Effect of CPPU (1-(2-chloro-4-pyridyl)-3-phenylurea) on fruit setting of mango (Mangifera indica L.) cv. Nam Dok Mai.
Subhadrabandhu S., Iamsub K.
Author Affiliation: Department of Horticulture, Faculty of Agriculture, Kasetsart University, Bangkok 10900, Thailand.
Kasetsart Journal, Natural Sciences 30 : 285-292
Abstract : In a field trial in 1990-91 at Kasetsart University, Nakhon Pathom province, Thailand, 4-year-old mango cv. Nam Dok Mai trees were sprayed on the inflorescences with 0-60 ppm of CPPU [forchlorfenuron] at 10 days after inflorescence emergence and at full bloom. Application of 0, 20, 40 and 60 ppm CPPU sprayed at 10 days after inflorescence emergence gave 3, 46, 29, 33 fruits per 10 inflorescences in the 1st week, 2, 7, 4, 2 fruits per 10 inflorescences in the 2nd week, 2, 3, 3, 2 fruits per 10 inflorescences in the 3rd week and 0, 2, 2, 0 fruits per 10 inflorescences at harvest. Trees receiving this chemical at full bloom produced 9, 110, 154, 193 fruits per 10 inflorescences in the 1st week, 4, 10, 50, 68 fruits per 10 inflorescences in the 2nd week 3, 1, 5, 12 fruits per 10 inflorescences in the 3rd week and 2, 0, 0, 4 fruits per 10 inflorescences at harvest. It was concluded that CPPU has some effects in the early stage of fruit setting in mango and that application at full bloom showed better results than that at 10 days after inflorescence emergence.