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Reciprocal crossing of the Mt Alford (A) strain of the cattle tick B .. micro pius with a susceptible (8) strain and phenotype analysis of F 1, testcross and F 2 progeny showed that high chlorpyrifos resistance in strain A was due to two genes that were complementary and jointly exhibited incomplete dominance. Diazinon resistance in the Gracemere (G) strain appeared to be similarly inherited. The 'average' degree of dominance ('average dominance', D ?? ) of high chlorpyrifos resistance over susceptibility, exhibited by F 1 hybrids from A x 8 reciprocal crossings, was + 054 on a -1 to + 1 scale and was not significantly different from the parametric value of + O' 5 (semi-dominance). The corresponding D ?? values revealed by G x 8 crossings were + 042 for diazinon resistance (significantly less than +0'5) and -0,031 for chlorpyrifos resistance (not significantly different from zero and therefore exhibiting zero dominance/recessivity). Resistance factors for chlorpyrifos in strains A and G forhomozygotes were 74 and 35, respectively, and for F1 hybrids were 25-29 and 5-7, respectively. The resistance factors for diazinon in strain G for homozygotes and F1 hybrids were 174 and 37-41, respectively.

Inheritance of Resistance to Chlorpyrifos in the Mt Alford Strain and to Diazinon in the Gracemere Strain of the Cattle Tick (Boophilus micro plus)