Published in Scientific Papers. Series A. Agronomy, Vol. LXI, Issue 1
Written by Erhan KOÇAK, Abdullah YILMAZ, Y. Nazım ALPKENT, Serdar BİLGİNTURAN
Rusty grain beetle Cryptolestes ferrugineus (Coleoptera: Laemophloeidae) is one of the most important pests of stored grains. It is known that long term use of phosphine against the pests causes to resistance development in the pests. In this study, 16 C. ferrugineus populations from grain warehouses of 11 provinces were collected. The resistance to phosphine of the populations was determined by modifying the FAO method to obtain LC50 values. Resistance ratios were calculated by comparing the LC50 values of the populations to the LC50 value of the sensitive population. The C. ferrugineus population obtained from İzmir province died at 36 ppm discriminating dose and LC50 value was calculated as 16.82 ppm/20 hrs. This population was considered susceptible and used in LC50 comparisons to determine the resistance ratios. The LC50 was not calculated for the six populations which died at the discriminating dose. In the 10 populations which LC50 were calculated, resistance ratios were found between 3.0 and 392.6 times. According to the results, phosphine resistance of C. ferrugineus was common and generally high in Turkish populations.
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