Mr. Mangali has optimized the size, material, weight and arrangement of silk worm rearing trays thus achieving increased cocoon capacity along with a host of benefits. These modified trays are rectangular unlike conventional round trays and can be stacked on racks. He has made these 3 feet by 4 feet trays using wooden strips and plastic wires. Hence they are light weight and of low cost. A single person can handle them comfortably and they can be hoisted up to a height of 5-6 feet. More trays can be accommodated on the racks as with the use of these trays the space between two trays on the stands can be reduced to 10" - 12". Thus by using these trays one can double the capacity of silkworm rearing room. These trays are also easier to sterilize and disinfect by dipping in bleaching powder solution or any other disinfectant. With these trays it is more convenient to feed the silkworms, harvest mature cocoons and clean dead and decomposing worms or cocoons. This will also help to prevent the spread of infection if there is any.