Abstract
In South Africa, after harvest and prior to the winter months, when the entire codling moth population enters diapause, no control measures are applied in apple and pear orchards. The biocontrol potential of three imported entomopathogenic nematode (EPN) isolates, being Steinernema feltiae and two isolates of Heterorhabditis bacteriophora (Hb1, Hb2), as well as a local isolate, S. yirgalemense, were evaluated for the control of codling moth under local conditions. All concentrations of S. yirgalemense, applied by immersion in a suspension of nematodes, gave >98 % control. The in vivo-produced S. yirgalemense resulted in codling moth control of >90 %, compared to 54 % and 31 % control by the H. bacteriophora Hb1 and Hb2 isolates, respectively. In follow-up field trials, S. feltiae resulted in ³80 % control, and was more effective than both the S. yirgalemense and the H. bacteriophora (Hb1) isolates. To validate the data obtained from the field trials, subsequent laboratory bioassays were conducted evaluati...
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