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Anna
Anna, Teacher, writer, biologist
Category: General
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Experience:  Great research skills, variety of work experiences, teaching experience.
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What lice am I finding on my window sill? I have window

Customer Question

What lice am I finding on my window sill? I have window boxes with plants in them and had thought they must be bird lice but someone has repeatedly been climbing up and trying to get in through the window. I looked them up and they look like human lice rather than the pictures of bird lice. What other lice look the same and how can I get rid of them and prevent them from being a problem again? Thank you.
Submitted: 5 months ago.
Category: General
Expert:  Anna replied 5 months ago.

Hello and welcome. My name is ***** ***** I'm a biologist. I'm sorry to hear you are having a problem. Unfortunately, there are over 500 species of lice in the world, plus some plant feeding insects that are called lice (and look like them), so it will be nearly impossible to tell you exactly what these insects are. Most are specific to one host - only birds, only humans, etc. However, since they aren't on any warm-blooded animals, I can tell you a way to get rid of them.

Start with a good soaking spray from a hose. Spray the plants in the window boxes, the window, and the surrounding area. When the area is dry, insecticidal soap (available at garden centers and nurseries) applied liberally should kill the insects. I usually treat twice about a week apart. A few days after the second treatment, give the plants another shower to wash away dead pests. Check repeatedly for even a few of these insects, and if you see them, repeat the treatment. Immature forms can live in the soil, and so you may see them popping up again every so often.

If you have more questions, let me know I wish you success in getting rid of the insects.

Anna

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Customer: replied 5 months ago.
Hi Anna, thank you for your message. They match the Google images of human body lice(!). As it is a 1st floor window ledge with a planted up window box, do bird, cat or rodent lice look the same? It is not impossible for them to be human body lice as I have caught a man crouching on the parapet at 2nd floor level, another on a ladder against the 1st floor window, possibly the same one who now walks across the rooflines and another woman at ground level destroying brickwork and digging up plant roots, applying herbicide etc at night and obviously without permission! Do you know if the human lice look similar to any of these types?Many thanks,Eleanor
Expert:  Anna replied 5 months ago.

You're welcome, Eleanor. Rodent lice do look similar to human lice. However, all of these lice can only live for 24 hours when not on a host. They wouldn't be able to live on a window ledge or in plants, but need a warm blooded animal to survive. So, while it's certainly possible lice could have come off of some of your unusual visitors, after 24 hours, the lice would die.

Regardless of what these are - human lice or plant pests - the method I gave you will work to get rid of them. You won't be able to use the hose, but you can douse everything with insecticidal soap. If you prefer, you can also use a stronger insecticide sold in nurseries.

Let me know if you need anything else.

Anna

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