Summary
Sporangial formation was found restricted within the range of temperature from 20–31° C. Atmospheric humidity of 100 % did not favour very much in developing sporangia. Free water appeared to be essential in sporangial formation. The range of temperature within which the liberation of zoospores took place was even narrower, 19 to 25° C. Temperature from 21 to 23° C appeared to be best condition for maximum liberation of zoospores. Similarly as with sporangial development atmospheric humidity as high as 100 % had very little effect on the liberation of zoospores unless there was condensation of water. The liberated zoospores in free water were found to germinate only within 20–24° C. At about 22° C the germination rate was found optimum.
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Husain, M., Ahmed, Q.A. Studies on the sporulation of Phytophthora parasitica Dastur var. piperina Dast. Responsible for Leaf and Foot-rot of Pan, Piper betle. L.. Mycopathologia et Mycologia Applicata 14, 24–30 (1961). https://doi.org/10.1007/BF02051434
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DOI: https://doi.org/10.1007/BF02051434