This invention is directed for a marker which can be dropped from an airplane so that the pilot of an airplane can see the marker on the ground and know, when he is in the airplane, where the airplane has flown for spraying fertilizer, insecticides, herbicides, and the like. The drop marker comprises two base members and a folded streamer strip of attached at each end to a base member. The drop marker unfolds when falling from the airplane toward the ground. The drop marker, upon reaching the ground and with the streamer strip unfolded, makes it possible for the pilot of the airplane to know where he has sprayed the chemical carried by the airplane.