. The relation of applied science to sugar production in Hawaii. Sugar growing. 46 symptom of the disease, which is a binding of the leaf bases into a tight, unyielding' jacket about the stem. The cane shoot illus- trated on page 44, Pig. 1, is in the condition commonly recognized as a typical case of iliau. The outer leaves are dead and dry, while the leaf-sheaths are firmly cemented tog-ether into a hard, unyielding case. The stem-tip is so securely bound up by the hardened leaf-bases that it will be unable to make any further growth and must eventually die as a result:. The leaf-sheaths kil
. The relation of applied science to sugar production in Hawaii. Sugar growing. 46 symptom of the disease, which is a binding of the leaf bases into a tight, unyielding' jacket about the stem. The cane shoot illus- trated on page 44, Pig. 1, is in the condition commonly recognized as a typical case of iliau. The outer leaves are dead and dry, while the leaf-sheaths are firmly cemented tog-ether into a hard, unyielding case. The stem-tip is so securely bound up by the hardened leaf-bases that it will be unable to make any further growth and must eventually die as a result:. The leaf-sheaths killed by the fungus are always pinkish-brown in color, while the rind, if the shoot has succeeded in producing any stick, is a deep bluish-gray. These colors are quite characteristic in canes afflicted with this disease and consequently are an aid to correct diagnosis. Careful cultural studies of diseased tissues disclosed the fact that iliau was caused by a fungus previously unknown. It belongs to the genus (lUomonia, and was named Gnomonia iliau. The vegetative or feeding mechanism of this fungus consists of minute branching threads (mycelium) which grow through the cane tissues, destroying the living cells and absorbing their con- tents. The fungus produces two types of fruiting bodies, one in the form of pustules in the inner leaf-sheaths and stem ( Fig. A ), and the other in the form of tiny calabash-shaped bodies which arc imbedded in the superficial leaf-sheaths with only their tips exposed ( Fig. !>)? Enormous numbers of black spores ( Fig. Ci. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Hawaiian Sugar Planters' Association. Experiment station. Honolulu
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