Publisher's Synopsis
Excerpt from Memoirs of the Department of Agriculture in India, Vol. 1: Cephaleuros Virescens, Kunze, the 'Red Rust' of Tea
Still another cause exists preventing excessive reproduction. The time during which the 'haken-sporangia' remain ripe and capable of producing zoospores is very limited, amounting as a rule to only a few days. After this they take on a darker colour, perfectly recognizable to the eye, and then cease to respond to the addition Of water. Hence it is Obvious that unless rain or dew or watering of some kind occurs during the short period when the sporangia are capable of reproduction, their capacity for disseminating the disease is lost.
In summary, it may, therefore, be said that the spread of the alga is kept in check by several means. The first is connected with the difficulty of wetting the algal patch and the sporangia and so not allowing the emergence Of zoospores during the time these are in a suitable condition. This fact may, of course, as we have-indicated, tell also in the opposite direction by prevent ing the rupture Of immature sporangia. Again, excessive mois ture leads to the production of few reproductive organs, or even of none, and so limits the spread of the disease during the height of the rainy season. And, thirdly, the length Of time during which any particular sporangium head is capable of producing zoospores in contact with water is short, not exceeding a very few days.
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