Effect of spraying some chemical substances and a fungicide on floral malformation disease in mango.
Mahrous H. A. H.
Author Affiliation: Plant Pathology Research Institute, Agricultural Research Center, 9 Gamas Street, Giza, Fayoum, Egypt.
: 481-486
Abstract : Two field trials with 20-year-old mango tree cultivars Taimour and Mabrouka (high susceptible cultivars) were conducted in 1998 and 1990 in Egypt. The trees were sprayed with NAA at 200 ppm, IBA at 500 ppm, phosphoric acid at 500 ppm, gibberellic acid (GA3) at 50 ppm, zinc sulphate at 5% and cuprous oxide at 0.4%, after removing all affected floral panicles with 3 additional nodes behind these floral malformation (caused by Gibberella fujikuroi var. subglutinans), at full flowering. The incidence of floral malformation disease was best reduced in the next flower season by using any of the treatments compared with the untreated trees. The yield from treated trees was significantly higher during the first and second seasons in comparison with that of the untreated trees. NAA gave the best results, followed by IBA, phosphoric acid, zinc sulphate, GA3 and cuprous oxide.