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Inoculum survival of Exserohilum turcicum on corn between and during growing periods

Inoculum survival of Exserohilum turcicum on corn between and during growing periods

Canadian Journal of Plant Pathology 17(2): 144-146

In fungi, inoculum survival between growing periods is dependent upon independent resting structures, infected plant debris, or upon infection of alternative hosts or propagules of the primary host. Often the ability of the pathogen to form survival structures is dependent on environmental conditions at the end of the growing season. Inoculum survival during the growing season is dependent mainly on environmental conditions between spore formation and infection. Disease spread and severity are closely associated with inoculum survival. Exserohilum turcicum, the causal agent of northern leaf blight of corn (NLB), overwinters as mycelia, conidia, and chlamydospores in infected plant parts. However, the role of overwintering mycelium in the initiation of NLB epidemics is unclear. In Israel E. turcicum overwinters on Sorghum halepense as well as on corn debris. Chlamydospore formation in infected leaves is affected by photoperiod, temperature, and host cultivar. The spread and severity of NLB are dependent on conidial viability. Conidia that form on the upper leaves of the plant are dispersed better but are less viable than conidia produced on lower leaves due to exposure to sunlight. Exposure reduces the rate of conidial respiration and significantly decreases the ability of conidia to cause new infections. This might explain the relatively steep disease gradients of NLB in the field which are indicative of limited spatial spread of conidia.

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Accession: 002641278

Download citation: RISBibTeXText

DOI: 10.1080/07060669509500705

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