The importance of assessing the population structure and biology of psylla species for pest monitoring and management in pear orchards

The species of pear sucker, also called psylla or psyllid, which are destructive insects belonging to the genus Cacopsylla (Hemiptera: Psyllidae) cause substantial damage tree plantations. Two consecutive years research were conducted on population structure and biological cycle in a small, elderly, unmaintained orchard northern Romania. Of two identified (C. pyri L. C. pyricola Forster), dominated with percentage 77.8-80.1%. Adults both emerge from hibernation first part March produce three generations per year. First-generation adults decade June, second generation last July, third September as they enter phase. Larvae appear half April, at end June - beginning August. There have been reports up 11 27 larvae leaf, 9 petiole, 14 fruit. number captured yellow sticky traps exposed southern side crown was significantly higher compared side. Following intense attack, well-known cv. ‘Williams’ heavily affected, trees badly defoliated, blackened, aged prematurely. climatic conditions did not influence phenology pests, but importance monitoring psyllids is widely argued, considering that it remains key integrated protection programs orchards.