PENGARUH EKSTRAK ALANG-ALANG (Imperata cylindrica(L.) Beauv) TERHADAP LARVA ULAT GRAYAK (Spodoptera litura Fabricius) (The effect of alang-alang extract (Imperata cylindrica (L.) Beauv) on armyworm (Spodoptera litura Fabricius))

Jamsari, Jamsari and Yunisman, Yunisman and Ardi, Ardi (2010) PENGARUH EKSTRAK ALANG-ALANG (Imperata cylindrica(L.) Beauv) TERHADAP LARVA ULAT GRAYAK (Spodoptera litura Fabricius) (The effect of alang-alang extract (Imperata cylindrica (L.) Beauv) on armyworm (Spodoptera litura Fabricius)). Stigma, VIII (4). ISSN 0853-3776

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Abstract

An experiment the study the effect of alang-alang extract on armyworms was conducted at the laboratory of Faculty of Science and Mathematics, laboratory of Department of Agronomy, and laboratory of Department of Plant Pest and Disease Faculty of Agriculture Andalas University Padang during the period of july to December 1997. The objective of the experiment was to investigate the efficacy of alang-alang extract to kill the larvae of armyworms. Treatments were arrenged factorially in Complete Randomized Design with two factors and three replications. The lirst factor was alang-alang extract concentration i.e. O.O%; 0.1%; O.5%; and 1.0%. The second factor was the stadia of larvae i.e. instar I, instar III, and instar V. Each treatment consists of ten larvae. The mortality of larvae was observe d S x ?.4 hours later. Result indicated that the mortality rate increased significantly as alang-alang extract concentration increased from O.1% up to 1.0%,Instar V was more susceptible than instar III and instar I.

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