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Abstract
This work presents an expert system that gives recommendations to extensions and growers for managing the pests by biological, chemical and agricultural operations. The main goal of this work is to minimize the pesticides used in controlling the pests. The problem is that, when a certain crop is affected by many pests, the chemical operations may contain some pesticides for controlling some pests, in spite of the effect of these pesticides is the same and can be abstracted to one pesticide. The abstraction can be achieved by one of two methods, the first method is adapting the domain knowledge representation to achieve the abstraction, the ”second method is establishing an algorithm and using a simple knowledge representation. The first method make the knowledge representation is more complicated and difficult during development. This work uses the second method because it simplifies the domain knowledge representation and is more accurate. This expert system can be used for many crops after adding the domain knowledge for the underline crop. The algorithm -is the same for all crops. This work has been applied on fababean crop and gives good..