Abstract
The influence of photoperiod on sporulation of and infection by Helminthosporium turcicum Pass. (Trichometasphaeria turcica Luttrell), the causal agent of northern leaf blight of corn (Zea mays L.), was studied in growth chambers simulating normal, field weather conditions. The results were compared to an epidemic of the disease on sweet corn in Kent County, Ontario, in 1972 during a period of unusual weather conditions. An 8-h photoperiod was required to maintain both the diseased plants in a state of survival and the fungus in a state of repeated sporulating cycles on the plants in the growth chambers. The specific climatic component which could be correlated with growth chamber data was the photoperiod. Extremely wide temperature and rainfall variations from their long term means, and a low average exposure to light, contributed to the progress of the disease.
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