Abstract
Most populations of nematodes are probably under ‘natural’ control and, in several soils, microbial agents have been shown to provide longterm control of pest species (Kerry,1987; Stirling, 1991). However, nematologists are still some way from manipulating these organisms with treatments that are practical for a grower. Despite much research on the biological control of many soil-borne bacterial and fungal diseases, only two agents have proved successful in practice and none has been developed that will protect the root system throughout a growing season (Deacon, 1991). However, more agents with different modes of action are currently being studied by more research workers than ever before and significant progress is being made. Research on the biological control of nematodes has moved from an empirical observational discipline to one in which quantitative studies on the interrelationships between pest, agent and plant are undertaken and detailed studies on the mode of action of various agents are made. As a consequence, there are more grounds for optimism than in the past (Sayre and Water, 1991).
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