Insecticidal activity of chitosans of different molecular weights and chitosan-metal complexes against cotton leafworm Spodoptera littoralis and oleander aphid Aphis nerii

Mohamed E. I. Badawy and Ahmed F. El-Aswad
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Mohamed E. I. Badawy: Department of Pesticide Chemistry and Technology, Faculty of Agriculture, Alexandria University, El-Shatby, Egypt
Ahmed F. El-Aswad: Department of Pesticide Chemistry and Technology, Faculty of Agriculture, Alexandria University, El-Shatby, Egypt

Plant Protection Science, 2012, vol. 48, issue 3, 131-141

Abstract: As an alternative to synthetic pesticides, chitosan has received much attention as a biopolymer active against some agricultural pests. The, insecticidal activity of chitosans of four molecular weights (2.27 × 105,3.60 × 105,5.97 × 105,and9.47 × 105 g/mol) was investigated against two species of arthropod pests: oleander aphid Aphis nerii and cotton leafworm Spodoptera littoralis. In addition, the most active chitosan of 2.27 × 105 g/mol was chemically modified with metals of Ag(I), Cu(II), Ni(II), and Hg(II) to give corresponding chitosan-metal complexes. Larval mortality, growth inhibition, and antifeedant activities for third instar larvae of S. littoralis were evaluated at 4 g (a.i.) chitosan/kg diet. Chitosan of 2.27 × 105 g/mol and its complexes with Ni and Hg were the most active compounds. The results against A. nerii indicated that chitosans of 3.60 × 105 and 5.97 × 105 g/mol showed high activity among the different molecular weights in leaf-dip bioassay after 24 h of treatment with 48 and 49% mortalities, respectively, at 1000 mg/l. All compounds had a systemic effect against A. nerii. Chitosans of 2.27 × 105,3.60 × 105,and5.97 × 105 g/mol showed the highest efficacy at all concentrations tested; however, chitosan-Cu was significantly the most active among the complexes.

Keywords: arthropod pests; larval mortality; biopolymer (search for similar items in EconPapers)
Date: 2012
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Persistent link: https://EconPapers.repec.org/RePEc:caa:jnlpps:v:48:y:2012:i:3:id:67-2010-pps

DOI: 10.17221/67/2010-PPS

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