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A Chinese version of expert consultation system for IBM
compatible personal computer for the diagnosis and managment of
diseases on grapevine was established using C-language of
Borland International Co.. The system contains guideline infor-
mations for the identification of a total of 39 grapevine di-
seases which include 1 nematode, 13 fungal, 7 viral and 18 phy-
siological diseases or disorders. The contained informations
were shownon the monitor screen by the following six main cate-
gories: 1, an index sector for tracking the consulted disease;
2, a computer guided inference-path sector for disease diag-
nosis; 3, a knowledge bank sector for the disease management
including metods for chemical and/or non-chemical controls;4,
an editorial sector for the user-manipulatable corrections or
imput of new knowledge basis for either disease diagnosis or
management; 5,a data output sector for the print-out or demon-
stration of informations in the knowledge bank which include
disease control methodologies and color pictures of disease
symptoms; and 6, a system support sector for general computer
aids as well as an inquiring telephone lists for available
grapevine disease experts around the country. In the computer-
guided disease diagnosis sector, an"if--then--else" based
backward-chaining inference model was followed for the
stepwise identification of an unknown target disease using
obser-vable symptom characteristics on plant host as the main
criteria. And for the operation of this inference machinery, a
total of 424 guiding rules which were grouped into 21 routines,
were constructed in the knowledge bank on the basis of
distinctive symptom characteristics of grapevines at bud break,
full growth, fruiting, as well as harvesting and postharvest
stages. Also asadditional aid for the disease diagnosis, 30
color picturesed from various sources are available in the data
output
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