The resistance of mango (Mangifera indica) cultivars to tip dieback disease in Florida.
Ramos L. J., Davenport T. L., McMillan R. T. Jr., Lara S. P.
Author Affiliation: University of Florida, Institute of Food and Agricultural Sciences, Tropical Research and Education Center, Homestead, FL 33031, USA.
Plant Disease 81 : 509-514
Abstract : The resistance of mangos to tip dieback disease caused by Botryosphaeria ribis was determined on 361 trees of 122 mango cultivars and relatives planted in the mango germplasm collection at the University of Florida, USA. Three trees from each cultivar were evaluated on a 1 to 5 scale ranging from those free of tip dieback to those with extensive branch necrosis. Each cultivar was assigned to 1 of 8 major systematic groups based on race or geographic origin. Resistance to tip dieback disease was not associated with any of the groups. No significant differences in mean disease severity were found among the Indian, Southeast Asian, West Indian, Haden or Sandersha parts of the Haden-Sandersha Complex, Turpentine types, or a group of unclassified cultivars. Two Mangifera species (M. odorata and M. zeylanica) showed the lowest mean disease rating. Cultivars were also grouped into monoembryonic and polyembryonic types. Although several mango cultivars, mainly found in the monoembryonic group, appeared to be free of the disease, resistance to tip dieback was not associated with embryony. This study provides the first indication that field resistance to tip dieback may be present in some mango cultivars.