how to blacklist a usb device in BSD?

I am having trouble communicating with a usb device while running Virtualbox on my iMac (Lion). Virtualbox is virtualization software which lets me run Windows XP as a guest OS. I am trying to run Palm Desktop for Windows on the virtual computer and I have trouble getting the USB connected Palm device to sync to the Windows application. It turns out the Palm device's use of the USB protocol is not quite conventional and so the virtual OS has trouble capturing it and presenting it to the Windows application.

Others who run Virtualbox under linux have seen this same problem with Palm devices and have found a workaround by disabling the host linux USB driver so that the Virtualbox application has unfettered access to it. This process is called "blacklisting" a USB device under linux, and involves editing the "/etc/modprobe.d/blacklist.conf" linux config file. My question is can I perform a similar operation in MacOS? The BSD I/O subsystem is different enough from linux to prevent me from knowing where to go in OSX to do a similar modification.