Hazard
The term hazard in the Pikmin games refers to the deadly non-living traps and dangers of the Pikmins' world. All types of hazards are listed below. All hazards, except explosions, have no effect on Bulbmin.
Fire
Fire hazards are usually in the form of fiery geysers spouting from the ground. In the first game, they are indestructible, but in the second game, they can be destroyed by the Pikmin. If a Pikmin catches fire, it can be stopped simply by calling it, which will somehow put it out. Fire cannot spread between Pikmin. Red Pikmin cannot be hurt by fire hazards. Some enemies also release/create fire, such as the Fiery Blowhog and Fiery Bulblax.
Electricity
Electricity is the only hazard in the game that Pikmin can't be saved from. It usually comes in the form of electric wires in the ground, between which electricity intermittently visibly flows. If any Pikmin touches electricity, they will be instantly fried, with no chance to save them. Yellow Pikmin aren't hurt by the electricity, and can easily dispatch of these death traps. Electric fields can also be caused by the Anode Beetle.
Water
Water hazards include all pools of water in the world of the Pikmin. Pikmin that get into the water will start to drown, but may have a chance to survive if they are repeatedly called over. Alternatively, blue Pikmin can be thrown in to throw drowning Pikmin out, as the blue ones can't drown. Water hazards also include, on rarer occasions, droplets of water that get stuck on the Pikmin's heads. This can also be cured by calling them. Some water pools can be destroyed by breaking the rock seal in the pools, thereby revealing a hole that will drain it. Some enemies also release/create water, including the Watery Blowhog and Titan Dweevil.
Poison
Poison hazards refer mainly to gas pipes that gather poison around a Pikmin's leaf, effectively choking them. This can be also cured by calling the Pikmin over. The gas pipes constantly spit gas in all directions; therefore, only white Pikmin can break them. Certain enemies, such as the Doodlebug, will also emit gas, though not constantly.
Explosion
Bomb-rocks explode. Any pikmin around will die. You may find bomb-rocks scattered on the ground of caves with 'rusty' terrain, as well as them falling from the air in even more types of caves. They are also produced by the Careening Dirigibug. The Volatile Dweevil itself also acts like a bomb that can move and fall from the air. The explosion hazard is not created by the Titan Dweevil.