You can mix Bifen IT with an herbicide as long as there are no restrictions on the label for the other product that you are using. We recommend performing a small jar test for compatibility any time you are using two new products together for the first time. Be mindful that you are only applying your herbicide in the correct areas.
Bifen IT could possibly kill hoverflies if they contact a treated area long enough to receive a lethal dose. Hoverflies are actually beneficial insects that feed on other insects that might attack plants. They also are pollinators that help your flowering plants. We apologize that we do not offer advice/products for killing beneficial insects.
Bifen IT can be tank mixed with other products in a tank sprayer. For something like humic acid, we always recommend a small jar test for compatibility before mixing a full tank. It can also be mixed with other herbicides as long as the herbicide label does not state otherwise. You just want to make sure you apply the right amount of products per gallon and per 1,000 sqft.
It is not recommended to leave any type of chemical in areas where they could freeze or over heat because of the potential for the chemical to break down. According to the manufacturer, as long as the Bifen IT was only exposed to sub freezing temperatures for a short period of time and the product looks exactly the same as before it was exposed, it should be fine.
You should dethatch first and then treat with Bifen IT for increased effectiveness. You should water in the product after application to reach the areas they feed.
While Bifen IT is labeled for bedbugs, we recommend that you use a combination of products to effectively eliminate them from your home. We have put together Bedbug Kits that come with all of the products that you will need. Please see our Bed Bug Pest Guide for more information about treating for bed bugs.