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Acute toxicity and sublethal effects of the neonicotinoid imidacloprid on the fitness of Helicoverpa armigera (Lepidoptera: Noctuidae)

Published online by Cambridge University Press:  27 September 2013

Salman Ahmad ,
Mohammad Shafiq Ansari  and
Nadeem Ahmad
Salman Ahmad*
Affiliation:
Department of Plant Protection, Faculty of Agricultural Sciences, Aligarh Muslim University, Aligarh202 002, India
Mohammad Shafiq Ansari
Affiliation:
Department of Plant Protection, Faculty of Agricultural Sciences, Aligarh Muslim University, Aligarh202 002, India
Nadeem Ahmad
Affiliation:
Department of Plant Protection, Faculty of Agricultural Sciences, Aligarh Muslim University, Aligarh202 002, India
*
*E-mail: [email protected]
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Abstract

The fitness of Helicoverpa armigera (Hübner) was determined using demographic studies on the F1 generation that survived after exposure to four sublethal doses (LC50, LC30, LC20 and LC10) of imidacloprid. The effects were assessed on the surviving individuals emerged from sixth-instar larvae that had ingested imidacloprid-treated chickpea pods. Age-specific parameters were found to be highest with the commencement of age and gradually decreased with the progression of age in both the treated and non-treated groups. Survivorship was reduced to 37 days after exposure to the sublethal dose of LC50 when compared with 42 days in groups not exposed to the insecticide. The highest number (17%) of unhatched eggs was recorded in insects treated with the LC50 dose of imidacloprid, whereas 98% of the eggs hatched in the unexposed group. The potential fecundity of the F1 generation females was reduced to 330 eggs/female/generation when treated with the LC50 dose compared with that of the unexposed females. The intrinsic rate of increase was found to be least in insects exposed to the LC20 dose (0.0355 females/female/day) and highest (0.0470) in the unexposed group. It took 38.83 days for H. armigera to complete one generation in the unexposed population, while this was reduced to 33.94 days after exposure to the sublethal dose of LC50. The longevity of adults decreased when the larvae were exposed to the sublethal dose of imidacloprid. The developmental time of pre-pupae and pupae significantly decreased and was least when exposed to the highest sublethal dose of the insecticide. Thus, at sublethal doses, imidacloprid caused a significant reduction in the survival and fecundity as well as increased mortality of H. armigera in the subsequent generation after exposure to the insecticide. In conclusion, imidacloprid can be successfully incorporated into integrated pest management of H. armigera.

Keywords

Helicoverpa armigeranet reproductive rateimidaclopridintrinsic rate of increasepotential fecunditydoubling time
Type
Research Papers
Information
International Journal of Tropical Insect Science , Volume 33 , Issue 4 , December 2013 , pp. 264 - 275
Copyright
Copyright © icipe 2013 

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