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Importance of Experimental Observation

Hind-Lanoiselet et al. (2004, 2006) demonstrated the importance of rainfall distribution in relation to disease development, having observed that in years with low rainfall and high temperatures Sclerotinia rot is not a limiting factor for crop development. In such years the application of fungicide had impact on early disease but no ultimate impact on yield (Figure 16.3). Such findings suggest that in similar years finances can be directed away from this problem to be used more productively in other areas, with the proviso that this practice is not rigidified so as to prevent successful financial re-targeting in subsequent growing seasons.

Desirable level of complexity

A management tool should only include easily obtained information and results should be relatively simple for the user to interpret. Complex tools based on advanced modeling need to clearly communicate the data for general stakeholder use. tte economic component needs to be included as part of a risk-benefit framework which only encourages the use of fungicide when it is likely to enhance profitability.

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Fig. 16.3. Incidence of S. sclerotiorum at 20% flowering on canola petals and disease incidence before harvesting after a dry finish at a trial in Wallendbeen in 2003.

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