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Epidemiological studies on leaf blight of wheat caused by helminthosporium spp


, : Epidemiological studies on leaf blight of wheat caused by helminthosporium spp. Indian Journal of Mycology & Plant Pathology 11(1): 21-29

The epidemiology of H. sativum Pamm., King and Bakke, H. tritici-repentis Died., H. tetramera McKinney and H. rostratum Drechs., isolated from different types of leaf spots of wheat was studied. Plants from the 3-leaf stage to maturity were susceptible to infection by all the pathogens in varying degrees. However, susceptibility progressively increased with the advance in age and reached the maximum after the flowering stage. The number of lesions and disease development increased with inoculum concentration up to a certain extent beyond which concentration had no direct effect. Studies on the influence of environmental factors (atmospheric temperature and relative humidity) revealed that the infection produced by the different species of Helminthos porium occurred at temperatures ranging 23-30.degree. C, the optimum around 28.degree. C. Atmospheric relative humidity played a significant role in disease development at a favorable temperature.

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