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Definitions

Immunity: Not subject to attack or infection by a specified pest.


Resistance
is the ability of a plant variety to restrict the growth and development of a specified pest and the damage they cause when compared to susceptible plant varieties under similar environmental conditions and pest pressure. Resistant varieties may exhibit some disease symptoms or damage under heavy pest pressure.


Two levels of resistance are defined
:


High resistant
plant varieties highly restrict the growth and development of the specified pest under normal  pest pressure when
compared to susceptible varieties. These plant varieties may, however, exhibit some pest related symptoms or damage under heavypest pressure.


Intermediate resistant
plant varieties restrict the growth and development of the specified pest, but may exhibit a greater range of
symptoms compared to high resistance varieties. Intermediate resistance plant varieties will still show less severe pest related
symptoms or damage than susceptible plant varieties when grown under similar environmental conditions and/or pest pressure.


Susceptibility
is the inability of a plant variety to restrict the growth and development of a specified pest.

Abiotic stresses
:


Tolerance
: The ability of a plant variety to endure an abiotic stress(s).


Sensitivity (antonym for tolerance)
: The inability of a plant variety to endure an adiotic stress(s).

Note: Abiotic stress is caused by non-living, physical or other adverse environmental factors. (e.g. heat, drought, herbicide).

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