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PENGUJIAN EFEK PENGHAMBATAN EKSTRAK DAUN WIDURI TERHADAP PERTUMBUHAN LARVA Spodoptera exigua Hubn. (Lepidoptera: Noctuidae) DENGAN MENGGUNAKAN INDEKS PERTUMBUHAN RELATIF | Shahabuddin | Agroland: Jurnal Ilmu-ilmu Pertanian

PENGUJIAN EFEK PENGHAMBATAN EKSTRAK DAUN WIDURI TERHADAP PERTUMBUHAN LARVA Spodoptera exigua Hubn. (Lepidoptera: Noctuidae) DENGAN MENGGUNAKAN INDEKS PERTUMBUHAN RELATIF

Shahabuddin Shahabuddin, Flora Pasaru

Abstract


The study was conducted to evaluate the growth inhibition effect of leaf extract of Crown plant (LEC), Calotropis gigantean, at various concentrations (5%, 4%, 3%, 2 %, 1 %, and 0% ) on S. exigua larvae.  Inhibition effect was quantified by using growth (GI) and relative growth (RGI) indexes which have some advantages compared to other insect growth parameters. The results showed that the growth inhibition effect of the leaf extract of C. gigantea could be detected using the GI and RGI. The RGI values decreased with increasing of the extract concentration and the LC50 value of LEC to S. exigua was about 2.42 %. The results suggested that C. gigantea extracts contain insect growth inhibitor substance.


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