Acta Entomologica Sinica (2000) 43, 346-355

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Cheng-Song Wan, Xiu-Lian Sun and Guang-Yu Zhang (2000)
Synergism of Helicoverpa armigera nucleopolyhedrovirus in combinations with chemical insecticides and lecithin
Acta Entomologica Sinica 43 (4), 346-355
Abstract: Third-instar larvae of Helicoverpa armigera were fed on artificial diet mixed with combinations of H. armigera nucleopolyhedrovirus (HaNPV ) and insecticides cyhalothrin, deltamethrin, esfinualerate, mijinthrin, methomyl, phoxim, methylparathion and acephate respectively. Mortalities were observed, and LC50 values and the synergic ratio were determined. The activities of three enzymes (Mixed-function oxidase, MFO; Carboxylesterase, CarE; Acetylcholinesterase, AChE) in relation to the pest resistance to insecticides were also detected. In addition, enhancement of HaNPV infectivity by soybean lecithin was revealed. The results showed that combination of HaNPV and each of the insecticides was more effective than HaNPV or insecticides alone, all the synergic ratios were more than 1.0, especially synergic ratio of HaNPV-methyl-parathion treatment arrived at, 3.53. The activities of MFO in resistant H. armigera larvae treated with mixtures of HaNPV and insecticides decreased 3 - 27 times as compared to insecticide treatments alone. The activities of CarE and AChE in the resistant larvae treated with the mixtures were lower than that with insecticides alone as well. NPV inhibited the increase of MFO and CarE activity induced by insecticides. Lecithin enhanced the infectivityof HaNPV against H. armigera larvae, the LT50 value of HaNPV was shorten when the lecithin was combined.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)
(original language: Chinese)


Research topic(s) for pests/diseases/weeds:
biocontrol - natural enemies
Research topic(s) for beneficials or antagonists:
formulation/storage of bioagents


Pest and/or beneficial records:

Beneficial Pest/Disease/Weed Crop/Product Country Quarant.


Helicoverpa armigera
Helicoverpa armigera nucleopolyhedrovirus (entomopathogen) Helicoverpa armigera