Effect of Bayfolan and some growth regulators on modifying flowering and the incidence of flowering malformation of mango Mangifera indica L.
El-Beltagy M. S., El-Ghandour M. A., El-Hamawi H.
Author Affiliation: National Research Centre and Agricultural Research Centre, Cairo, Egypt.
Egyptian Journal of Horticulture 6 : 125-133
Abstract : In trials with 22-year-old trees of the mango cv. Timour showing 75% panicle malformation, Bayfolan (containing N, P, K, Fe, Cu, Mn, B, Zn, Co and Mo) at 100 ml/tree was applied to the soil in February in an on year. Bayfolan appreciably reduced the number of panicles, both total and malformed, but had no significant effect on the number of healthy panicles and did not affect the percentage of malformed panicles. GA3 at 100 or 250 p.p.m. significantly reduced the number of total, healthy and malformed panicles and increased the percentage of malformed panicles. CCC [chlormequat] at 20 or 500 p.p.m. applied to Bayfolan-treated trees reduced the percentage of malformed panicles and increased that of healthy panicles. In all cases CCC at 500 p.p.m. reduced the total number of panicles. Ethephon at 50 or 150 p.p.m. increased the percentage of malformed panicles and slightly decreased that of healthy panicles. NAA at 50 p.p.m. appreciably increased the total number of panicles but had no marked effect on the incidence of malformation.ADDITIONAL ABSTRACT:The effect of various compounds alone or with Bayfolan on the number of malformed panicles in mango cv. Timour is tabulated. A combined soil application of Bayfolan and spray of cycocel reduced the percentage of malformed and total number of panicles. Naphthalene acetic acid (50 p.p.m. spray) increased the total number of panicles without affecting the incidence of flowering malformation. The cause of the disorder is as yet unknown.