Dying due to too high density?

Hi, welcome.

Density is a measure of mass per volume. I don't see a correlation to what you're asking, whether density and death are related? Maybe you can elaborate further on your thinking

Forgive my imprecise questioning.

My question is: is there a regulation in a high population of an organism by diseases? for example in plants: is there a regulation in the overpopulation of a species by diseases? Or only by nutrient deficiency or light deficiency?

Plants are as susceptible to diseases as animals are, and it is not limited to nutrient/light deficiencies.

For example, bacteria-induced diseases cause things like soft rot, leaf spot, wilt of leaves and stems, etc. Fire blight, a disease of apple and pear trees, is historically interesting because it was the first plant disease in which a bacterium was shown to be the inciting agent. Infected trees exhibit a blackening of the flowers, leaves, and twigs, and the disease finally may involve the entire tree, causing serious damage and even death. Other examples include "citrus canker" - an Asian disease of the orange tree and its relatives.

You also have fungi-induced diseases in plants. A prominent disease of potatoes, called late blight, causes rots leaves, stems, and tubers to rot. A parasitic root fungus, Hemileia vastatrix, targets coffea species - one's responsible for giving us the coffee fruit.

Does that help answer your question?