158 EXPERIMENT STATION RECORD. [Vol.40 



received from Florida. One-half of the main roots of the stalks were dead, 

 while of those alive, 45 per cent were infested. While sugar cane has been 

 known to be a host for this nematode, such serious infestation does not seem 

 to have been previously reported. 



Some important diseases of sweet potato, C. D. Sherbakoff (Quart. Bui. 

 Vlnnt Bd. Fla., 2 {1918), No. J,, pp. 119-189, figs. 6).— The author discusses 

 mainly the material presented in the bulletin by Harter (E. S. R., 35, p. 49) 

 according to the grouping of diseases made therein. 



Peach yellows and peach rosette, J. B. S. NORTON {Mo. Bui. Cal. Com. Jlort., 

 6 (1917), Xo. 7, pp. 282-286, figs. S).— This is a brief account of the causation 

 and progress of peach yellows and peach rosette and of control measures 

 therefor. 



A few insects and diseases common to small fruits, F. II. Dudley (Bui. 

 [Maine] Dept. Agr., 17 (1918), No. S, pp. 22-27).— Besides mention of raspberry 

 cane borer, cane maggot, and Bawfly, ami the giant root borer of the black- 

 berry, notes are gven on raspberry crown gall {Bacterium tumefaciens), cane 

 blight, ami anthracnose; strawberry leal spot (Myoosphwrella fragaria); and 

 blackberry crown gall, cane knot, red rust (I'un-inia vnterstitiaUe) , and an- 

 tbracnose. 



Comparisons between effects of basic and of acid copper sprays, J. Caims 

 {Rev. Vit., 'i7 (11>17). No. 1818, pp. 880 882).— Add and alkaline sprays applied 

 2$ days before a rain were found to be equally prompt ami eiheacious as regards 

 their fungicidal effects, which were entirely satisfactory. Atmospheric condi- 

 tions constitute a very important factor. The effects of the alkaline spr;i>s 

 arc much more Lasting than those of the add preparations. 



Diseases and enemies of cacao in Ecuador and modern methods of cacao 

 cultivation. .1. 1'.. EtOBEB, trans, by a. Pachano {Bnfermedadet y Plaoas </<■/ 

 Cacao en <i Ecuador u Mctudos Modernoa Appropriate* a\ Cultivo del cacao. 

 Ambato, Ecuador^ Assoc. Agr. Ecuador, [ 19181, i>i>. 80, figs. 12). The three main 

 parts of this report, which is based mainly upon observations made by the 

 author in the months of November ami December, 1917, deal respectively with 

 the various cacao diseases and pests in Ecuador, modern methods of c;icao 

 culture, and economic considerations in this connection. 



Melanose of citrus, H. S. I'awci it (Un. Bui. Cal. Com. lh>rt., 6 {1917), No. 7. 

 pp. 180, 281, fig. t). — This is a brief descriptive and historical account of citrus 

 melanose (PttomopaiS citri). 



Florida citrus diseases, H. E. STEVENS (Florida Bto. Bui. 150 {1918), pp. 18- 

 110. Jigs. J/!').- This bulletin has been prepared as an attempt to bring together 

 information regarding all the common citrus diseases that occur in Florida. 

 While primarily intended for the consideration of fungus and bacteria] dis- 

 eases, the publication also includes a few other diseases and injuries due to 

 various causes. The information given is for the most part the result of the 

 author's personal investigation and observation, although he has drawn upon 

 other sources for data regarding different diseases. Under control methods, 

 the author describes the best and latest treatment for combating the disc:; 



Preventing wood rot in pecan trees, S. M. AicMURBAN (U. S. Dept. .\gr., 

 Fanners' Bui. 995 (1918), pp. 8, figs. JO).— The author popularly describes the 

 wood rot of pecan trees which follows improper pruning, etc., and gives sug- 

 gestions for the control of the rot, the principal means recommended he! im- 

 proper pruning and protection of wounds. 



Some bacterial diseases of orchids, (J. L. PAVABINO {AtU 1st. Bot., Univ. 

 Pavia, 2. scr., 15 (1918), pp. 81-88. pi. 7).— From diseased portions of orchids. 

 the author claims to have isolated organisms which are described as new 



