Honey bees and bumble bees serve as a vector for the dispersal of biocontrol agents for the control of diseases of flowering and fruit crops (Sandhu and Waraich, 1985, Kevan et al., 2003). An innovative method of application of bio-control agent right in the infection court at the exact time of susceptibility was developed by Thomson et al. (1992). A dispenser is attached to the hive and loaded with powder formulation of the PGPR or with other desired biocontrol agent. The foragers when exit the hive, the antagonist get dusted on to bee and delivered to the desired crop, while attempting for sucking the nectar. Erwinia amylovora causing fire blight of apple infects through flower and develops extensively on stigma. Colonisation by antagonist at the critical juncture is necessary to prevent flower infection. Since flowers do not open simultaneously the bio-control agent P. fluorescens has to be applied to flowers repeatedly to protect the stigma. Nectar seeking insects like Aphis mellifera can be used to deliver
P. fluorescens to stigma. Bees deposit the bacteria on the flowers soon after opening due to their foraging habits. Honey bees have also been used for the management of gray mold of strawberry and raspberry (Peng et al., 1992; Sutton, 1995; Kovach et al., 2000).