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TEA 171 



satisfactory remedy is to cut and burn the affected 

 parts as soon as the disease appears. 



A leaf spot very closely resembling the grey blight 

 is caused by Guignardia thea, Bernard. 



Pestalozzia palmarum, Cooke, is a disease of the 

 Coco-nut which is said to attack the tea. 



Brown Blight. This disease is due to the fungus 

 Colletotrichum camelliae, Massee, and is especially severe 

 in the seed gardens. It originates on the upper surface 

 of the leaf, as yellowish brown spots which gradually 

 increase in size, often extending to the edge of the leaf. 

 When the leaf is held to the light a yellowish band 

 is seen round the affected area, due to the spreading 

 of the mycelium into the healthy tissues area of the 

 leaf, which loses its green colour. The central parts 

 of the spots often break out leaving ragged perforations. 

 The fungus produces the characteristic Colletotrichum 

 spores, which are readily carried by the wind. 



This disease has been reported from Ceylon, Assam, 

 and South India. It has no doubt frequently been 

 confused with the grey blight, and since it attacks the 

 younger parts of the plant, -some planters have been 

 inclined to look upon it as being more severe. This 

 disease should be treated in the same manner as the 

 grey blight. A very fine spray of Bordeaux mixture 

 will also prove advantageous. 



Rim Blight or Marginal Corrosion. This is a com- 

 bination of the grey and the brown blights, and is much 

 more severe than either of the above. It causes the 

 leaves to shrivel and turn brown, beginning at the 

 edges. It should be treated as recommended for the 

 grey and brown blights. 



Blister Blight or White Blister. This disease has 

 been reported from India. It has been described by 

 Watt and Mann as follows : 



It first appears as a minute pale brown or pinkish spot on 

 the upper surface of the leaf. This enlarges in size, mostly in 

 a perfectly circular manner, gradually becomes depressed into a 

 pit about the size to admit the tip of the little finger, is smooth, 



