Comparative Insecticidal Activity of a Commercial and a Nanoformulation of Pyridalyl against Bollworm, Helicoverpa armigera (Hübner)
2013
Saini, Priya | Gopal, Madhuban | Kumar, Rajesh | Srivastava, Chitra | Gogoi, Robin
Pyridalyl gives good control of various lepidopterous and thysanopterous pests of cotton and vegetables, without causing phytotoxicity. In the present study, bioactivity of a commercial and a nanoformulation of this molecule is reported as contact and stomach poison against Helicoverpa armigera (Hübner). Topical application method was used to evaluate activity as a contact poison, while leaf dip method was used for evaluation of stomach and contact activity. The activity was compared on the basis of their LC₅₀ values. By topical application, LC₅₀ of nano and commercial products of pyridalyl was 90 and 210 μg ml⁻¹ respectively while by leaf dip method it was 40 and 250 μg ml⁻¹. Superior bioefficacy of nanoformulation (0.8%) was further confirmed in a pot experiment on okra.
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