仔虫 is read as しちゅう (shichuu) and means larva.
しちゅう
shichuu
むし
mushi (type of game played with a stripped deck)
こんちゅう
insect
がいちゅう
harmful insect
よわむし
coward
けむし
hairy caterpillar
きせいちゅう
parasite
ようちゅう
larva
みずむし
Asellus hilgendorfi (species of aquatic sowbug)
せいちゅう
imago
ぼうちゅう
protection from insects
にがむし
bitter-tasting bug
さっちゅう
killing insects or pests