1918] DISEASES OF PLANTS. 355 



and Pract. Agr., 7 (1916), No. 5, pp. 757, 758). — Browu blight {CoUetotrichum 

 camellia!) is noted as having caiised damage in some localities which are named. 

 The disease is described and directions are given for its control. The author 

 recommends, for the nurseries, removal of affected leaves, spraying with Bor- 

 deaux mixture, application of slaked lime to beds, freer admission of light and 

 air to the nurseries, and careful watering when any is necessary ; for older 

 plants, modifications of these measures with avoidance of manures tending to 

 produce sappy wood and heavy foliage and the use of those tending to produce 

 harder wood. 



[Mycological notes], A. C. Tunstajx {Indian Tea Assoc, Sci. Dept. Quart. 

 Jour., No. 2 (1916), pp. 82-86). — The author recommends the substitution, for 

 the lever or directly acting spray pumps now in common use, of a wheel and 

 eccentric action to economize labor and equalize wear on the machinery, also 

 of a nozzle capable of producing a very fine but abundant spray close up to the 

 nozzle. The nozzle should be replaceable, owing to the rapid wear to which it 

 is subjected, and to minimize this the use of glass nozzles is suggested. The 

 apparatus should be very simple, durable, and easy of operation to minimize the 

 bad effects of unskilled handling. 



Rim blight was noticeable on severely pruned tea plants. It was less notice- 

 able on those which had been sprayed with caustic washes used to relieve a 

 barkbound condition. It is thought best to employ this early in the cold season 

 to avoid giving the tea a setback. Bordeaux mixture applied in March or April 

 is considered more suitable for healthy and vigorous plants. 



Basic problems in forest patholog'y, E. P. Meinecke (Jour. Forestry, IS 

 (1917), No. 2, pp. 215-22-4). — The great problems of forest pathology now de- 

 manding attention in this country are designated as those of silviculture during 

 the necessary period of transition from virgin forests (still almost universal in 

 the United States) to regulated forests (as now prevalent in Europe). The 

 author emphasizes the need of shaping and carrying out policies for minimizing 

 as much as possible the cumulative losses from various agencies, as previously 

 noted (E. S. R., 35, p. 43). 



Polyporus schweinitzii, J. M. Murray (Trans. Roy. Scot. Arbor. Soc., SO 

 (1916), pt. 1, pp. 56, 57, pi. 1 ; ahs. in Interyiat. Inst. Agr. [Rome], Internal. Rev. 

 Sci. and Pract. Agr., 7 (1916), No. 5, p. 759). — It is stated that P. schweinitzii, 

 long known to attack (but not very severely) a number of conifers in Europe 

 and to be destructive in the northern forests of spruce and fir in the United 

 States, but hitherto considered as rare in the British Isles, is supposed to be 

 increasing there so as to threaten the coniferous forests. Several species have 

 now been attacked by it in this region. The appearance, development, and 

 effects of the fungus are described. Protective measures suggested include cut- 

 ting off affected roots beyond all signs of rot, tarring the wounds thus made, 

 collection and destruction of young sporophores, and the replacement of badly 

 attacked conifers with hardwood trees. 



White pine blister rust disease, A. F. Hawes (d.nn. Rpt. State Forester Vt., 

 8 (1916), pp. 22-26). — A very brief account is given regarding the history of 

 the white pint blister rust (Cronartium ribicola) in this country, the control 

 measures attempted therewith, and the general results therefrom, also regard- 

 ing inspection work done in Vermont between May 15 and July 1, 1915, the 

 results of which are presented in tabular form. 



Diagnosing white pine blister rust from its mycelium, R. H. Colley (U. S. 

 Dept. Agr., Jour. Agr. Research, 11 (1917), No. 6, pp. 281-286, pi. 1, fig. 1).— 

 According to the author, by the use of safranin and lichtgi'uen, it is possible to 

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