Orange leaves with symptoms of manganese or zinc deficiency: Mn deficient (top row), both Zn and Mn deficient (middle), Zn deficient (bottom row).

Orange leaves with symptoms of manganese or zinc deficiency: Mn deficient (top row), both Zn and Mn deficient (middle), Zn deficient (bottom row), San Bernardino Co.  Credit: Robert G. Platt
Credit: Robert G. Platt