The toxicity of phosphine to adults of Tribolium castaneum (Herbst): Time as a dosage factor
1984; Elsevier BV; Volume: 20; Issue: 1 Linguagem: Inglês
10.1016/0022-474x(84)90035-3
ISSN1879-1212
Autores Tópico(s)Insect Resistance and Genetics
ResumoThe mortality response of adults of Tribolium castaneum (Herbst) to phosphine was examined over a range of fixed concentrations from 0.0011 to 51.0 mg/l. From 0.005 to 0.5 mg/l, a probit plane without interaction provided a satisfactory description of this response. A Ct relationship, C0.9t = k, provided a better description of toxicity than similar models incorporating thresholds of time and concentration. At concentrations greater than 0.5 mg/l, insects became narcotised and were partially protected from the effects of phosphine. A bimodal tolerance distribution was evident and the tolerance of beetles increased with increasing concentration. Problems associated with the examination and interpretation of Ct relationships are discussed. An explanation is provided of differences in the phosphine toxicity data reported in the literature.
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