1. a USDA, Agric. Res. Serv. , Tropical Fruit and Vegetable Research Laboratory , P. 0. Box 2280, Honolulu, HI, 96804
2. b Nuclear Institute for Agriculture and Biology , Lyallpur, Pakistan
3. c Hawaii Agricultural Experiment Station, College of Tropical Agriculture and Human Resources , University of Hawaii , Honolulu, HI, 96822