What is a plant disease?
Plant disease is defined as a condition in plants characterized by the disruption of normal physiological processes, often resulting from the interaction with pathogens that trigger immune responses, including various signals and phytohormones that regulate programmed cell death and innate immunity. On the other hand, pathogenic fungi cause plant diseases such as anthracnose, leaf spot, rust, wilt, blight, coils, scab, gall, canker, damping-off, root rot, mildew, and dieback.Plant pathogenic bacteria cause many different kinds of symptoms that include galls and overgrowths, wilts, leaf spots, specks and blights, soft rots, as well as scabs and cankers.A symptom is a change in plant growth or appearance that may indicate or describe a plant health problem. Examples of symptoms include yellowing, wilting, dieback, galls or blight.Most plant diseases – around 85% – are caused by fungal or fungal-like organisms. However, other serious diseases of food and feed crops are caused by viral and bacterial organisms. Certain nematodes also cause plant disease.Symptoms. Because viruses are microscopic, the presence of a virus is only noticed if it produces recognizable symptoms in the organism it is infecting. In plants these symptoms include mosaic patterns, flower-break, deformed growth, chlorosis or yellowing, stunting and leaf distortion, ringspots, and vein clearing.
What are the 7 categories of diseases?
The most widely used classifications of disease are (1) topographic, by bodily region or system, (2) anatomic, by organ or tissue, (3) physiological, by function or effect, (4) pathological, by the nature of the disease process, (5) etiologic (causal), (6) juristic, by speed of advent of death, (7) epidemiological, and . A variety of microorganisms can cause disease. Pathogenic organisms are of five main types: viruses, bacteria, fungi, protozoa, and worms. Some common pathogens in each group are listed in the column on the right. Infectious agents can grow in various body compartments, as shown schematically in Fig.There are four main types of disease: infectious diseases, deficiency diseases, hereditary diseases (including both genetic and non-genetic hereditary diseases), and physiological diseases. Diseases can also be classified in other ways, such as communicable versus non-communicable diseases.Infection occurs when germs enter the body and multiply, causing disease and illness. Different kinds of pathogens, a fancy term for germs, cause different types of sickness and disease. They come in four types – viruses, bacteria, fungus, and parasites.There are four main types of disease: infectious diseases, deficiency diseases, hereditary diseases (including both genetic and non-genetic hereditary diseases), and physiological diseases. Diseases can also be classified in other ways, such as communicable versus non-communicable diseases.
How many diseases are in plants?
There are more than 80,000 plant diseases known worldwide. In fact, all plants are vulnerable to attack by disease. Crop plants are frequent victims, and crop diseases can result in enormous agricultural and economic losses. The document discusses various methods for controlling plant diseases, including regulatory, cultural, biological, physical, and chemical methods. Regulatory methods aim to prevent the spread of pathogens through quarantines and inspections.
What are the 4 main diseases?
There are four main types of disease: infectious diseases, deficiency diseases, hereditary diseases (including both genetic and non-genetic hereditary diseases), and physiological diseases. Diseases can also be classified in other ways, such as communicable versus non-communicable diseases. The most widely used classifications of disease are (1) topographic, by bodily region or system, (2) anatomic, by organ or tissue, (3) physiological, by function or effect, (4) pathological, by the nature of the disease process, (5) etiologic (causal), (6) juristic, by speed of advent of death, (7) epidemiological, and .