The experiments were carried out at Indira Gandhi Agriculture University, Raipur, India to study the seasonal incidence of key insect pests of linseed, their natural enemies and determination of ETL of Dasyneura lini. Insect pest complex of linseed was observed on variety 'Neelum'. During the course of study, seven insect species, viz., linseed budfly (Dasyneura lini B.), thrips (Caliothrips indicus B.), jassids (Empoasca kerri / spp.), linseed caterpillar, semilooper, gram pod borer and green stink bug were noticed causing damage at various growth stages of linseed crop. Among these, linseed budfly and thrips were of major importance. Among the predators two species of coccinellid beetles (Menochilus sexmaculata and Coccinella septumpunctata) and a predatory spider (Lynx sp.) were mainly observed preying on them. There was a highly significant positive correletion between the budfly damage and maximum temperature and highly significant negative correlation with morning relative humidity while as thrips population was non-significantly correlated with all the weather parameters individually. To estimate the ETL of budfly, there were seven treatments (6 to zero spray). Lowest budfly damage (9.13%) was noticed when the crop was kept under complete protection against budfly while 32.52 per cent was recorded on the untreated control. Actual EIL & ETL was worked out as 10.69 and 8.02 per cent bud damage, respectively.