Moisture Effects on the Discharge and Survival of Conidia ofSeptoria tritici

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Abstract
The effect of relative humidity (RH) on the discharge of conidia of S. tritici [speckled leaf blotch of wheat] and their longevity in cirri was tested by suspending pycnidia in leaf lesions above water and solutions of NaCl and NaOH in sealed test tubes held at 25 .+-. 0.2.degree. C in a water bath. Pycnidia held for 48 h at about 100% RH discharged twice as many conidias as those held at 98%, and 11-23 times as many as those held at 86%. Conidia in cirri on top of pycnidia remained 100% viable for 15 days in atmospheres of 35, 45, 55, 65, 75 and 85% RH. Between the 15th and 20th day viability of conidia held at 65% and above dropped to 5-10%, then declined to less than 2% by the 30th day, and to 0 by the 50th day. At 55% RH, 60% of the conidia were viable, and at 45 and 35% RH, 80% were viable after 60 days. Conidia within pycinidia held at 35% RH were 100% viable after 132 days.

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