Gummosis is caused by a? by Sunday | Jul 4 | Agricultural Science WAEC | 0 comments A. fungus B. virus C. bacterium D. nematode E. protozoan Correct Answer: Option A – fungus Users Also Read These:Ripple in a power supply unit is caused by?Which of the following diseases is caused by a pathogen?Gummosis disease of citrus is caused by?Which of the following disease is caused by a bacterium?Increase in the supply of a product can be caused by?