II. — Collar Rot. 

 [Hendersonina Sacchari, But), n. g., n. sp.) 



In the last section a disease was described which has fre- 

 quently been mistaken for red rot. A second disease is sometimes 

 confused with red rot in India, and the following description may 

 lead to its recognition and thus secure further information reo-ard- 

 ing its distribution and the amount of injury it causes the crop, 

 points on which our observations are incomplete. 



Towards the end of 1908, a number of canes withered at the 

 Samalkota Sugarcane Station, following on a cyclone at the end of 

 September, which did much harm to the crop. A recrudescence 

 of red rot was feared, as many of the canes were reddened at the 

 base. We examined the crop in January, 1909, and found ex- 

 tremely little true red rot. Some of the damage was apparently 

 not caused by disease but by injury to the root system as a result 

 of the storm. A good many cases were seen, however, in which 

 the symptoms suggested the action of a definite parasite at the 

 base of the plant, and a fungus was isolated from the tissues in 

 these cases which proved capable of reproducing the disease. 



In the following season the disease reappeared and was more 

 fully studied, but for the last three years there have been no 

 further records of its occurrence on this farm. Recently it has 

 been found at Jorhat Farm in Assam, and it is possible that it 

 also exists in the Central Provinces, where we have observed a 

 somewhat similar condition, but without being able to make a 

 detailed examination. It has not been recorded elsewhere, and 

 the parasite differs so widely from any previously known that it 

 has been necessary to make it the type of a new genus. The 

 varieties of cane so far observed to have been attacked are Red 

 Mauritius, Striped Mauritius and B. 208. 



