author(s)
B Poovizhiraja, C Chinniah, M Murugan, S Irulandi, K Eraivan Arutkani Aiyanathan and TN Balamohan

abstract
A field experiment was conducted to investigate the seasonal abundance of major sucking pests viz., citrus blackfly, Aleurocanthus woglumi Ashby and citrus psyllids, Diaphorina citri Kuwayama on acid lime during September 2017 to August 2018. The influence of weather factors on population fluctuation of sucking pests in acid lime ecosystem was recorded that the occurrence of A. woglumi and D. citri were noticed throughout the study period 35^th (1^st week of September) to 34^th (4^th week of August) standard weeks. The population of D. citri attained first peak during 40^th standard week (1^st week of October) with 17.20 nymphs/ twig and its second peak during 19^th standard week (2^nd week of May) recording 17.40 nymphs/twig. The maximum population of D. citri could be observed during 34^th standard week (4^th week of August) with 24.50 nymphs /twig. Then the population of A. woglumi gradually increased and reached its first peak during 25^th standard week (4^th week of June) recording 67.70 nymphs/leaf. The sharp decline in A. woglumi population was noticed from 36^th standard week (2^nd week of September) and again started declining from 26^th standard week (5^th week of June) to 34^th standard week (4^th week of August). The correlation studies on the weather parameters with D. citri and A. woglumi population revealed that the maximum and minimum temperatures, relative humidity showed significant positive relationship with D. citri, where as rainfall exhibited non significant relationship with D. citri and A. woglumi. From the multiple linear regression analysis it is evident that among the weather factors, maximum and minimum temperatures, relative humidity had significant positive correlation with D. citri and A. woglumi, while rainfall exhibited non significant association with D. citri in acid lime ecosystem.