Agriculture Reference
In-Depth Information
The relationship between disease assessment and crop loss has always presented
problems to the plant pathologist, who has traditionally relied on empirical yield loss
models. These have no mechanistic link to the productivity of the host plant. Bryson
et al
. (1995)
suggested a yield loss model for yellow rust of wheat based on loss of
green leaf area and changes in canopy light interception. Such a model is therefore
based on crop function and utilizes crop physiological variables rather than
measurements of disease; this and other developments such as incorporating spatial
patterns into crop loss models (Hughes, 1996) have changed our understanding of
the disease-yield loss relationship. It will be important in the future to validate new
individual loss models and to compare alternative models for describing disease-
yield loss relationships.
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