Comparison of average population displacement of Heterorhabditis bacteriophora and Steinernema carpocapsae in the presence and absence of mobile and non-mobile hosts.

Average (±SE) population displacement (cm/day) of infective juveniles (IJs) of Heterorhabditis bacteriophora and Steinernema carpocapsae dispersed to 2 cm wide annuli at all three distances, 3.8, 7.6 and 11.4 cm over a period of 12 to 72 hr in the presence and absence of mobile and non-mobile hosts in the microcosms containing autoclaved field soil with vegetation. Quadratic regression lines fitted for the average population displacement of IJs of each of the two species dispersed in the presence and absence of mobile and non-mobile hosts are bracketed. Double asterisk (**) indicates the significant difference in the estimated linear and quadratic coefficients between the two species, horizontally and the type of host (mobile vs non-mobile) within a species, vertically (from regression analyses, P ≤ 0.05). Analysis of variance indicates significant difference in the average population displacement of a species in the presence and absence of mobile and non-mobile hosts at P ≤ 0.05.Comparison of average population displacement of Heterorhabditis bacteriophora and Steinernema carpocapsae in the presence and absence of mobile and non-mobile hosts.