POPULATION DYNAMICS OF THE FENUGREEK APHID, ACYRTHOSIPHON PISUM (HARRIS)
Department of Entomology, College of Agriculture (SK Rajasthan Agricultural University), Bikaner-334006 Department of Entomology, Rajasthan College of Agriculture, MPUAT, Udaipur-313001
C. NAGA , V.S. ACHARYA , K. L. NAGA , A. K. MEENA AND A. K. SINGH
A field experiment was carried out to study the population dynamics of fenugreek aphid on variety RMt-1 during rabi , 2011-12. The incidence of the pest began from the 2nd standard meteorological week (SMW) in January and continued up to 13 SMW in March with a peak activity (105.10 aphids/10cm top shoot) during 7 SMW in February,2012. The two aphid predators, C. septempunctata and Chrysoperla sp. were observed feeding on the aphid. The population of both the predators was the minimum in the 3 SMW and maximum in the 7 SMW, being 4.50 and 2.90 per 10cm top shoot/plant, respectively. The coefficient of correlation (r) between the aphid and both the predators (septempunctata and Chrysoperla sp.) revealed significant positive correlation 0.957 and 0.941, respectively.