Choose between two types of beneficial nematodes Steinernema Carpocapsae nematodes (SC) or Heterorhabditis bacteriophora (HB) nematodes Steinernema Carpocapsae nematodes (SC) are most effective against flea larvae, ticks, ants, and caterpillars in lawns, garden soil, and under trees where larvae pupate. S. carpocapsae tends to be most effective when applied against highly mobile surface-adapted insects. Heterorhabditis bacteriophora (HB) nematodes are most effective against Weevils, Beetle grubs, Japanese beetle, Masked chaffers, MayJune beetles, Black vine weevil, various white grubs, Banana weevil, Bill bug, Colorado Potato beetle, Cucumber beetle, Sweetpotato weevil, Asparagus beetle, Carrot weevil, Banana moth, Citrus root weevil group, Sugarcane stalk borer, Various tree and vine borers, Bagworms, Flea beetle, Flea, and all types of grubs. NATURES BEST WAY OF KILLING Grubs and Japanese Beetles.