Rev. 01/01/20
Definitions:
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An organism that feeds on another living organism. |
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An organism causing disease or harm, or detrimental to healthy development; note that pathogenesis not necessarily of adaptive advantage to a parasite. |
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A plant can be considered healthy and normal when able to carry out its physiological functions at or near the upper limit of its genetic potential, including
Disruption of these processes is the diseased state. However, health and disease are not absolutes. |
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There is an optimal range for each life process, and the processes oscillate about the optimum within limits promoting normal development and growth rate Sorauer (1908). |
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A wider concept. |
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Between latitudes of health and life - development arrested or regresses. |
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A condition rendering a plant more susceptible or less tolerant of a disease - past and present biotic and abiotic stress (Sorauer,1908).
Note: this concept, proposed in the era of the "doctrine of specific etiology", was somewhat radical thinking . |
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