Plant Diseases Flashcards
a harmful alteration of the normal physiological and biochemical growth of the plant, or it is a condition in which a plant differs from a normal, healthy plant in
appearance, structure, or function
plant disease
caused by a living organism or a pathogen
Infectious diseases or
biotic diseases
a living, disease-producing agent that can multiply and be transmitted from
plant to plant
pathogen
the study of plant diseases
plant pathology
when pathogens may infect the entire plant
systemic infection
when pathogens infect certain plant parts
localized infection
microscopic one-celled organisms that reproduce by simple
division
bacteria
eukaryotic organisms (organisms whose cells are organized into complex structures by internal membranes)
fungi
microscopic roundworms that live in the soil and feed on plant root systems
nematodes
are tiny pathogens that require sophisticated microscopes to be seen. They usually enter plants and cause systemic infections. They cannot move on their own; they are commonly spread by insects and seeds.
virus
organisms that benefit from prolonged associations with other organisms or hosts. Hosts are harmed by the symbiotic relationships.
parasites
not caused by pathogens. Instead, these diseases are caused by elements in the environment that are damaging to plants. These diseases cannot be transmitted from plant to plant.
Noninfectious diseases or
abiotic diseases
the principle on which plant pathology is based. The three components of are a susceptible host plant, a disease-producing agent, and a favorable environment.
disease triangle
is the introduction of the pathogen to the host plant tissue.
Inoculation
a period during which the pathogen develops a form that can penetrate or
infect the new host plant
incubation
