Toxicity of three insecticides to Lysiphlebus fabarum, a parasitoid of the black bean aphid, Aphis fabae
1Department of Plant Protection, College of Agriculture, University of Tehran, Daneshkade St, Karaj, Iran
2Department of Plant Protection, College of Agriculture, Shahid Chamran University of Ahvaz, Ahvaz, Iran
3Kansas State University, Agricultural Research Center – Hays, 1232 240th Ave, Hays, KS 67601, USA
Abstract
The toxicity of three insecticides to Lysiphlebus fabarum (Marshall) (Hymenoptera: Braconidae: Aphidiinae), a parasitoid of Aphis fabae Scopoli (Hemiptera: Aphididae), was investigated using IOBC/wprs protocols. Abamectin 1.8 EC, imidacloprid 350 SC, and pymetrozine 25 WP were tested under laboratory conditions at recommended field rates. Immature stages of the parasitoid were exposed to materials by briefly dipping mummified aphids into insecticide solutions/suspensions or water (controls). Abamectin, imidacloprid, and pymetrozine caused 44.8, 58.5, and 14.5% mortality of mummies, respectively. Insecticides were also applied to broad bean foliage until run-off using a hand sprayer and the contact toxicity of residues was investigated after 1, 5, 16 and 30 day periods of outdoor weathering by caging adult wasps on treated plants for 24 h. One day-old residues of abamectin, imidacloprid, and pymetrozine produced 52.5, 90.0 and 57.0% mortality, respectively, and 5 day-old residues produced 28.1, 77.0 and 18.6% mortality. Sixteen day-old residues produced 8.8, 22.4 and 13.6% mortality, whereas 30 day-old residues produced 0.0, 3.2 and 1.1% mortality, respectively. On the basis of these results, abamectin and pymetrozine were classified as short-lived compounds (Class A) and imidacloprid as a slightly persistent compound (Class B).
Keywords: abamectin, imidacloprid, persistence, pymetrozine, Vicia faba
Correspondence:
a Sabahi@ut.ac.ir,
b Arashrasekh@gmail.com,
c jpmi@ksu.edu
Editor: T.X. Liu was Editor of this paper.
Received: 16 September 2010 | Accepted: 4 December 2010 | Published: 22 August 2011
Copyright: This is an open access paper. We use the Creative Commons Attribution 3.0 license that permits unrestricted use, provided that the paper is properly attributed.
ISSN: 1536-2442 | Volume 11, Number 104
Sabahi Q, Rasekh A, Michaud JP. 2011. Toxicity of three insecticides to Lysiphlebus fabarum, a parasitoid of the black bean aphid, Aphis fabae. Journal of Insect Science 11:104 available online: insectscience.org/11.104
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