Toxicodendron diversilobum skin contact first causes itching; then evolves into dermatitis with inflammation, colorless bumps, severe itching, and blistering.
In the dormant deciduous seasons the plant can be difficult to recognize, however contact with leafless branches and twigs also causes allergic reactions.

Urushiol volatilizes when burned, and human exposure to T. diversilobum smoke is extremely hazardous, from wildfires, controlled burns, or disposal fires.
The smoke can poison people who thought they were immune.
Branches used to toast food over campfires can cause reactions internally and externally.

Urushiol is also found in the skin of mangos, posing a danger to people already sensitized to T. diversilobum when eating the fruit while it is still in the rind.
Toxicodendron diversilobum skin contact first causes itching; then evolves into dermatitis with inflammation, colorless bumps, severe itching, and blistering. In the dormant deciduous seasons the plant can be difficult to recognize, however contact with leafless branches and twigs also causes allergic reactions.
Urushiol volatilizes when burned, and human exposure to T. diversilobum smoke is extremely hazardous, from wildfires, controlled burns, or disposal fires. The smoke can poison people who thought they were immune. Branches used to toast food over campfires can cause reactions internally and externally.
Urushiol is also found in the skin of mangos, posing a danger to people already sensitized to T. diversilobum when eating the fruit while it is still in the rind.
Toxicodendron diversilobum