An elastic device (11,13) to improve the plants fruit growth of the musaceae family with the following chemical composition: natural rubber, synthetic polyisoprene, silicon dioxide, polyethylene glycol, stearic acid, paraffin wax, sulfur, paraffinic oil, Vaseline, cyclohexylbenzothyazil sulfonamide, tetramethyl thiuram monosulfide, zinc diethyl dithiocarbamate.