354 EXPERIMENT STATION RECOED. [Vol.38 



l)og:iin in 1915, in wiiicli individual (lower clusters, branches, and considerable 

 portions of trees were protected in various ways from insects and from rain. 



It was found tbat a considerable portion of the branches showed infection 

 when protected against the entrance of insects but not protected against rain. 

 Where a tree was protected both from rain drip and from insects, no blight 

 infection occurred. Branches covered with four cheesecloth bags, above which, 

 on the same tree, w^ere artificially inoculated blo.ssoms, showed heavy infec- 

 tion. Other data are presented which indicate that rain acts as a carrier of 

 fire blight bacteria. 



Citrus blast, a new bacterial disease, R. W. Hodgson {Mo. Bill. Com. Hort. 

 Cal., 6 {1917), No. 6, pp. 229-233, figs. 2).— The author gives a brief account of 

 his own work and that of Lee, as previously noted (E. S. R., 37, pp. 153. 154), 

 on the disease of citrus due to Bacterium citrarefaciens. Careful pruning is 

 regai'ded as the most hopeful means of control at the present time. 



[Diseases, injuries, and abnormalities of coconut in the Dutch East Indies], 

 P. E. Keuciienius {Tcusmannia, 21 {1911), No. 11-12, pp. 62//-6'35 ) .— It is 

 stated that diseases of coconut have not yet assumed very great importance in 

 the Archipelago. Diseases with their causal organisms named in this con- 

 nection include a leaf spot {Pestalozsia palmariim) , a fungus bud rot {Pythi- 

 iim palmivorum) , a bacterial bud rot {Bacillus coli), a stem bleeding disease 

 {Thielaviopsis ethaccticus) reported previously by Petch (E. S. R., 23, p. 652), 

 and a root rot attributed to a Diplodia. Other phases of abnormality or in- 

 jury include gummosis, fruit deformity, and the effects of lightning. 



Fungus blights of tea in northeast India during the season 1915, A. C. 

 TuNSTALL {Indian Tea Assoc, Sci. Dept. Quart. Jour., No. 2 {1916), pp. 78-16). — 

 This account names as tea leaf diseases in 1015 blister blight {ExobasicUum 

 vexans), copper blight {Lccstadia camelliw). gray blight {Pestalozzia sp.), 

 brown blight {Colletotrichuvi camellice), rim blight {Cladosporium sp. ), and 

 red rust {Cephaleurus vdrescens) ; as stem diseases, thread blight (sterile 

 mycelium, probably a Corticium) and velvet blight; and as root parasites, 

 Hymcnocliwte noxia, Ustulina zonafa, Roscllinia. spp., Thyridaria tarda, and 

 Fomes lucidus. 



Black rot disease of tea, T. Fetch {Dept. Agr. Ceylon Leaflet 2 {1917), pp. 3, 

 fig. 1; Trop. Agr. [Ceylon], 48 {1917), No. S, pp. 156-158, fig. 1).—An account is 

 given of a new disease of tea recently appearing in two districts in the low 

 country. It is characterized by the blackening and fall of the younger leaves, 

 which often remain attached to each other or to the stems (which are also 

 attacked) by the mycelium of the fungus, which is said to be an Hypochnus. 

 The spots on the older leaves and the corky warts on the young stems are 

 not so characteristic. 



The disease occurs in patches scattered over the field, suggesting spore dis- 

 tribution by the wind. The fungus is thought to come from any of several 

 species of jungle plants, though spores have not as yet been observed, nor has 

 the mycelium (though present on old leaves) been found on the blackened 

 young leaves. The disease is named black rot from its analogies to a disease 

 of coffee of the same name in southern India due to an Hypochnus, but 

 possibly a different species from the one here considered. This fungus is 

 found to remain alive for at least two months on prunings left in the field, or 

 to fill with mycelium closed glass dishes containing infected dead leaves, this 

 mycelium producing readily new infection on fresh leaves subsequently intro- 

 duced. 



Bordeaux mixture is recommended as a means for the control of this disease. 



Brown blight of tea, W. McRae and R. D. Anstead {Planters' Chron., 11 

 {1916), No. 1, pp. 2-4; abs. in Internat. Inst. Agr. [Rome'\, Internat. Rev, Sci, 



