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Commercially bulbs of Hippeastrum hybridum are propagated by twin scales, which are cultured in wet vermiculite in the darkness until bulbil appearance. We showed that twin scales kept under sun light produced bulbils, that once transferred to the field, did not undergo severe light stress. They had higher bulb dry weight and due to the presence of green leaves they grew faster when transplanted to the field than bulbils produced from scales kept in the darkness. An intermediary treatment (a period of darkness followed by transference to light) confirmed the advantages of producing bulbils under sun light conditions. It appears that in the field, growth of bulbs from dark grown bulbils was retarded due to the strong competition among leaves and roots for nutrients and assimilates. Comercialmente, bulbos de Hippeastrum hybridum são propagados por escamas duplas, as quais são mantidas em vermiculita umedecida e no escuro até o aparecimento do bulbilho. No presente trabalho demonstrou-se que escamas duplas mantidas sob luz solar plena produziram bulbilhos que uma vez transferidos para condições de campo não sofreram o estresse imposto pela luz. Tais bulbilhos possuíam maior peso seco de bulbo e, devido a presença de folhas verdes, cresceram mais rápido do que bulbilhos produzidos no escuro. Um tratamento intermediário, em que as escamas foram mantidas na escuridão por um período e depois transferidas para a luz, confirmou as vantagens em se produzir bulbilhos na luz. Muito provavelmente, bulbilhos produzidos no escuro tiveram seu desenvolvimento atrasado devido a forte competição entre folhas e raízes por nutrientes e fotoassimilados

Effects of light on the propagation and growth of bulbs of Hippeastrum hybridum cv. Apple Blossom (Amaryllidaceae)