Efficacy of safer insecticides against aphid on celery

摘要

Aphids (Myzuspersicae) are one of the most important pest of celery, which is cultivated for its fleshy leafstalks, seeds and essential oil. Aphids suck sap from the plant and reduce yield. Also, they transmit viral diseases and contaminate celery produce with honeydew. Some safer insecticides namely flonicamid 50 WG @ 150, 175 and 200 g/ha, imidacloprid 200 SL @ 75, 100 and 125 ml/ha, thiamethoxam 25 WG @ 75, 100 and 125 g/ha and acetamiprid 20 SP @ 37.5, 50 and 62.5 g/ha were evaluated for their efficacy against aphids. Population of aphids per inflorescence before spray varied from 12.03 to 13.20. All the treatments were significantly better than control. On all observation dates flonicamid @ 175 and 175 and 200 g/ha, imidacloprid @ 100 and 125 ml/ha, thiamethoxam @ 100 and 125 g/ha, acetamiprid @ 50 and 62.5 g/ ha were statistically better in reducing aphid population than other treatments. Highest seed yield of 11.30 q/ha was obtained with flonicamid50 WG @ 200 g/ha which was statistically atpar with imidacloprid 200 SL @ 100 and 125 ml/ha, thiamethoxam 25 WG @ 100 and 125 g/ha and acetamiprid 20 SP @ 50 and 62.5 g/ha and flonicamid50 WG @ 175 g/ha.