Development of diamondback moth strains resistant to dimehypo and cartap with reference to the mechanism of resistance
1993
REP.DBM-1552
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Title
Development of diamondback moth strains resistant to dimehypo and cartap with reference to the mechanism of resistance
Publication Date
1993
Call Number
REP.DBM-1552
Summary
Diamond-back moth (Plutella xylostella) larvae in fourth instar were topically applied with dimehypo and cartap in seccessive generations in the laboratory to develop resistant strains of the moth. After 35 generations, the resistance of the moth to dimehypo and cartap increased by 51 and 25 folds, respectively. The time course of resistance development appeared to be in S shape. The sensitivities of the dimehypo-resistant and cartap-resistant strains to 11 insecticides were tested. The results showed that the resistant strains had marked positive cross-resistance to dimehypo, cartap and thiocydam and slight positive cross-resistance to DDVP, malathion and fenitrothion, but showed negative cross-resistance to deltamethrin, cypermethrin, permethrin, methomyl and thiofonox. PAGE demonstrated that the resistance to insecticides was related to the activity of special types of esterase. Activities of CarE and AchE were measured by colorimetry and acidity analysis. The results indicated that in the resistant strains the AchE activity decreased, but the CarE showed no difference in activity. Topical application of the synergist Pb or Sv1 to the fourth instar larvae would increase their sensitivity to the insecticides, the synergism in dimehypo-resistant strain was 6.28 times for Pb and 1.45 for Sv1, and in the cartap-resistant strain 4.85 and 1.39 times, respectively. It seems that MFO is an important factor for the moth to resist dimehyp and cartap. [AS]
Journal Citation
v.36(4):409-418, ACTA ENTOMOLOGICA SINICA
Contact Information
harvest@worldveg.org
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Research > Published Articles