Q. Why are my mango fruit dropping? They are medium sized and look fine.
This usually is part of a normal process that fruit trees go through. When the tree has too many fruit for it to safely produce to maturity, the extras are dropped.
For mangos, other causes are: cold temperature damage, “nubbins” produced from faulty pollination (especially in Haden, Palmer, and Irwin) and fungal disease damage. Cold damage is unlikely to be the cause this year since most mangos bloomed again six weeks after the cold snap in early January. Since you did not see any evidence of disease, it appears that your tree is going through a normal fruit drop.
If your tree has a lot of fruit still left on the tree, make sure that your tree is properly fertilized. Use an 8-3-9, “palm special” or similar type fertilizer. Nutritional sprays are very beneficial.
To learn how to care for your mango, please read this UF Extension fact sheet: http://edis.ifas.ufl.edu/mg216
Adrian Hunsberger is an entomologist/horticulturist with the UF/IFAS Miami-Dade Extension office. Write to Plant Clinic, 18710 SW 288th St., Homestead, FL 33030; e-mail firstname.lastname@example.org.