Observations on the female sex pheromone gland, pheromone-oriented behaviour and demographic performances of potato tubermoth, phthorimaea operculella (Zeller) (Lepidoptera : Gelechiidae) [MS Thesis] Plant Diseases OBS 571.92 Thesis (MS)--Dept. of Zoology, University of Dhaka, Session : 1993-94. Includes bibliographical references. Dhaka : University of Dhaka ; 1997. 1997. 1997 Text xiv, 126p. : eng