Antifeedant and growth regulatory effects of Subhash Palekar’s natural formulations on tobacco caterpillar, Spodoptera litura (fabricius) and bihar hairy caterpillar, Spilarctia obliqua (walker)
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Date
2022-07
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G.B. Pant University of Agriculture and Technology, Pantnagar, District Udham Singh Nagar, Uttarakhand. PIN - 263145
Abstract
A premilarily and novel study was made to evaluate the antifeedant and growth regulatory effects of Subhash Palekar’s Natural Formulations (SPNFs) on Tobacco Caterpillar, Spodoptera litura and Bihar hairy caterpillar, Spilarctia obliqua under laboratory conditions in Department of Entomology, College of Agriculture, G.B Pant University of Agriculture and Technology, Pantnagar,Uttarakhnad, during 2021-22.The bioassay technique based on leaf dip method was followed to find out the growth regulatory effects and antifeedant activity of SPNFs @3% and desi cow urine at @10% against different larval stages of S.litura and S.obliqua based on growth parameters on treated castor leaves. The growth and development studies clearly showed the efficacy of Jeevamrit, Ghanjeevamrit, Beejamrit, Neemastra, Agniastra, Dashparni and Desi cow urine against neonate, 7days old and 4th instar larvae of S. litura and S. obliqua as larval mortality was observed significantly more in treated castor leaves. The neonate larvae of both tested insects were found more sensitive to agniastra, dashparni as almost all tested larvae died on treated castor leaves. On the other hand, the least growth index values were calculated in castor leaves treated with Jeevamrit and Ghanjeevamrit (0.33 and 0.30 ) for 0-24h and 7days and Jeevamrit and Ghanjeevamrit (0.19 and 0.22) for 0-24h and 7days old larvae of S. litura and S. obliqua, respectively. On the other hand, among the other treatments of natural formulations the survival of larvae, pupae and adults along with their weights were recorded significantly less with extended larval and pupal developmental period and very less growth index values in comparison to untreated control. The studies conducted on antifeedant activity of natural formulations showed that Neemastra, Agniastra and Dashparni were found with strong antifeedant action with preference index between (0.46-0.79) against 4th instar larvae of S. litura whereas Ghanjeevamrit, Agniastra ,Neemastra and Dashparni showed strong antifeedant activity with preference indices (0.35 to 0.81) against 4th instar larvae of S. obliqua. Among the other treatments, Jeevamrit and Desi cow urine showed moderate antifeedant activity with slight antifeedant activity observed in Beejamrit. Thus, this preliminary and novel study clearly demonstrated the strong to moderate antifeedant activity of Subhash Palekars natural formulations along with growth inhibitory effects on different larval stages which opens a new avenue for natural formulations as viable options for ecofriendly management of the noxious pests S.litura and S.obliqua in field crops.