760 EXPERIMENT STATION EECOED. 



rest of the leaf, while the convex unclei--siirface is ji dull, powdery gray, 

 changing to pure white when mature. 



The disease spreads from the leaves to the leaf stalks and to the young green 

 stems, where the spots elongate and increase in size until the stem is girdled, 

 thus causing the upper part to wilt and die. 



The disease spreads rapidly, especially in regions of frequent rainfall, and is 

 very injurious to heavily pruned bushes, often defoliating the entire plant. 



Three methods of control have been tried, viz, picking off diseased material, 

 pruning, and spraying with fungicides. Picking was fairly etiicient during the 

 early attacks of the fungus, but under weather conditions suitable for the spread 

 of the disease was not successful in controlling it. Spraying with Bordeaux mix- 

 ture at certain stations proved very effective both in checking the ravages of the 

 disease and in preventing fresh outbreaks, but in regions of heavy rainfall the 

 fungicide did' not remain long enough on the leaves to prevent incipient blisters 

 from maturing. In seed beds, new extensions, and heavy pruning, however, 

 where the area is small, the labor and expense of repeated spraying would be well 

 repaid by saving the plants. During cold weather the main remedy should 

 consist of pruning out all infected growth and the destruction of the diseased 

 prunings by burning or by burying them under at least li ft. of earth. 



Report on a disease in tea seed nurseries, G. D. Hope {Indian Tea Assoc. 

 [PainjiIiUt] .'), ]<I09, i)}). 6, pis. 3). — The results are given of investigations on 

 the disease which attacked nursery tea seedlings in the Dibrugarh and Doom 

 Dooma districts of Assam during the season of 1909. 



This disease appeared about the end of June in the upper Assam tea districts, 

 and in some instances as much as 50 per cent of the seedlings turned black from 

 the topmost shoot downward. The side leaves assumed a coppery appearance in 

 patches, and eventually the shoot died. 



It is claimed that the disease is caused by the peculiar climatic conditions 

 which prevailed throughout these districts during 1909. In the early part of the 

 season there was a prolonged drought, followed by continuous and heavy rains 

 for about two weeks, and immediately succeeded by several extremely hot days 

 during which the disease appeared and many see<llings died. 

 ■ The diseases of Hevea brasiliensis, X. Patouillakd (-Joiir. Agr. Tro})., JO 

 (1910), No. 108, pp. 170, 111). — A brief description is given of the root disease 

 of H. brasiliensis, due presumably to some hymeuomycete, followed by a list of 

 fungi which attack the leaves, branches, and fruit of Hevea. 



Another Para rubber fungus, H. N. Ridley (Afjr. Bui. Straits and Fed. 

 Malay States, 9 (1!)10), Xo. 6, pp. 216-218). — A description is given of the 

 fungus in the trunlvs of Para rubber trees, which, after the tree is dead, forms 

 an irregular, oval-shaped, black, hard and rather brittle crust from I'g to § in. 

 thick and from 1 to 10 in. in diameter beneath the outer corky layer of bark, 

 which has split off in places. 



One tree 25 years old and 2 ft. in diameter died suddenly without previous 

 evidence of disease, and this fungus came out on the wood some weeks later. 

 Trees adjacent to this have died in much the same manner. 



A section of diseased wood was sent to Kew for examination. According to 

 G. Massee the fungus belongs to the genus Eutypa and will be called E. eanlivora 

 n. sp. A constant feature of this genus is that the fungus persistently remains 

 in a vegetative and aggressive condition in the body of the tree until the host 

 is dead, and then comes to the surface to produce fruit. As the fungus does 

 not fruit until after the tree is dead, it is suggested that it could be readily con- 

 trolled 1)y de.^troying all dead trees and timber in or near the plantations. 



On the nonoccurrence of rust uredo-sori on the needles of conifers, K. vo.\ 

 TuBEUF iXaturw. Ztsclir. Forst u. Landic, 8 {1910), No. 7, pp. 3i6-3',9).— It is 



