Articles
INVESTIGATIONS INTO THE CAUSES OF BRACT BROWNING IN WARATAHS (TELOPEA SPP.)
Article number
602_13
Pages
99 – 102
Language
English
Abstract
Bract browning of waratahs reduces their market value and export potential as a cut flower crop.
Many environmental factors such as light, water stress and localised calcium deficiency have been implicated in the development of bract browning.
Potted waratahs of cultivars Olympic Flame and Sunflare grown under 50% shade cloth had significantly lower bract browning scores than those grown in full sun.
Frequent irrigation was less important, but responses differed between cultivars.
Although calcium sprays to the affected area have been found to reduce necrosis attributed to localised calcium deficiency in other species, definitive results for calcium sprays have not yet been obtained for waratahs.
Experiments in the 2001 growing season indicate that shade cloth and other means of protection have the potential to significantly reduce bract browning.
Many environmental factors such as light, water stress and localised calcium deficiency have been implicated in the development of bract browning.
Potted waratahs of cultivars Olympic Flame and Sunflare grown under 50% shade cloth had significantly lower bract browning scores than those grown in full sun.
Frequent irrigation was less important, but responses differed between cultivars.
Although calcium sprays to the affected area have been found to reduce necrosis attributed to localised calcium deficiency in other species, definitive results for calcium sprays have not yet been obtained for waratahs.
Experiments in the 2001 growing season indicate that shade cloth and other means of protection have the potential to significantly reduce bract browning.
Publication
Authors
A. Martyn, C. Thomas, B. Gollnow, C. Offord, R. McConchie
Keywords
bract burn, calcium sprays, irrigation frequency, light, nutrition, protection, shade cloth, water stress.
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