Know the right nematode for the job Just as turf managers must select the appropriate chemical insecticide to control a specific insect, you must match nematodes with the pests they are most prone to attack. Turf insect target Nematode species Armyworms Steinernema carpocapsae Bill bugs S. carpocapsae, Heterorhabditis bacteriophora Cutworms S. carpocapsae Mole crickets S. riobravis Web worms S. carpocapsae White grubs H. bacteriophora