Journal of Food, Agriculture and Environment
Vol 8,
Issue 1,2010
Online ISSN: 1459-0263
Print ISSN: 1459-0255
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The activity of three new strains of Steinernema feltiae against adults of Sitophilus oryzae under laboratory conditions
Author(s):
Žiga Laznik 1,
Tímea Tóth 2, Tamás Lakatos 2, Matej Vidrih 1, Stanislav Trdan 1*Recieved Date: 2009-10-17, Accepted Date: 2009-12-22
Abstract:The efficacy of three new strains (B30, B49 and 3162) of the entomopathogenic nematode Steinernema feltiae in controlling rice weevil (Sitophilus oryzae) adults was tested in a laboratory bioassay. The aim of the study was to determine the activity of selected biological control agents against one of the most important primary stored product pests to prevent the occurrence of rice weevil resistance to insecticides. The pathogenicity of biological agents was studied at four different temperatures (15, 20, 25 and 30ºC) and for five concentrations of nematode suspension (125, 250, 500, 1000 and 2000 IJs per adult). Beetle mortality was determined on 4, 6 and 8 days after treatment. The results showed that all studied strains were most pathogenic (42-72% mortality) at 25ºC and the highest concentration of the nematode suspension, while the lowest pathogenicity (from 6 to 11%) was found at 30ºC and the lowest concentration of the nematode suspension. Besides, at higher concentrations the suspension of entomopathogenic nematodes can be an effective biological agent in controlling adult rice weevils. The lowest LC50 value (1165 IJs/adult after an 8-day exposure) was obtained for the Hungarian strain 3162 at 25ºC, while the highest (2533 IJs/adult after an 8-day exposure) was obtained for the Slovenian strain B30 at 30ºC.
Keywords:Biological control,
entomopathogenic nematodes, Steinernema feltiae, rice weevil, Sitophilus oryzae, strainsJournal: Journal of Food, Agriculture and Environment
Year: 2010
Volume: 8
Issue: 1
Category: Agriculture
Pages: 150-154
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