Bahram Faridi1; Ali Asghr Pourmirza1; Mohammad Hossien Safaralizadeh1 and Mohammad Vali Taghaddosi2 | ||||
| Egyptian Academic Journal of Biological Sciences. A, Entomology | ||||
| Article 5, Volume 4, Issue 2, December 2011, Page 39-46 PDF (101.7 K) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/eajbsa.2011.15163 | ||||
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| Authors | ||||
| Bahram Faridi1; Ali Asghr Pourmirza1; Mohammad Hossien Safaralizadeh2; Mohammad Vali Taghaddosi3 | ||||
| 1Department of Entomology, Faculty of Agriculture ,Urmia University, Urmia, Iran | ||||
| 2Department of Entomology, Faculty of Agriculture ,Urmia University, Urmia, Ir | ||||
| 3Department of Entomology, Agricultural and Natural Resources Research Center of Zanjan | ||||
| Abstract | ||||
| The food consumption pattern of Colorado potato beetle larvae revealed that the food intake increased exponentially with larval age, with the penultimate and ultimate instars larvae consuming18 and 73% of the total, respectively. Different larval stages of Colorado potato beetlewere treated by different doses of Bcillus thuringiensis Berliner var. tenebrionis under laboratory conditions to determine larval susceptibility to this bioinsecticide. The results indicated that in terms of LD50 values younger larvae were more susceptible to the B. thuringiensis than older instars. LD50 values estimated from the collected data indicated a different pattern of susceptibility of larvae to B.t. for different larval stages, as evidenced by non overlapping confidence intervals of relative median potency estimates The LT50 values showed that the speed of larval death depends on the larval age and B. thuringiensis dose. It was concluded that, if the pattern of food consumption and susceptibility in the present study was used as a model of larval food intake and susceptibility under natural conditions, the larvae must be killed prior to penultimate instar. | ||||
| Keywords | ||||
| feeding activity; frass production; Bioassay; lethal dose (LD50); Bacillus thuringiensis | ||||
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