EFFECTS OF TEMPERATURE AND DURATION OF DEW PERIOD ON GERMINATION OF RUST UREDIOSPORES ON CORN LEAVES

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Abstract
An outbreak of rust (Puccinia sorghi) on susceptible corn cultivars in Quebec appeared attributable to favorable environmental conditions. Minimum temperature for germination of urediospores of P. sorghi on water agar was between 2 and 5 C, optimum between 10 and 25 C, and maximum between 30 and 35 C. Urediospores on corn leaves in a dew chamber began to germinate within 3 hr between 9 and 18.5 C. Dew periods longer than 3 hr at 1.5–18.5 C did not increase germination percentage significantly. Urediospores were maintained on dry corn leaves in a greenhouse for 16 days. Plants were transferred from the greenhouse to a dew chamber at daily intervals to determine viability of the spores. Germination percentage remained fairly constant up to 6 days, then declined to about 40% after 16 days’ exposure on dry leaves.

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