The lady bug was adopted as the official state bug of Delaware in 1974 thanks to an intensive effort made by Mrs. Mollie Brown-Rust and her 2nd grade students of the Lulu M. Ross Elementary School in Milford, Delaware.

Also called lady beetle, ladybird, or ladyfly, lady bugs help gardeners and farmers by eating tiny insect pests that ruin plants. Lady bug beetles are not native to North America, but were introduced from Japan by our national government to help control crop pests.

A ladybug can consume up to 60 aphids per day, but will also eat a variety of other insects and larvae (including scales, mealy bugs, leaf hoppers, mites, and other types of soft-bodied insects), and also pollen and nectar. There are 350 species of lady bugs in the USA. See a list of State Insects for all 50 States.

Source:

Delaware Facts and Symbols: Delaware Official Website

Links:

State Insects - 50 States List