There was a fungus that you could apply to your yard which killed ticks. It was called Met52, made by Novozymes. They appear to have sold the rights to it to

There was a fungus that you could apply to your yard which killed ticks. It was called Met52, made by Novozymes. They appear to have sold the rights to it to Lallemand: https://www.lallemandplantcare.com/en/usa/products/product-details/lalguard-m52-od/ https://www.lallemandplantcare.com/en/usa/products/product-d... https://www.lallemandplantcare.com/wp-content/uploads/2023/03/LALGUARD-M52-OD_PRO_General-Greenhouse-US-EN_03-2024-2.pdf https://www.lallemandplantcare.com/wp-content/uploads/2023/0... https://www.lallemandplantcare.com/wp-content/uploads/2023/03/SDS-LALGUARD-M52-OD-EN-2.pdf https://www.lallemandplantcare.com/wp-content/uploads/2023/0... https://www.lallemandplantcare.com/wp-content/uploads/2023/03/LALGUARD-M52-OD_Specimen-Label-US-EN_01-2023.pdf https://www.lallemandplantcare.com/wp-content/uploads/2023/0... The above specimen sheet does mention use against ticks. Also if you look up the old Novozymes safety sheet it mentions use for tick suppression (pages 4 and 5): https://evenspray.com/wp-content/uploads/2021/04/Met52_EC_label_2019.pdf https://evenspray.com/wp-content/uploads/2021/04/Met52_EC_la... I had Met52 applied to my yard just before it went off the market for use against ticks and haven't seen a tick since. Possibly the fungus has taken up residence in the soil, though I still take precautions since Met52 protection was not supposed to last forever and required periodic reapplication. You can still buy Met52 and Lallemand's version: https://www.evergreengrowers.com/m52-lalguard.html https://www.evergreengrowers.com/m52-lalguard.html https://www.planetnatural.com/product/met52-ec/ https://www.planetnatural.com/product/met52-ec/ I have not been able to find any information about why it is no longer advertised for use against ticks. The pesticide specialist I hired to do my yard says Met52 was discontinued because no one was buying it (not enough profit). It's still widely used against a variety of agricultural pests in greenhouses and on farms. It's supposed to be very safe, it is not a poison and it targets only specific pests, though the application instructions say the applicator should wear a high quality pesticide style respirator when applying it (breathing lots of spores does seem like a risk and maybe the liquid the spores are in is toxic). I am NOT recommending anyone try applying it themselves. Talk to a licensed pesticide specialist if you want to make inquiries about it. It could be an option for some people. It appears to be available in most of the USA.