Since as long as we've been human we have sought out a good luck symbol to protect us from all manner of negative influences.
A good luck symbol of any kind is steeped in superstition, and tied to the psyche of mankind. This is because symbols of good luck are symbols of our own hopes, and indications that we are cabable of fearing for our own safety.

Why are Ladybirds Lucky?
The most likely explanation for the belief that ladybirds are lucky is their dietary habits. In their menu there are harmful crop pests, so these friendly creatures have been always warmly welcomed by farmers and gardeners. The appearance of a ladybird is also considered as a blessing, which is the reason why there are positive associations with them in many cultures. Furthermore, they are believed to bring future luck in love, good weather, a financial windfall as well as grant wishes. In some cultures having a ladybird land on a person is supposed to be particularly lucky whereas when a ladybird lands on an object, it will be replaced by a new and improved one.

In some Christian societies, especially in Europe, the ladybird is linked with the Virgin Mary, also known as Our Lady to devout Catholics. In early paintings Mary was often depicted wearing a red cloak and the spots of the seven spot ladybird were said to symbolize her Seven Sorrows. What is more, according to the legend, one very unfortunate year fearful of their crops farmers prayed to the Virgin Mary for protection of the fruit of their hard work. She listened to their prayers and sent beetles. They made a feast of invading insects, saving the crops. From that day forward little winged rescuers were called “Beetles of Our Lady”. Later the name was shortened to “lady beetles”. This story explains the origins of the referring to the Virgin name “ladybird”, also known as a “lady beetle” or “ladybug”.