none Sesamia grisescens Walker (Lep: Noctuidae) is a serious pest of sugar-cane at Gusap, Papua New Guinea. Annual sugar production losses range from 5 to 18%, valued at up to US 8.4 times 10-6. Basic biological studies and various control techniques studied in the last 6-7 years are reviewed. S. grisescens populations are highly synchronized with 51/2 generations a year. Populations tend to peak in May-June and subsequently decline as a result of dry weather. The control of S. grisescens requires integration of several cultural and biological inputs, owing to a sugar-cane varietal interaction, the time of planting and the harvesting of heavily infested fields. Inundative releases of Cotesia flavipes Cam. (Hym.: Braconidae) gave up to 70% parasitism and the imported eulophid Pediobius furvus Gahan slowly became established in the field. The use of systemic insecticides such as carbofuran over several seasons was ineffective in controlling S. grisescens. Pheromones are still being evaluated for population monitoring and may possibly be useful for mating disruption.