Abstract: A cover for selectively protecting a plant reproductive organ from pollination. Design features of the invention make it particularly useful in the hybridization of corn plants. The cover slips over the shoot of the corn plant when it is in the early stages of development and is left in place until the shoot is ready for pollination. The manner of construction imparts a bias to the cover towards drawing inward, assuring that it will remain in place during high winds, and allowing for expansion as the shoot increases in size. The cover is transparent to enable workers to observe developmental stages. The cover material is vapor permeable to prevent unwanted condensation from destroying transparency and to discourage the growth of mildew, fungus and bacteria.