Ladybugs are helpful to the environment because they eat insects that cause harm to plants. An infestation of ladybugs to certain crops can help dramatically reduce the number of aphids, and mites. They are also useful in helping eliminate mealyworms.
You might want to keep a few ladybugs around your home, because they eat aphids. aphids are other yucky insects. So they work kind of like a pesticide for other annoying bus.
Yes, they are very helpful and beneficial insects ! They eat aphids and things that will ruin your plants. They should leave on their own in time. Killing them should be a last resort.
Yes of course, some species of ladybugs are natural depredators of others pests like aphids frequently the good ones have the red body with dark circle spots and dark head