Caryocolum blandulella is a moth of the family Gelechiidae. It is found in Great Britain, the Netherlands, Spain, France, Germany, Denmark, Finland, Sweden, Switzerland, Italy, Croatia, Hungary, Greece and Ukraine, as well as Corsica.[1] The habitat consists of coastal sand-dunes.[2]
The length of the forewings is 4–5 mm for males and 4–5.5 mm for females.[3] Adults have been recorded on wing from mid-July to late August.
The larvae feed on Cerastium pumilum and possibly Cerastium semidecandrum. They feed on the seed-capsules, living between seeds spun together with silk.[4] Larvae can be found in early June.