Agriculture Reference
In-Depth Information
based on the result of numerous field experiments and experience. It was a series of
decision algorithms and was published in the form of wall charts. This had the
advantage that it involved no computing but, like EPIPRE, depended for its success on
field observations made by farmers or their consultants who then went through a
decision tree (Fig. 9.3). The one devised for barley yellow dwarf virus (BYDV) was
modified for videotext and included region risk factors for each season. The videotext
version was discontinued in the mid-1980s with the demise of one of the carriers
dedicated to on-line farm information and remains to be developed into a PC
programme (Foster
et al
., 2004). However, with the increased use of computers on the
farm some schemes have moved to CD-Rom and Web-based systems.
Figure 9.3. Managed disease control for spring barley mildew (Redrawn from Anon., 1986).
