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?opulations of S. farctfbra and N. tu,gens wcrc studied t'or 3 seasons ot' rice cultivation at Kalugoniuwa, Kandy District, Sri I.anka. In 2 of the 3 seasons, S, .furcijbra was supcrior in abundancc te N, lugens. Both species werc similar in seasonal trend of adult population te eaeh other, but the proportions of brachypterous fbrrns to the whole adults fiuctuated in difi'erent ways betwcen the 2 spccies. N, tugens was less aggregatis,e in spaLial d{stribution than S. farcijbra. Parasitic activities oi' Elenchidae, Dryinidae, Pipunculidae and Nematoda were sometimcs considcrably high, but they were ncither persistcnt nor regulative against the hostpopulat'Ion,

Studies on Populations of Sogatella furcifera HORVATH and Nilaparvata lugens ST&Aring;L (Hemiptera : Delphacidae)and their Parasites in Sri Lanka

Studies on Populations of Sogatella furcifera HORVATH and Nilaparvata lugens STÅL (Hemiptera : Delphacidae)and their Parasites in Sri Lanka