Houseflies are highly attracted to sugary human foods and human activity. Gray with yellow/brown coloring on their sides, these pesky nuisance insects get in through open windows, doors, cracks and crevices and stay because they can’t find their way out. They lay their eggs in some of the dirtiest spots in the house, like inside garbage cans and on pet feces, and those hatching eggs complete their life cycle to adults in just two weeks (under ideal conditions, there can be 10 to 12 generations in one summer). Houseflies can carry diseases like salmonella, E. coli and cholera and can transmit them to humans when they touch our food. Keeping food in sealed containers, keeping trash containers closed and making sure window screens are in good working order can help reduce housefly activity.