Hb Ranch - Small NemaSeek Heterorhabditis bacteriophora Nematodes - 250 milBest Choice For Beetle Grub Control! NemaSeek Beneficial Nematodes, Heterorhabditis bacteriophora, actively seek out pest insects in the soil. Beneficial Nematodes are live microscopic organisms (non segmented round worms) that naturally occur in soil throughout the world. The beneficial nematodes we sell are parasitic to insect pests that typically have a developing (larval or pupal) stage of life in the soil. They have been known to parasitize above