Insecticidal activity of five ethanolic extracts against common cutworm, Spodoptera litura (Fabricius) (Lepidoptera: Noctuidae)
2018
Javier, A.M.V. | Ocampo, V.R. | Caballo, F.A. | Javier, P.A.
Ethanolic extracts from five Philippine plants, namely: Alpinia pyramidata Blume, Lantana camara L., Plectranthus amboinicus (Lour.) Spreng. (=Coleus amboinicus Lour.), Curcuma longa L. andCatharanthus roseus (L.) G. Don were evaluated in the laboratory for their insecticidal activities against third larval instar of common cutworm, Spofoptera litura (Fabricus) (Lepidoptera: Noctuidae). All the five ethnolic extracts were toxic against cutworm (LD sub 50 = 48.44-80.19 mug/mL acetone) when applied topically at 72th after treatment, while L. camara extract was the most toxic (LC sub 50 =126.01 mug/g larval body weight) when applied trough leaf residue film method. Ethanolic extract from P. ambolinicus provided the highest antifeedant activity at 250 mug/g. At 1000 mug/g, all ethanolic extracts showed repellency comportable with Cybopogan nardus. Ethanolic extracts from A. pyramidata and Cu. Longa showed remarkable insect growth regulatory activities against cutworm expressed by a high number of abnormal pupae, and adults, respectively. Meanwhile, ethanolic extracts from L. camara, P. amboinicus, Ca. roseus and A. pyramidata provided short life span of 7-8 days when applied on the cutworm larvae ; a normal adult lived for about nine days when provided with 100% honey solution as food. In view of their overall pesticidal properties, crude ethanolic extracts from the five plants could be studied further and develop formulation for control of cutworm.
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