Browsing by Author "Raakhee Mohan"

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    Bio- ecology and management of stingless bees
    (Department of Agricultural Entomology, College of Agriculture, Vellayani, 2000) Raakhee Mohan; Devanesan, S
    With the objective of studying the bio-ecology and management of stingless bees, a study was conducted at the College of Agriculture, Vellayani during 1997-99. The bee samples collected from all districts of Kerala were identified to be of the same species viz., Trigona iridipennis Smith. The colony consisted of a queen, workers and few drones during the colony breeding season. The building material used by T. iridipennis was cerumen. The species arranged their brood in clusters. Queen cells were larger than worker brood cells. Food chamber of the species lay outside the brood nest. The food chamber consisted of honey and pollen pots which were larger than brood cells. Feral colonies which were transferred to different types of hives ('~II ablished and this showed that the bees could be hived in artificial domiciles which was a satisfactory step towards domestication. Different management practices were tried. Division of the bee colony could be successfully carried out by transferring half the amount of brood cells, pollen and honey pots along a queen cell to the daughter colony. Wooden hives were found to be more suitable for hiving T. iridipennis since the brood development and honey yield were superior in this type of hive. The studies on the method of extraction of honey indicated the feasibility of collecting honey by keeping the storage pots in trays under sunlight. Observations on the behaviour of T. iridipennis showed that each brood cell was constructed by the summation of activities of several workers. Mass provisioning of the brood cells was noticed. The brood cells were seen used only once. Queen laid egg in the provisioned cell and after the oviposition a worker closed the cell. The bees used their mandibles as a means of defence. The average egg, larval and pupal period of T. iridipennis was found to be 4.7, 18.6 and 21.8 days respectively with a total developmental period of 45.1 days. The species had reduced wing venation. The mandibles were modified. The hind leg of the worker bees had the 'pencillium'. The stingless bee queens were larger than workers Investigations on the foraging behaviour showed two peak periods of activity one at 1200 h and the other at 1500 h. Twenty seven plants were recorded as bee flora. Of the 27 plants recorded, twelve plants (rubber, cashew, coconut, chilly, cannon ball tree, coral creeper, drumstick, guava, rose, birds cherry and tamarind) provided both nectar and pollen. Eight plants (anthurium, bajra, sponge gourd, cinnamon, ixora, mango, touch-me-not and sunflower) noted, were sources of pollen while seven plants (balsam, banana, duranta, euphorbia, hamelia, marigold and phyllanthus) provided nectar only. Two species of spiders (unidentified) and ants (Solenopsis geminata) were found as enemies of T. iridipennis. Stingless bee honey was slightly acidic to taste and had a dark brown colour with the acidity and pH values being 0.294 and 3.98 respectively. The specific gravity was l.394 g/cc. It had a moisture content of 20.7 per cent. Glucose and fructose were 37.1 per cent and 4l.6 per cent respectively. The honey had a higher protein content of 1.49 per cent and ash content of 1.1 per cent.