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Arthropods, 2017, 6(2): 67-77
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Article

Side effects of thiacloprid+deltamethrin, pirimicarb and pymetrozine on the black bean aphid parasitoid, Lysiphlebus fabarum Marshall (Hymenoptera: Aphidiidae)

Ardavan Mardani1, Ali Almasi2, Seyed Mehdi Hashemi3, Majid Mohammadnejad4
1Young Researchers and Elite Club, Marvdasht Branch, Islamic Azad University, Marvdasht, Iran
2Department of Plant Protection, College of Agriculture, Shahid Chamran University of Ahvaz, Ahvaz, Iran
3Young Researchers and Elite Club, Ardabil Branch, Islamic Azad University, Ardabil, Iran
4Department of Plant Protection, College of Agriculture, University of Tehran, Iran

Received 1 January 2017;Accepted 8 February 2017;Published 1 June 2017
IAEES

Abstract
Lysiphlebus fabarum Marshall is the main parasitoid of the black bean aphid, Aphis fabae Scopoli. Lethal and sublethal effects of thiacloprid+deltamethrin, pirimicarb and pymetrozine were evaluated on the parasitoid under laboratory conditions. Newly emerged females were exposed to dry insecticide residues that were applied on glass plates. Thiacloprid+deltamethrin caused 100% mortality. Pirimicarb produced significant mortality and adverse effects on fecundity, while pymetrozin did not. According to the IOBC (International Organization of Biological Control) standards, thiacloprid+deltamethrin (E = 100%), pirimicarb (E = 62.70%) and pymetrozine (E = 11.86%) were classified as harmful, slightly harmful and harmless, respectively. Life table assays revealed that intrinsic rate of natural increase (rm) inthiacloprid+deltamethrin (50%) and pirimicarb (12%) were significantly reduced compared to the control group, while pymetrozine had no such effects. Our results showed that pymetrozine was safe for L. fabarum, but pirimicarb and thiacloprid+deltamethrin had deleterious effects on this parasitoid. In sum, the present study suggests a relative compatibility between pymetrozine and L. fabarum.

Keywords ecotoxicology;IOBC;insecticide;life table parameters.


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