For several years we have had a problem with an explosion of lady bugs. The bugs cover our window screens and the side of the house. Many make their way into our house. This past summer we had a front porch built across the front of our house. Unfortunately, the lady bugs have decided they want to also share the porch with us, covering a good part of the ceiling and brick front. I also discovered that lady bugs apparently bite! They would fall on me and I would feel a bite and them have a small, itchy welt. What can be done??? It is not pleasant to sit on our new porch (especially with guests) with a swarm of bugs! Thank you for any help you can give us.
Based on your description this sounds like the multi-colored asian lady beetle. They are considered nuisance as well as beneficial insects. In the fall they look for overwintering sites for the winter in and around homes and buildings . Adults apparently secrete an aggregation pheromone, which results in large numbers of beetles gathering at sites such as attics and basements. Prevent entry by sealing or caulking any cracks, crevices or holes in the exterior walls and especially around windows and doors.
Vacuum up the lady beetles and dispose of the bag outdoors. Do not swat or crush the lady beetles because they release a yellow-orange liquid that can stain fabrics and walls. See the attached publication for more information http://extension.umd.edu/sites/default/files/_docs/programs/hgic/HGIC_Pubs/HG49_Asian_%20Lady_Beetle...