caa a22 4500 38639928X CHVBK 20180307112152.0 cr unu---uuuuu 161130e198908 xx s 000 0 eng 10.1017/S0031182000061047 doi S0031182000061047 pii (NATIONALLICENCE)cambridge-10.1017/S0031182000061047 Infective juvenile formation in the insect parasitic nematode Steinernema feltiae [Elektronische Daten] Steinernematid nematodes form a developmentally arrested infective juvenile (IJ) stage at the second moult, when conditions inside the insect host are no longer suitable for further reproduction. In a liquid culture micro-assay two environmental cues were shown to influence the formation of Steinernema feltiae IJs. High nematode population density induced IJ formation, suggesting the presence of a nematode pheromone. Bacterial food and soluble nutrients acted competitively to reduce the frequency of IJ formation. Frequency of IJ formation was greatest when lst-stage juveniles were subjected to IJ-inducing conditions. The optimum temperature range for the IJ induction response was 25-30°C. These findings suggest that maximal IJ production in large-scale liquid culture will depend on the correct balance of nematode population density and nutrient availability at the peak of egg hatching. Copyright © Cambridge University Press 1989 Steinernema feltiae nationallicence development nationallicence infective juveniles nationallicence liquid culture nationallicence Popiel Irene Biosys, 1057 East Meadow Circle, Palo Alto, CA 94303, USA Grove Donna L. Biosys, 1057 East Meadow Circle, Palo Alto, CA 94303, USA Friedman M. J. Biosys, 1057 East Meadow Circle, Palo Alto, CA 94303, USA Parasitology Cambridge University Press 99/1(1989-08), 77-81 0031-1820 99:1<77 1989 99 PAR https://doi.org/10.1017/S0031182000061047 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1017/S0031182000061047 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Popiel Irene Biosys, 1057 East Meadow Circle, Palo Alto, CA 94303, USA NATIONALLICENCE 700 1- Grove Donna L. Biosys, 1057 East Meadow Circle, Palo Alto, CA 94303, USA NATIONALLICENCE 700 1- Friedman M. J. Biosys, 1057 East Meadow Circle, Palo Alto, CA 94303, USA NATIONALLICENCE 773 0- Parasitology Cambridge University Press 99/1(1989-08), 77-81 0031-1820 99:1<77 1989 99 PAR CC0 http://creativecommons.org/publicdomain/zero/1.0 nationallicence SWISSBIB 386398984 BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-cambridge