An account of a growers field day held at a Florida CUPS (Citrus Under Protective Screen)1.3 acre screened grove at a U. Of Florida research field. A handout distributed at the field day stated that Ray Ruby, Ruby Red and Flame grapefruit, as well as Honey Murcott, thrive in CUPS. The handout indicated Ray Ruby grapefruit in the 2018-19 season, the fourth year of CUPS production, yielded an average of 892 boxes per acre with 100 percent packout. Honey Murcott yielded an average of 529 boxes per acre with 100 percent packout. The per-acre yields were extrapolated from actual production of .24 acres of Ray Ruby grapefruit and .34 acres of Honey Murcott. Revenues were $25.89 per box for Ray Ruby, or $23,094 per acre, and $42.48 per box for Honey Murcott, or $22,472 per acre.