Resistance of Tribofium castaneum to Phosphine and the Relationship between Complete Lethal Concentration and Exposure Time of Phosphine in Hainan Province

摘要

[Objective] The paper was to investigate the resistance of Tribolium castaneum to phosphine in Hainan Province. [Method] Using the measurement method of phosphine resistance of stored grain pests recommended by FAO,the phosphine resistance of eight strains of T. castaneum adults in Hainan Province was determined. [Result] The resistance coefficients of different strains of T. castaneum against phosphine ranged from 612 to 1 045,and all strains reached extremely high resistance level( Rf > 160). When the concentration of phosphine was 200 mL/m^3,Rf612,Rf826. 4 and Rf1045 strains had complete lethal time of 8,9 and 11 d,respectively. [Conclusion] T. castaneum in Hainan Province had very strong resistance to phosphine,and the operation scheme of low concentration and long duration should be adopted in elimination of T. castaneum.