Kepekaan Beberapa Populasi Plutella Xylostella Di Jawa Tengah Dan Yogyakarta Terhadap Bacillus Thuringiensis = The Susceptibility of Plutella xylostella Field Populations Collected from Central Java and Yogyakarta to Bac - Perpustakaan UGM, i-lib ([Yogyakarta] : Universitas Gadjah Mada, 2002)