Not sure..But, carry some alcohol swabs or put some rubbing alcohol in a small spray bottle. As soon as you touch posion ivy or your disc does, wipe your hands and disc down. It works very well. You can use the 70 or 90% kind.
I haven't gotten posion ivy since I found out about the rubbing alcohol.
According to PDGA players hand book you are able to ware gloves.
802.04 Artificial Devices
A. During a round, a player shall not use any artificial device that may assist in making a
throw, except those devices that reduce or control abrasion to the skin (such as gloves, tape,
bandages, gauze, etc.) and medical items (such as knee and ankle braces, etc.). Items used to prevent slipping on the teeing surface are also allowed. A player is specifically prohibited from using any artificial device that changes the position of the disc in the player's hand or artificially lengthens any of the player's throwing levers (fingers, wrist, arm, shoulder, etc.). The use of devices which assist in determining distances over 10 meters , such as range finders and GPS devices are prohibited. Measuring devices such as a tape measure may be carried and used to determine distances 10 meters and less for the purpose of rules enforcement.
If you are in an area where the plant parts (and oil) are very prevalent, Ivy Block might be a good investment. Put it on before you go out, wash well after you are done. Think of it as 'rub-on gloves'.
Oh, as suggested above, wash your discs often. Also consider that your bag or the bag strap might have oil on it if you keep getting a rash every time you play.
Yeah I got some tecnu and I'm going to soak my bag,straps and discs with that.I just go to the doctor as soon as I get the symptoms it's 20$ copay,a shot in the butt and the rash is gone in about 2-3 days.