Scott Hammond/Stuff Gas powered “bird bangers” are being dragged out the shed to scare birds away from grapes before harvest. Vineyards using gas-powered “bangers” to scare birds off ripening grapes are asked to check them as malfunctions can produce “a fireball” in dry grass. With parts of Marlborough reaching “dry” and “very dry” on Niwa’s drought index this month, coinciding with the start of the grape harvest, a spark from a bird banger could set a grass fire off to a roaring start. Scott Hammond/Stuff Starlings hunt for grapes to eat above vineyards near Renwick in Marlborough.