Antifeedant activity of different Polygonum species against Helicoverpa armigera (Hub.)

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Laboratory studies were carried out to evaluate the antifeedant activity of different species of Polygonum i.e. P. barbatum (stem), P. limbatum (leaves & stem) P. plebejum (whole plant) against third instar larvae of H. armigera. The methanolic extracts of P. barbatum (stem) showed extremely significant antifeedant activity having C- value of 0.0266, 0.044 and 0.05 at 10,000, 7,000 & 5,000 ppm concentration respectively. At highest concentration the extract of P. limbatum (leaves) showed the significant antifeedant activity with C-values 0.434. Extremely antifeedant activity in P. limbatum (stem) and P. plebejum (whole plant) was observed at 10,000 ppm with C-values 0.192 & 0.297 respectively. Since the stem extract of P. barbatum showed significant antifeedant activity at lower concentration, thus, it can be used as better alternative to synthetic pesticides. Laboratory studies were carried out to evaluate the antifeedant activity of different species of Polygonum i.e. P. barbatum (stem), P. limbatum (leaves & stem) P. plebejum (whole plant) against third instar larvae of H. armigera. The methanolic extracts of P. barbatum (stem) showed extremely significant antifeedant activity having C- value of 0.0266, 0.044 and 0.05 at 10,000, 7,000 & 5,000 ppm concentration respectively. At highest concentration the extract of P. limbatum (leaves) showed the significant antifeedant activity with C-values 0.434. Extremely antifeedant activity in P. limbatum (stem) and P. plebejum (whole plant) was observed at 10,000 ppm with C-values 0.192 & 0.297 respectively. Since the stem extract of P. barbatum showed significant antifeedant activity at lower concentration, thus, it can be used as better alternative to synthetic pesticides.

Polygonum species; Helicoverpa armigera; Antifeedant