13 Disease development in plant populations - Copy

13 Disease development in plant populations - Copy - PP 315...

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PP 315 / 590J  Lecture 13 Disease development in plant populations: Agroecosystems vs Natural ecosystems Ecosystem  – smallest ‘functional' unit; an ecological community (organisms and their environment)  considered to function as a unit; independent via interdependence  Agriculture exists as a type of ecosystem –  agro-ecosystem   Natural ecosystems progressively evolve (change), but this change is gradual because of the stability of  the ecosystem, which is made possible because of its diversity. Do plant diseases occur in natural ecosystems? Yes, but over a long time period, may either cause less  damage than diseases in agroecosystems, or we are not as concerned about a low to moderate level of  disease in a group of plants we are not trying to obtain some type of economic return from. You should know of the concept of succession; organisms modify their own environment and other 
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13 Disease development in plant populations - Copy - PP 315...

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