Waste of money. Goods arrived in small flat box, not a tube as instructions stated.Pictures bore no relation to the items in box, i.e. numerous strips and circles of white paper with a lot of minute black dots. no bigger than the blackfly I was wishing to kill. I phoned company who confirmed they were the larvae and suggested I gently brushed them off on to a leaf with a small paintbrush. This I did and most fell off on to the ground. Blackfly continued to thrive! Still wondering what the white papers were for.