Compatibility of a Bt Srain of High Virulence against Bradysia odoriphaga Larvae with Commonly Used Chemical Pesticides

doi:10.16409/j.cnki.2095-039x.2017.06.004

Abstract

Abstract: The compatibility of a Bt strain JQD117 showing high virulence against Bradysia odoriphaga larvae with commonly used chemical pesticides was investigated in terms of pesticide effect on spore germination, growth and virulence of the Bt strain. Test results showed that at high, mediate and low concentrations of the pesticides, the strain could germinate at rates not significantly different from that in the control, and showed no significantly different virulence compared with the blank control. When exposed to the routine application concentrations of the chemical pesticides, the strain produced similar number of living bacteria with the strain on LB medium. When the JQD117 was mixed with imidacloprid, chlorfluazuron, chlorfenapyr, thiacloprid and beta cypermethrin at low dose, the mixture showed virulence of obvious additive effect; and when the strain was mixed with dinotefuran and clothianidin at low dose, the mixture showed obvious synergy effect. When mixed with clothianidin, dinotefuran, chlorfenapyr at low dose for 3 d, the mixture resulted in adjusted mortalities in B. odoriphaga of 95.45%, 90.91% and 90.91%, respectively. Thus, the Bt strain JQD117 has good compatibility with chemical pesticides at routine application concentrations. This research provides prospect for reducing pesticide inputs and safety production.

Key words: Bacillus thuringiensis, chemical insecticides, Bradysia odoriphaga, compatibility

CLC Number:

S482.3

SONG Jian, CAO Weiping, DU Lixin. Compatibility of a Bt Srain of High Virulence against Bradysia odoriphaga Larvae with Commonly Used Chemical Pesticides[J]. journal1, 2017, 33(6): 739-746.

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