HORTICULTURE

Detailed explanation-1: -Noninfectious diseases are caused by environmental imbalances and cannot be spread to other plants. Noninfectious disease examples include over watering, nutrient deficiencies, and air pollution damage. Plants are most susceptible to disease when they are under some type of stress.

Detailed explanation-2: -Non-infectious diseases are caused by unfavorable growth conditions; they are not transmitted from a diseased plant to a healthy one. Infectious diseases, on the contrary, can spread from one susceptible host to another, since the infectious agent can reproduce in the plant or on its surface.

Detailed explanation-3: -Infectious plant diseases are caused by living (biotic) agents, or pathogens. These pathogens can be spread from an infected plant or plant debris to a healthy plant. Microorganisms that cause plant diseases include nematodes, fungi, bacteria, and mycoplasmas.