BLIGHT DISEASE 

Blight refers to a specific symptom affecting the plant in response to infection by a pathogenic organism.It is simply a rapid and complete chlorosis, browning, then death of plant tissues such as leaves, branches, twigs or floral organs.
Many diseases that primarily exhibit this symptom are called blights

Notable examples are:

Late blight of potato, caused by the water mold.Phytophthora infestans Mont de Bary, the disease which led to the Great Irish Famine

DIFFERENT TYPE PF PLAGUE

Bubonic Plague

When a flea bites a human and contaminates the wound with regurgitated blood, the plague carrying bacteria are passed into the tissue.Y. pestis can reproduce inside cells, so even if phagocytosed, they can still survive. Once in the body,the bacteria can enter the lymphatic system, which drains interstitial fluid. Plague bacteria secrete several toxins, one of which is known to cause dangerous beta-adrenergic blockade.

Septicemic Plague

Lymphatics ultimately drain into the bloodstream, so the plague bacteria may enter the blood and travel to almost any part of the body. In septicemic plague, bacterial endotoxins cause disseminated intravascular coagulation DIC, causing tiny clots throughout the body and possibly ischaemic necrosis tissue death due to lack of circulation/perfusion to that tissue from the clots.DIC results in depletion of the body's clotting resources,so that it can no longer control bleeding. 

Pneumonic Plague

The pneumonic form of plague arises from infection of the lungs. It causes coughing and sneezing and thereby produces airborne droplets that contain bacterial cells and are likely to infect anyone inhaling them. The incubation period for pneumonic plague is short, usually two to four days, but sometimes just a few hours. 

Pharyngeal plague

This is an uncommon form of plague that resembles tonsillitis found in cases of close contact of patients with other forms of plague.

Meningeal Plague

This form of plague occurs when bacteria cross the blood-brain barrier, leading to infectious meningitis.