Abstract: A tree injecting disposable device having a funnel housing, compression housing and a plunger housing in cooperative engagement with each other. A tube on the end of the funnel housing is used for inserting into a pre-drilled hole in a tree. A systemic pesticide or fertilizer liquid is sealed within the device. As the plunger housing is depressed a spike within the plunger housing breaks a thin membrane in the funnel housing and allows the liquid to move from the inside of the device by plunger pressure and gravity into the tree.