Testing the efficacy of entomopathogenic nematodes (Rhabditida) against larvae and adults of colorado potato beetle (Leptinotarsa decemlineata Say, Coleoptera, Chrysomelidae) | Preucevanje ucinkovitosti entomopatogenih ogorcic (Rhabditida) za zatiranje licink in odraslih osebkov koloradskega hrosca (Leptinotarsa decemlineata Say, Coleoptera, Chrysomelidae)
2007
Trdan, S., Ljubljana Univ. (Slovenia). Biotechnical Fac., Agronomy Dept. | Valic, N. | Milevoj, L.
Four entomopathogenic nematode species (Steinernema feltiae, S. carpocapsae, Heterorhabditis bacteriophora, and H. megidis) were tested in a laboratory bioassay studying the efficacy of these parasites in controlling the larval and adult forms of the Colorado potato beetle (Leptinotarsa decemlineata). The activity of these biological agents was assessed at three different temperatures (15, 20, and 25 deg C) and three concentrations (200, 1000, and 2000 infective juveniles per individual). Mortality levels at three developmental stages (young larvae, old larvae, and adults) was determined 2, 4, and 7 days after treatment. At 15 deg C entomopathogenic nematodes showed the lowest efficacy and the slowest activity on all three developmental stages of the pest. However, when controlling overwintered adults for the purpose of preventing the mass appearance of Colorado potato beetle, we recommend an application of S. feltiae suspension at higher concetrations. No significant differences in efficacy of entomopathogenic nematodes in controlling different developmental stages of larvae were determined at 20 and 25 deg C, yet all nematodes caused prompt death of their victims at these higher temperatures. At all temperatures young larvae were the most sensitive to the attack of entomopathogenic nematodes; therefore we recommend larval control by these biological agents, in cases where the application of these methods can be economicaly justified.
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