Effects of four plant secondary compounds on the resistance to the trichlorphon-resistant strains of Bactrocera dorsalis(Hendel)
To clarify the effects of the plant secondary compounds on the resistance of Bactrocera dorsalis(Hendel)to insecticides,the laboratory trichlorphon-resistant strain of B.dorsalis was took as a research object in this paper,and the different doses of rutin,quercetin,2-tridecanone,and tannic were used to feed the adults and larvae of that strain for three generations continuously.The toxicity of the trichlorphon to B.dorsalis was determined by the film method,and the resistance multiple(Rm)and the growth rate of resistance(GR)were calculated on the toxicity.The relationship between the kind,dose of the plant secondary compounds and the development of insecticide resistance in B.dorsalis were analyzed and clarified.The results showed that the higher concentration of rutin among the four plant secondary compounds enhanced the resistance of B.dorsalis to trichlorphon significantly,and the overall trend of the greater enhancement degree of resistance was shown in treating more generations.After treated with 0.05％and 0.25％rutin,the resistance multiples in the F,generation were 198.05 and 172.13,respectively,significantly higher than that of the control(110.61),and the growth rate of resistance was 1.79 and 1.56,respectively.At 0.01％,0.05％,and 0.25％dose treatments,the resistance multiples of the F2 generation increased from 89.49 in control to 137.20,146.38,and 171.48,respectively,and their growth rates of resistance were 1.53,1.64,and 1.92,respectively.Under 0.01％,0.05％,and 0.25％dose,the resistance multiples of F3 generation increased from 61.33 in control to 128.12,137.23,and 211.36,respectively,and their resistance growth rates increased significantly(2.09,2.24,and 3.45).Some concentrations of tannic treatments enhanced or reduced the resistance to trichlorphon of B.dorsalis.The growth rate of resistance was 1.60 in F1 generation treated with 0.002％,whereas the growth rates of resistance decreased to 0.68,0.70,and 0.67,respectively,at F2 generation treated with 0.25％,and F3 generation treated with 0.05％,0.25％.Quercetin and 2-tridecanone treatments with all test concentrations for three generations had no significant effect on the resistance to trichlorphon of B.dorsalis.The study revealed that some plant secondary compounds could have positive or negative effects on the insecticide resistance of B.dorsalis,and their effects were related to the type,concentration,exposure time,etc,of those compounds.
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