Most Iowa strawberry growers, are more or less acquainted with the "slugs” that eat holes through the leaves of strawberry plants in the spring. Few, however, are aware that there are two kinds, appearing at different times, and with somewhat different habits. One has at times been abundant and even destructive in Iowa.
One of these slugs appears and gets in most of its injury before the strawberries are ripe; the other does not appear until about the time the fruit is ripe. The first- species (Empria fragariae) may be called the “early strawberry slug,” and the second (Empria maculata), the “late strawberry slug.”
Webster, R. L.
"Two strawberry slugs,"
Bulletin: Vol. 14
, Article 1.
Available at: https://lib.dr.iastate.edu/bulletin/vol14/iss162/1