46 EXPERIMENT STATION EECORD. 



is called to a rot of bananas very common on the fruit offered for sale in the 

 markets. This is probably due to O. musaruin, a fungus closely related to 

 G. fructigenmn. the cause of bitter rot of apples. 



A descrii)tion is giAcn of a leaf spot of ivy produced by P. hedericola. 



Cacao and Hevea canker, T. Fetch (Circs, and Agr. Jour. Roy. Bot. Oard. 

 Ceylon, 5 {1910), No. 13, pp. lJf3-180). — After a general discussion of the liter- 

 ature bearing on the cacao pod rot and canker, the author gives the results of 

 inoculation experiments with the cacao Phytophthora on the pods and stems 

 of cacao and Ilevea. A description of the fungus (P. fahcri), symptoms of 

 the disease on cacao and Hevea, and methods of treatment are also given. 



Both stem canker and pod rot were produced by introducing Phytophthora 

 cultures into the pods and stems of cacao and Hevea, while inoculations with 

 various species of Nectria on both cacao and Hevea gave negative results. The 

 author, therefore, concludes that stem canker and fruit rot of both cacao and 

 Hevea are due to the same organism, P. faheri. 



The treatment of cacao canker and pod disease comes under 4 heads, viz, 

 excision of diseased tissues, collection of diseased pods, removal of shade 

 and spraying. The location and character of the disease, whether on the stems 

 or pods, determine which of these remedies should be used, as well as the type 

 of the plantation, whether heavily shaded or interplanted with Hevea. The 

 results of various spraying experiments are given, but the cost in most cases 

 seemed prohibitive compared to the results obtained. 



A root disease of Hevea, T. Petch {Circs, and Agr. Jour. Roy. Bot. Gard. 

 Ceylon, 5 {1910), No. 8, pp. 65-71, pis. 2). — A description is given of the root 

 disease of Hevea due to Sphwrostilbe repetis, while sources of infection and 

 methods of treatment are also discussed. 



The fungus develops freely on pieces of jak wood and on decaying jak 

 stumps; these should, therefore, be kept out of Hevea plantations. Dead 

 Hevea trees should be dug up with as much of the roots as possible and 

 burned. Any neighboring stumps, especially jak stumps, and all pieces of 

 woods and roots should also be burned; and since the disease can be spread 

 by rhizomorphs through the soil to adjacent trees, the affected area should be 

 isolated by trenches about 1 ft. deep, and the inclosed ground should be 

 dug up and treated with quicklime. 



Pink disease of Para rubber and Bordeaux mixture, R. D. Anstead {Plant- 

 ers' Gliron., 6 {1911), No. 8, pp. 98-101). — In the experiments reported, over 

 200,000 trees were treated for pink disease {Corticimn javaniciim) with a 

 6 : 4 : 45 Bordeaux mixture to which some type of sticker had been added. The 

 mixture was applied with a brush to the trunk, special attention being given 

 to the forks and whorls of branches, where it was well rubbed in. 



The best time for the first application was found to be during May and June, 

 while a second application seemed to be unnecessary. On one plantation the 

 treated area showed only 0.56 per cent of the disease, or less than 1 tree per acre, 

 while the untreated trees gave 1.34 per cent, or 2 diseased trees per acre. 

 Practically similar results were obtained on the other plantations. It is stated 

 that if every tree is properly treated with this mixture, there will be no cases 

 of the disease. 



The copper blight of tea, F. J. F. Shaw {Agr. Jour. India, 6 {1911), No. 

 1, pp. 78, 79). — The symptoms of this disease, which is attributed to Lcestadia 

 thece, are described, and its probable identity with a similar blight previously 

 reported from Assam is suggested. 



The fungus, which was found on dried leaves from Dooars, produces small, 

 irregular, copper-colored spots on the upper surface of the leaves. Later, 

 the discoloration extends entirely through the leaf, appearing on the under 



