daphne, those might be " sow * bugs (spoken, as if a piggy momma) , pill, or roley poley (sp.?) bugs are common names, for this pest.. They can chew rhizomes & may come out at night & find the root to be a delicacy & return nightly for more tasty treats . They are grey in color & if you locate a hoard in the day, they make a mad dash for it.. Some curl up in a ball & others go running off...
I have used a, cheap peeled cucumber, as bait & grab the cucumber later at night, quickly & dump them into a receptacle, to help reduce numbers & eventually you won't have nearly as many, to contend with to do as much damage, by repeating the procedure.
You may also try to locate a "cool damp spot", under which they may hide out, during daytime. Just be ready to take quick action, as they will try to quickly disperse & escape, after uncovered & get into difficult areas, to hide from you ! They can even be tunnelled, in holes, near the bottom of plastic pots, or hiding out near the base of the crown, of nearby leafy plants,....
