I have been reading several articles on nematode life-history for my insects class. Several articles say that Entomopathogenic nematodes(EPNs) are the only nematodes possessing an "optimal balance of biological control attributes". What does this mean?
It is a long-winded way of saying that these are the only nematode genera that are useful for biological control. In particular the article is referring to Steinernema and Heterorhabditis, both of which genera are used for control of some pest insects.