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Effect of kind and method of fungicidal treatment of bean seed on infections by the VA-mycorrhizal fungus Glomus macrocarpum and by the pathogenic fungus Fusarium solani
Authors:J J Muchovej  Rosa M C Muchovej  E J Gonçalves
Institution:(1) Departamento de Fitopatologia, Universidade Federal de Viçosa, 36570 Viçosa, MG, Brazil;(2) Departamento de Biologia Geral, Universidade Federal de Viçosa, 36570 Viçosa, MG, Brazil
Abstract:To test the effect of seed treatment with fungicides on the development of mycorrhizal fungi, bean seeds were treated with fungicide dry or vehicled in the organic solvents, ethanol or dichloromethane and then planted in soil inoculated with the mycorrhizal fungus Glomus macrocarpum and/or the plant pathogenic fungus Fusarium solani. Measurements were made at 4 day intervals, to evaluate the location and extent of colonization of either Glomus macrocarpum or Fusarium solani in the root system. Most combinations of fungicide-solvent had little effect on the extent of colonization by each fungus individually. However, when both fungi were inoculated together, symptoms of F. solani were seen only in the tips of roots which indicate that the mycorrhizal fungus was able to limit the occurrence of the pathogenic fungus.
Keywords:benomyl  captan  dichloromethane  ethanol  fungicidal seed treatment  Fusarium solani  Glomus macrocarpum  organic solvents  Phaseolus vulgaris  spatial progression  temporal progression  VA-mycorrhizas
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