae gradually grow through several moults and become adults which then overwinter in the soil. The duration of the cycle is about 3 years.