ISTIGAR PRANA Efektifitas Insektisida Nabati Umbi Gadung (Dioscorea Hispida Dennst) Dan Serai Wangi (Cymbopogon Nardus L) Terhadap Mortalitas Ulat Grayak (Spodoptera Litura F). S1 thesis, Universitas Trunojoyo Madura.
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