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B
Puccinia
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C
Cephaleuros parasiticus Karst
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D
Phytophthora
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Solution
The correct option is CCephaleuros parasiticus Karst
'Red rust' caused by Cephaleuros parasiticus Karst is the most important and lone algal disease of tea. The trivival name of this disease is a misnomer. The cell contents of the genus, Cephaleuros are orange red, hence the misapplication of the name rust. The disease is widespread and important in India, Sri Lanka, Africa and America. It attacks all kinds of tea plants both young and old when vitality is impaired. It is occurring on tea plants in many parts of India.
So, the correct answer is ' Cephaleuros parasiticus Karst'.