Rice Emasculation

In order to successfully cross-pollinate two different rice plants, the anthers must be removed from the rice floret so that self-pollination does not occur. Here we provide instructions for removing anthers, or emasculating, a rice floret. Also, we provide here instructions for building a vacuum emasculator of your own.

Emasculating Rice Flowers

Vacuum Emasculator Construction Plans

We encourage you to download the Construction Plans or contact the scientists listed below who have received emasculators built from this design. These plans are based on a design detailed in two articles written by Drs. Coffman and Herrara (1) and Dr. Coffman (2), and modified by Nick VanEck of Cornell University.

Groups who have built an emasculator


  • (1) Herrera, R. M. and W. R. Coffman (1974) Emasculation of rice by vacuum extraction. In: Proceedings of the Fifth Scientific Meeting, Crop Sci. Soc. Philippines, Naga City p. 12-14. (PDF)
  • (2) Coffman, W. R. (1979) Genetic evaluation and utilization: Overall Progress. IRRN: 4 (1): 2-3 (PDF)
  • (3) Coffman, W. R. and R. M. Herrera (1980) Rice. In: Fehr W.R. and Hadley, H. H. (eds) Hybridization of Crop Plants. Amer Soc Agronomony, Madison, WI, USA, pp 511-522.
  • (4) Mackill, D., Coffman, W. R., Garrity, D. P. (1996) Rainfed lowland rice improvement, IRRI.