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The studies conducted at the College of Horticulture, UHS Bagalkot on amaranthus resulted in exploring 42 phytophagous species, 12 natural enemies and four pollinators from the ecosystem. Out of the phytophagous species, Spoladea (=Hymenia) recurvalis (Fabricius), Erectomocera impectella (Walker), Psara bassalis Walker, Helicoverpa armigera (Hubner), Spodoptera litura (Fabricius), Agrotis segetum (Denis and Schiffermuller) and Agrotis sp. and Spilarctia obliqua (Walker) were predominant defoliators. Lady bird beetles were the major predators while bees were the predominant pollinators when the crop was grown for seed purpose. The crop loss estimation due to Agrotis segetum (Denis and Schiffermuller) and Spoladea (=Hymenia) recurvalis (Fabricius) on Amaranthus, foliage damage and yield loss were assessed by comparing the different treatments like insecticide treated plot, net covered and untreated (open plot) plot. The least foliage damage (9.50 ± 7.40%) and higher leaf yields (23.78 ± 1.63 t/ha) were recorded in insecticide treated plot followed by net protected plot (with 12.50 ± 10.17% leaf damage, 21.82 ± 1.02 t/ha yield), and maximum foliage damage (34.25 ± 13.15%) and least yield (13.78 ± 2.12) were noticed in untreated plot).

Key words: Amaranthus, Agrotis segetum, Spodolea recurvalis, Leaf damage and Foliage damage.