disease development in the plant.

An organism that is restricted to subsist on living organisms and attacks only living tissues.

Any agent (biotic or abiotic) that causes a disease.

It looks into the characteristics of diseases, their causes, plant-pathogen interactions, factors affecting disease development in individual plants and in populations, and the various means of controlling diseases.

It is the study of weeds, their biology and their control, whether it be manual, mechanical, cultural, biologival, chemical or ecological.

Disease that cause famine and death of more than a million people in Ireland.

the capacity of a pathogen to cause disease.

An organism that has the ability to become a saprophyte but is ordinarily a parasite.

A plant that is susceptible to a disease whether or not the pathogen is parasitic.

An organism which depends wholly or partly on another living organism for its food. Most of these kind of organisms are pathogens.

Whetzel (1929) called the malfunctioning caused by nonliving or inanimate agents as:

The following are the areas of weed science research, except:

A plant being attacked by a parasite. A food relationship with a parasite (pathogen) is implied.

It deals with the application of the knowledge gained from studying the science.

An organism that lives on dead organic or inorganic matter.

it is the nemesis of corn

The raison d'etre or ultimate objective of plant pathology:

Greek "pathos"

;It is the mechanisms by which these factors induce disease in plants ;and of the methods of preventing or controlling disease and reducing the damage it causes.

An organism which has the ability to become a parasite although it is a saprophyte.

Greek "logos"