Eumycetes. — Pflanzenkrankheiten. 43 



which the authors have referred to Rhisoctonia Napij West, and R. 

 destruenSj Tassi. In the first case a conidial form appeared in cul- 

 tures, and the authors themselves recognise that their fungus can 

 not belong to the genus Rhisoctonia, since they State in the syste- 

 matic discussion that "/?, Napi should be removed from the genus 

 Rhisoctonia, as it appears to be merely a synonym for Botrytis.'' 



A summary is given of the species of Rhisoctonia which have 

 been recorded for India, with a list for the host plants in each 

 case. E. M. Wakefield (Kew). 



Ajrekar, S. L., On the mode of infection and prevention 

 of the Smut of the Sugar-Cane. (Agric. Journ. India. XL 3. 

 p. 288-295. 1 pl. 1916.) 



The Smut of the Sugar-cane is shown to be spread by the use 

 of sets from diseased canes, which contain the mycelium of the 

 fungus in their tissues. Infection by spores adhering to the sets also 

 takes place, but the attack in this case does not become obvious 

 until the crop is approaching maturity. 



Steeping the sets in copper sulphate Solutions is not only use- 

 less against the smut, but seriously impairs the germination. The 

 only practical method of dealing with the disease is to destroy 

 diseased canes as far as possible, and to avoid using diseased stools 

 for seed purposes. 



Aerial infection of shoots by spores is also probable, but the 

 experiments did not provide direct proof of this. 



E. M. Wakefield (Kew). 



Belgpave, W. N. C, A Root Disease of Plantation Rubber 



in Malaya dueto Paria hypolateritia (Berk.). Preliminary. 



Report. (Agric. Bull. Fed. Malay States. IV. p. 347—350. 1916.) 



A disease of rubber-trees known as "wet-feet", on account of a 



wet rot being produced in the roots and the part of the bole be- 



neath the soil, is attributed to Poria hypolateritia (Berk.). In addi- 



tion to the wet rot, Strands or patches of white mycelium are some- 



times found on the exterior of diseased roots, and brown lines in 



the wood. Fructifications are rarely produced, and are often sterile. 



The disease is spread by contact, hence the adoption of sanitation 



measures as complete as possible is essential. 



E. M. Wakefield (Kew). 



Dastur, J. F., Spraying for Ripe- Rot of the Plan tain Fruit. 

 (Agric. Journ. India. XI. 2. p. 142—149.) 



In spraying experiments for the control of the "ripe-rot" ot 

 Plantain fruits caused by the fungus Gloeosporium miisarum, it was 

 found that infection takes place at such an early stage that to spray 

 after the fruit is set is useless. 



Of the various spraying fluids tried, Burgund}'" mixture was the 

 only one which proved satisfactory. Spraying with Burgundy mix- 

 ture should begin as soon as the "fingers" have opened in June, 

 before the rains set in. In the experiments made the disease was 

 found to be kept in check by spraying thereafter once a month 

 until the fruits were ready for picking. Owing to the bluish blot- 

 ches left on fruit recently sprayed by Burgundy mixture, the last 



