Onion (Allium cepa L.) is subjected to the attacks of certain insect pests during storage period, which extends from early June until early November; including those belonging to the genus Eumerus particularly the onion bulb fly Eumerus amoenus Loew. (Diptera: Syrphidae) .This investigation aimed at evaluating the efficacy of six different storage methods; three outdoor (bulbs on the soil, bulbs on the soil covered with hay and bulbs in perforated plastic sacks) and three indoor (bulbs on the floor, bulbs on shelves and bulbs in perforated plastic sacks) on onion bulbs infestation with E. amoenus throughout the three successive storage seasons of 2003-2005 at Assuit Governorate using the variety "Giza 6 Mohassan" .The effect of frequent discarding of bulbs infested with E. amoenus on the % infested bulbs and yield loss was also investigated.Storing bulbs indoor decreased infestation than their storage outdoor. Onion bulbs stored outdoor on the soil received the highest infestation (23.0-36.5 %) while storing them in sacks either outdoor or indoor recorded the least infestation (10.0-19.0% and 11.0-14.5%, respectively). Discarding infested bulbs decreased infestation percentage by about 6-14%.The relationship between % bulb infestation and yield loss was highly significant (r = 0.994-0.999and b = 0.63-0.77). A change of 10 % in the % infested bulbs alters yield loss by approximately 6 -8 %.
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