DISEASES OF PLANTS. 47 



surface as a yellowish brown patch, while the upper surface is now of a 

 grayish color. During the earlier stages the diseased areas are covered with 

 minute black spots, due to the presence of pycnidia situated just below the 

 epidermis of the leaf. The blight spreads with extreme rapidity and attacks 

 only the older leaves. 



Plucking and burnmg the diseased leaves and spraying with Bordeaux 

 mixture are suggested as possible remedies. 



Root diseases of tea, T. Petch (Circs, and Agr. Jour. Roy. Bot. Oard. 

 Ceylon, 5 (1910), No. 11, pp. 95-ll.'i, pis. 2). — Five root diseases of tea have 

 been investigated, and are here listed in order of prevalence : Ustulina zonata, 

 HymenochcBte noxia, Poria hypolaterita, Botryodiplodia theohroma;, and 

 Roscllinia bothrina. The distinguishing marks and symptoms of each disease 

 are given, and methods of treatment suggested. 



Root diseases of Acacia decurrens, T. Petch (Circs, and Agr. Jour. Roy. 

 Bot. Card. Ceylon, 5 (1910), No. 10, pp. 89-9 Jt, pis. 3).— The author describes 

 two root diseases of this tree. One, due to ArmiUaria fuscipes, causes the 

 death of trees 15 mouths old or over which are used as windbreaks in tea 

 plantations, but the fungus apparently does not attack the tea; the other, 

 Fomes uustralis, a common jungle fungus, attacks old ti-ees of A. decurrens, at 

 Hakgala, slowly and gradually killing them. 



Uprooting and burning the diseased trees is suggested as a probable remedy 

 for checking further dissemination. 



The spruce scab (Lophodermium macrosporum), E. Mer (Bui. Sac. Sci. 

 Nancy, 3. scr., 11 (1910). No. /, ])p. 1-59). — ^The first and major portion of this 

 paper is a reprint of a previous article on this subject (E. S. R., 24, p. 453) 

 by the same author, while the second and concluding i)art discusses the damage 

 done by this fungus and suggests preventive and curative measures (E. S. R., 

 24, p. 251). 



Some new parasitic fungi of ornamental plants, G. Trinchieki (Bui. Orto 

 Bot. R. Univ. Napoli, 2 (1910), No. //, pp. }t95-50Jt). — In addition to 4 species 

 previously noted (E. S. R., 23, p. 355) the author describes as new Macrophoma 

 dyckiw on the scapes of Dyckia sulphurca, Ascochyta haicorthiw on the scapes 

 of HawortJiia tortuosa, and Clicetomella gasteriw on the scapes of Gasteria 

 fuscopwuctatd. 



Spray injury induced by lime-sulphur preparations, E. Wallace (New 

 York Cornell Sta. Bui. 288, pp. 105-137, pis. 4). — This bulletin gives the results 

 of experiments with lime-sulphur mixtures, arsenical preparations, and com- 

 binations of the two on fruit and foliage injury to fruit trees, especially apples 

 and peaches. 



It was found that the method of application is a very important factor, as 

 overdrenching of the trees seemed likely to cause burning of the foliage. Arsenite 

 ot lime, arsenite of soda, or Paris green is likely to cause serious foliage 

 injury, while arsenate of lead decreased to some extent the caustic properties 

 of lime-sulphur sprays and seemed to be the only arsenical that could be used 

 with the lime sulphur on apple foliage. However, lime-sulphur and arsenate 

 of lead mixture when applied with a gas sprayer may produce some injury to 

 apple foliage, and certainly caused serious defoliation of peach trees in the 

 tests made. 



The addition of lime or the retention of the sediment of the lime-sulphur 

 solution affected very little the amount of foliage injury. Precipitation of 

 lime-sulphur solution alone by the carbon dioxid of the gas sprayer prevented 

 any caustic action on peach foliage, even at a strength of 1:30, and with no 

 apparent diminution of its fungicidal properties. Infection of apple leaves 

 with the scab fungus previous to the application of the spray was one of the 



