Infectious plant diseases are caused by bacteria, fungi, or viruses and can range in severity from mild leaf or fruit damage to death. The following is a list of some of the major plant diseases, grouped by type of causative agent and ordered alphabetically:
rice bacterial blight
Dutch elm disease
gray mold rot
Hope this helps!
the question isn't complete here so i can't right an answer '_'
hydrogen is a compound or a single element and a element is a pure substence that cannot be separated into simpler subtances
clorine is a compound its a chemical substance that forms when two or more different elements combine
so both hydrogen and clorine are compounds