Vol. 3, Issue 1 (2018)
Screening of some plant extracts against polyphagous pest Spodoptera litura (Lepidoptera: Noctuidae)
Author(s): Ankita Awasthi, Sangeeta Avasthi
Abstract: Spodoptera litura is an economically important polyphagous pest. It feed on a wide range of horticultural crops and caused severe damage to the fruit. Several chemical pesticides are used to control its infestation but these chemicals produce many adverse effects on environment, animals and non-target pest. So, there is a need of ecologically safe crop protectants. Botanical pesticides are an important group of naturally occurring and slow-acting crop protectants. They are generally safe to the animals and environment than the conventional pesticides with minimum residual effect. These contains mixture of biologically active substances thus no resistance developed in the pest. In the present study, Lantana camara (leaves), Pedalium murex (root), Taxodum disticum (leaves), Ageratum vulgaris (Whole plant), Gymnema sylestre (Leaves) were tested against tobacco caterpillar. The maximum antifeedant activity was observed in Pedalium murex (87.49%) followed by Lantana camara (83.17%), Gymnema sylestre (63.08%), Taxodum disticum (56.24%) and Ageratum vulgaris (51.27%). Highest larval mortality (72%), lowest pupation (28.61%), lowest adult emergence (11) were also observed during Pedalium murex treatment. Percentage of deformed pupae was highest in Lanatana camara treatment (23.01%). Adult moth showed poorly developed wings and reduction of body size in this treatment. Taxodum disticum, Ageraturm vulgaris and Gymnema sylestre were also showed significant morphogenetic effect against Spodoptera litura.