lava, lighning, fire, smog, and a lot more. its just that hashi wood style was stronger than most justu, his power was legendary, so even a fire element user like madara couldn't beat him
It is an advance KG so your basic fire and lightning can't do anything to it. I first thought maybe fire would be it's weakness but Madara has fire and he could not stop it. Kurama is fire but instead, he got binned by a wooden dragon.
Jinton,raiton,enton,other elements that can change shape,like mist or smog,steam release or smoke that can go around the wood.larva also turns it to ash.it wasnt that moukton had no weakness,it was the fact that hashi could use so much that it could over power the weaknesses.