552 EXPERIMENT STATION RECORD. [Vol. 43 



A stem disease of tea caused by Nectria ciniiabariiia, A. C. Tunstat.l 

 (Calcutta: Criterion Ptg. Works. 1918, pp. 6", pis. Jf). — It lias been fouiul that 

 tea bushes showiug a poor condition were attaclied by a fungus, supposedly a 

 variant form of N. cinnabarina. 



Ilusts on conifers in Pennsylvania, J. F. Adams (Pcnntiiilrunia Sta. Bui. 

 160 {1919), pp. 3-30, figs. 10). — The results are given of observations and col- 

 lections made in various parts of the State, for the most part in the vicinity of 

 State College, on the rusts of conifers, 27 species being reported. 



White pine blister rust, AV. R. Bkown et al. (Bien. Rpt. Forestry Comn. 

 N. H., 1911-18, pp. SG-Jfl, pis. 2). — This gives an account of the nature, intro- 

 duction, spread, and attempts at eradication of the white pine blister rust. 



It is believed that an area once thoroughly worked will not need to be re- 

 worked more than two or three times in order to malte it safe from blister rust 

 in a commercial sense. 



The white pine blister rust, G. C. Cunningham (Ann. Rpt. Crown Land 

 Dcpt. New Brunswick, 51 (1911), pp. 103-106, pis. //).— White pine blister rust 

 (Periderniium strobi) has not yet been observed in New Brunswick, but only 

 a partial survey in a few sections has been made. 



Experimental production of bacterial tumors on pine, J. Dufkenoy 

 (Coinpt. Rend. Acad. Set. [Paris], 169 (1919), No. 12, pp. 5.'/5-.5//7).— Piercing 

 in July, 1918, cambium of sound plants two years old with a needle previously 

 inserted into a tumor, the author obtained cankers in October, 1918, and in 

 July, 1919, resinous tumors. The agent appears to be a Gram-positive coccus 

 (usually intracellular) which is discussed. 



Bacterial canker of poplar, R. R^gnier (Compt. Rend. Acad. Sci. [Paris], 

 169 (1919), No. 2, pp. 85-88). — Giving the result of observations, dating back 

 as far as 1913, on a canker of poplar (Micrococcus populi), which has become 

 a veritable scourge in the Oise and neighboring valleys of France, the author 

 arbitrarily divides the evolution of the canker into five stages which are out- 

 lined. Treatments (which are preventive only) include selection of planting 

 material and if possible its disinfection, selection of localities free from in- 

 fection, destruction by fire of all diseased materials or the utilization of trunks 

 affected with canker, and the destruction of all parasites of popla»r. The canker 

 attacks indifferently the branches and stem of young plants and the trunks of 

 much older plants, 



Brow^n bast, T, Petch (Dept. Agr. Ceylon Leaflet 12 (1919), pp. 2). — This is 

 a condensed account of brown bast of rubber trees as studied in Ceylon. Out- 

 lines of three methods of treatment are given, each aiming at the removal or 

 destruction of the diseased cortex to such a depth that any diseased tissue is 

 destroyed and the formation of nodules prevented. These methods are dis- 

 tinguished respectively as stripping, scraping, and tarring, the last two in- 

 volving the application of Brunolinum plantarium. This is applied at 20 to 

 50 per cent strength according to the widely varying susceptibility of the trees. 



The biology of Polyporus pargamenus, A. S. Rhoads (N. Y. State Col. 

 Forestry, Syracuse Univ., Tech. Pub. 11 (1918), pp. 191, pis. 31, figs. 6).— P. par- 

 gamenus, one of the most common wood destroying fungi, causes sap rot of 

 most of the species of dicotyledonous trees occurring throughout the wide range 

 of this fungus. It is usually saprophytic, attacking particularly felled wood 

 with the bark still on, although it frequently becomes a wound parasite, par- 

 ticularly on trees injured by fire. 



The species appears to consist of a number of intergrading forms, often be- 

 coming sufficiently distinct to constitute varietal forms or subspecies. It is 

 advocated that these varietal forms be recognized, particularly for the con- 

 venience of the critical worker. 



