An attempt was made to explore the incidence of lemon butterfly larva in the orchards and nurseries of Jara lemon, Mandarin and Sweet orange in Jaintapur, Sylhet during May to October 2014. At host plant level, citrus orchards were selected from Citrus Research Station (CRS), Dowdic, Bagerkhal, Lamashampur and Utlarpar village of Jaintapur upazila. In case of orchard, leaf infestation of lemon butterfly larva was recorded from north-facing, south-facing, east-facing, west-facing and central canopy. The maximum leaf infestation was recorded from north-facing canopy of Sweet orange (28.33%), Mandarin (26.56%) and Jara lemon (12.89%). The minimum leaf infestation was recorded from east-facing canopy of Jara lemon (8.47%), Mandarin (20.16%) and Sweet orange (2018%). At landscape level, the highest leaf infestation was recorded in Mandarin (24.69%) and Sweet orange (27.89%) of Bagerkhal village. The lowest leaf infestation (20.16%) was recorded in Mandarin orchard of CRS. Larval infestation on Jara lemon, Mandarin and Sweet orange leaves was low in May and gradually increased up to October. The seasonal fluctuation pattern suggests that pest management measures need to be adopted during new flushes to keep the pest attack below economic injury level. In case of nurseries at CRS only, infested seedlings of Jara lemon, Mandarin and Sweet orange were sampled at 15 days after grafting (DAG), 30 DAG, 45 DAG and 60 DAG from 2.0 m × 2.0 m quadrat. At 60 DAG, the highest infestation was recorded in Jara lemon (57.5%), Mandarin (70.0%) and Sweet orange (82.5%). At 15 DAG, the lowest infestation was recorded in Jara lemon (5.0 %), Mandarin (12.5%) and Sweet orange (20.0%). Seedling infestation rapidly increased up to 30 DAG and gradually increased up to 60 DAG. The larval incidence pattern on seedlings indicates that proper management techniques need to be undertaken at 15 DAG when seedlings are at very early stage and larval attack just starts in the nursery.