AGRI 42 Flashcards
repercussions of the dependence on pesticides
resistance of pests to pesticides,
resurgence
of major pests and
accumulation of residue in the environment
Biotic + Abiotic Factor =
Natural Control
the GEP of the
pest is always above the
ETL; sometimes called
“major pest”, perennial pest
or severe pest
Key Pest
the GEP
of the pest is usually below
the ETL and rarely crosses it;
sometimes called “sporadic
pest” or secondary pest
Occasional Pest
the GEP of
the pest is always below the
ETL; also called sub
economic pest or non-pest
Potential Pest
Example of Pest characteristics
-Competitiveness/voracity
-Rapid growth and development
-Rapid increase in abundance
-Destructiveness to yield
-Ubiquity (very common)
movement and exchange of
organic and inorganic
matter back into the
production of matter
Nutrient cycles/
Biogeochemical cycles
- the ecological role of the
organism
Ecological Niche
Process of change in the
species structure of a
community over a long
period of time
Community Succession
the characteristic of a system as a
result of the interrelationship
of its components; Each
component does not possess
it.
Emergent Property
the measure
of efficiency expressed as the
net amount of a valued
output per unit of input. In
agriculture, this is commonly
referred to as yield.
Productivity
the number of
species conventionally. It also
refers to heterogeneity of
genes and variations of
functional role of a group of
species.
Diversity
the constancy of
productivity in response to
small disturbances caused by
the normal fluctuations of the
surrounding environment
Stability
ability to
maintain productivity in spite
of major disturbance in the
environmen
Sustainability
four basic ecological
processes that affect a
population
immigration,
emigration,
natality
and
mortality
