Entomopathogens as biological control agents are receiving a great deal of attention for the following reasons: they provide environmentally safe insect control; they can be engineered genetically, thereby changing their pathogenicity and persistence (Bonning and Hammock,1996.);(30) some of the proteinaceous toxins they produce can be transferred to and expressed in crop plants or other microorganisms (Raichon et al.1994)(31); or they can be used as inundative or inoculative biological agents. The use of most entomopathogens has focused on above ground pests. Yet, 90 percent of the pest species have one or more life stages in the soil (Klein,1990)(32). Several entomopathogens (e.g., Bacillus popilliae, B.thuringiensis subsp.japonensis Buibui strain,Beauveria spp.,Metarhizium spp.) are available for the control of soil dwelling pests, but to date the most successful have been the entomopathogenic nematodes.

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