Uji Konsentrasi Ekstrak Murni Rimpang Jahe Merah (Zingiber officianale Rubrum) terhadap Tingkat Mortalitas Ulat Grayak (Spodoptera litura F.) pada Tanaman Kedelai (Glicyne max (L.) Merril)

Abstract

Soybean Plant (Glicyne max (L.) Merril) is a crop producer of vegetable protein derived from Families Leguminoseae. An important pest of soybean is armyworm (Spodoptera lituraF.) that attack on the vegetative phase by eating the young leaves.At this time the effort is still done by farmers to control S. litura generally still use synthetic insecticides, need for an alternative control techniques against S. litura which utilizes red ginger rhizome as an bio-insecticide. This study aims to get a concentration of pure extracts a red ginger rhizome that able to control pests of armyworm on soybean plant.Research conducted an experiment using a completely randomized design (CRD) with 5 treatment concentration of pure extracts of red ginger rhizome with 5 replications that concentration of pure extracts a red ginger rhizome 0,00, 0,25, 0,50, 0,75 and 1,00%. The 0,75% concentration of pure extracts a red ginger rhizomeable to kill S. litura 80.00% with a time of 9.60 hours early death dan LT₅₀ 33,00 hours.