Population dynamics of leaf miner, Phyllocnistis citrella (Stainton) infesting sweet orange

Abstract

Investigations on population dynamics of leaf miner, Phyllocnistis citrella infesting sweet orange were carried out under field condition during 2016-17 at Horticultural Research Station, Junagadh Agricultural University, Junagadh. The infestation of P. citrella (14.90%) started from 1st week of December, 2016 (48th SMW) and showed first peak (19.80%) during 5th week of December (52nd SMW). The infestation again increased and reached to its second peak (22.50%) during 3rd week of September (37th SMW). There was negative highly significant impact on the incidence of leaf miner due to MaxT [-0.501**] and wind speed [-0.559**] but there was no any significant linear correlation either negative or positive between incidences of leaf miner population for rest of the physical factors. However, MinT [-0.202] were negatively and relative humidity (RH1 [0.173], RH2 [0.195]) were positively whereas bright sun shine hours (BSS) [-0.100] were negatively correlated with the incidence of leaf miner population but the relationship was non-significant.