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The relation of Pythium species to the growth of a sugarcane variety in Hawaii
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|Title:||The relation of Pythium species to the growth of a sugarcane variety in Hawaii|
|Authors:||Adair, Charles Norman|
|Keywords:||Sugarcane -- Diseases and pests|
Sugarcane -- Hawaii
|Abstract:||A factor inhibiting the growth of sugarcane, Saccharum officinarum L., Hawaiian variety 37-1933, was evident in the soils of some fields of Ewa Plantation Company, Ltd., Hawaii, in which this variety had been cultivated continuously for 16 years. In a series of greenhouse pot tests involving two sugarcane varieties (37-1933 and 50-7209) this soil factor was characterized as biological, variety-specific, and pythiaceous. Pythium graminicola Subramaniam was associated with the inhibited growth of the sugarcane variety 37-1933, and was pathogenic toward this variety when evaluated according to Koch's Postulates. P. acanthicum Drechsler was associated with the field soils in which the growth of sugarcane variety 37-1933 was depressed, but not as a sugarcane root pathogen. P. acanthicum was very weakly pathogenic toward sugarcane when evaluated according to Koch's Postulates, but was strongly mycoparasitic in culture, attacking many soil fungi. P. graminicola inhibited growth of the sugarcane variety 37-1933 when inoculated in fumigated or non-fumigated soil. Specificity of P. graminicola isolates toward the sugarcane variety from which they were isolated (37-1933 or 50-7209) was not significant in pathogenicity tests except when P. acanthicum was introduced into the fumigated soil with P. graminicola. The levels of soil fungi and actinomycetes antagonistic toward P. graminicola and P. acanthicum in high-carbohydrate media were much lower in the Ewa soil than in soils from another plantation (Waialua Agricultural Company, Ltd.) in which the variety 37-1933 had never been grown. Nearly all of the antagonistic fungi noted in these studies, including species of Trichoderma, Penicillium, and Aspergillus, were parasitized by P. acanthicum in low-carbohydrate media.|
Bibliography: leaves -118.
vi, 118 l illus
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|Appears in Collections:||Ph.D. - Botany|
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