From Pathfinder #202: Severed at the Root, which isn't enabled.

Defoliation Bomb (Lesser)

ITEM 2

UNCOMMON ALCHEMICAL BOMB CONSUMABLE SPLASH VOID

Price 7 gp

Usage held in 1 hand

Bulk L

Category martial

Group bomb

Damage 1d6 void + 1d4 persistent void + 1 splash

Range 20 ft.

Activate Strike

This brightly painted ceramic sphere contains chemicals that cause plants to wither and die. A defoliation bomb deals the 1d6 void damage, 1d4 persistent void damage, and 1 void splash damage to all plants in the area. Non-creature plants in the area immediately wither and die.

Pathfinder #202: Severed at the RootORC