Adequate pollination in crop ecosystem is an important element to achieve crop production targets being tried by employing various techniques. Dominating pollinators like honey bee is not suited to closed environment like polyhouses. Moreover, it is required to have an alternate back up pollinator for meeting the pollination needs of various crop ecosystems. For this the bumble bees are advantageous over the honey bees due to their long working hours, long tongue length, effectiveness in less numbers and their capacity to forage vigorously at low temperature and low light...