Pollination of pear by bumblebees (Bombus terrestris L.) and honeybees (Apis mellifera L.)

Since the beginning of the nineties the importance of bumblebees as pollinators is well established. Several commercial firms are rearing colonies. Up to now bumblebees are mainly used for pollination in glasshouses and plastic tunnels, especially to pollinate tomatoes. Since blooming of pear is relatively early in the season and frequently occurs at adverse weather conditions, insect pollination may be inadequate. In 1992 research has was to find out whether placing bumblebee colonies in a pear orchard could increase the frequency of flower visits by bumblebees and could improve fruitset. Flower visits by Bombus terrestris workers were rare and contributed relatively little to the flower visits of pear by insects. Flower visits in the orchard mainly came to the account of honeybees. Especially pollen of pear is attractive for honeybees. In addition to honeybees other pollinating insects are important for flower visits on pear blossom.