2015-03-122015-03-12https://dl.nsf.gov.lk/handle/1/17756Biological sciencesBiological ControlInvestigation of the biology and life history of Tetrastichus Hagnenowii (Ratz) the egg parasite of the american cockroach Periplaneta Americana (L)ThesisUniversity of Sri JayewardenepuraRG/77/013FR 0566 T