Certis Biologicals Deliver Organic Insecticide, 2.5 PoundDeliver provides uniform dispersion of Bt in spray droplets and facilitates better spreading and sticking Up to five times more potent, pound for pound than conventional BTS . Higher potency means more control power against pests . After consuming a lethal dose of Deliver, larvae stop eating within an hour. Deliver is a biological insecticide specific for use against the lepidopterous larvae listed on the label. Deliver must be eaten by the larvae to