DISEASES OF PLANTS. 55 



aplturoutly not being affected. It is infectious and the climatic condition of 

 Florida appears to favor its rapid spread. In addition to Florida it is known to 

 occur also in Alabama and may exist in Texas. 



Tbe author recommends the careful inspection of nursery stock, the destruc- 

 tion by burning of small affected trees, and the pruning off and burning of all 

 diseased parts of larger trees. 



[Root diseases of lime trees in Dominica], H. A. Tempany {Imp. Dcpt. Agr. 

 West Indies, Rpt. Ayr. Dcpt. Dominica, 1!) 1 2-13, pp. d-l'i)- — 'I'lie author gives 

 an account of investigations by F. A. South on stem canker diseases of lime 

 trees, the black root disease due to Rosellinia sp., and the red root disease 

 caused by Sphcerostilbe sp., together with suggestions for their control so far as 

 definite means are known. 



A leaf disease of papaya, A. Maublanc {Bol. Uin. Agr., Indus, e Com. 

 [Brazil], 2 (1913), No. 1, pp. 126-130, pi. i).— This is substantially the same 

 as an article previously noted from another source (E. S. R., 29, p. 848). 



[Recent mycological tours], A. C. Tunstall {Indian Tea Assoc., Sci. Dept. 

 Quart. Jour., 1912, No. 4, PP- 105-108). — This is a brief account of tours through 

 several districts, noting the presence and relative importance to tea growers of 

 Ustulina zonata, Hymenochwte noxia, Cephaleuros virescens, La;stadia thcoB,' 

 and Botryodiplodia theobromw in the different sections. H. noxia was found 

 apparently spreading through the medium of a wooden fence along which the 

 adjacent tea bushes were dying from this fungiis. 



Mycologist's notes, A. C. Tunstall {Indian Tea Assoc, Sci. Dept. Quai't. 

 Jour., 1913, No. 1, pp. 30-32). — The author reports some observations made on 

 plant disorders while visiting several stations. 



Hymenochwte noxia was the most prevalent of the root diseases of tea met 

 with. Ustulina zoiiata was found on tea in a few gardens. Rosellinia, observed 

 in some shady patches of tea, had apparently done harm in only one case. 

 Blister blight of the leaves, due to Exobasidium vexans, was seen as early as 

 January, the starting places showing signs of having borne a continued crop 

 of fungus throughout the cold weather. Removal of infection centers has con- 

 siderably reduced this blight. Copper blight {Lcestadia thew), though common, 

 appears to do but little damage. ^ 



[Some diseases of tea], A. C. Tunstall (Indian Tea Assoc., Sci. Dept. 

 Quart. Jour., 1913, No. 4, PP- 104-106). — A description is given of die-back due 

 to Oloeosporium sp., blister blight, and canker. 



The die-back, it is said, may be conti'olled by spraying with Bordeaux mix- 

 ture. The blister blight, caused by Exobasidium vexans, has been studied at 

 considerable length and no evidence has been found that it occurs on any other 

 plant than tea. It is considered probable that the disease must pass the winter 

 in an active state on the tea plant itself, and that thorough spraying with 

 Bordeaux mixture or similar fungicide would probably control it. Studies on 

 the cause of canker have failed to show how the fungus enters the plant, and 

 thus far no definite means for killing it have been discovered. 



Fungi parasitic on the tea plant in northeast India, I, A. C. Tunstall 

 (Indian Tea Assoc, Sci. Dept. Quart. Jour., 1913, No. 4, pp. 100-103) .—The 

 author describes attacks of Pythium debaryanum and Mucor mucedo on tea 

 plants. 



[Mosquito blight of tea], P. H. Carpenter (Indian Tea Assoc, Sci. Dept. 

 Quart. Jour., 1912, No. Jf, pp. 104, 105). — Reporting an inspection tour in 

 several districts, the author notes that in Cachar the most important pest 

 found is mosquito blight. This appeared to be worse in 1912 than for many 

 years past. It is said to affect tea grown on a peat soil earlier and more se- 



48456°— No. 1—14 5 



