Abstract
The alterations brought about in the carbohydrate spectrum of root exudates of wheat in response to six foliar treatments, and their influence on the fungal population of the rhizosphere have been correlated. Pronounced suppression of ribose, maltose and raffinose exudation, which were liberated abundantly from root-rot infected roots, was recorded in response to foliar treatments with chloramphenicol and KCl. Chloramphenicol and to a lesser extent 2,4-D also reduced the rhizosphere population, including the test pathogen Helminthosporium saticiun. Previous and present investigations, therefore, indicate that the composition of root exudates could effectively be altered by foliar sprays, in an attempt to control the activity of Helminthosporium sativum, causing root-rot of wheat, in soil.
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