Susceptibility of the cockroach Periplaneta americana to Heterorhabditis heliothidis (Nematoda: Rhabditoidea) in the laboratory

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Abstract
Under ideal exposure conditions, the nematode Heterorhabditis heliothidis (strain T327) killed members of all instars of the cockroach Periplaneta americana. Mortality was greatest in young instars and decreased with host age such that few larger nymphs or adults were killed. Infection led to the production of dauer juveniles in young cockroaches. In some adult cockroaches, nematode death in the haemocoel was due to encapsulation and melanization.