652 EXPERIMENT STATION RECOBB. [Vol. 87 



celery, that the temperature of the solution bears an important relation to the 

 amount of injury produced. 



A brief description is given of a rot of tomato fruit due to an undetermined 

 species of Phytophthora. This disease, which is called buckeye rot, is to be 

 the subject of a special publication. Brief notes are given on bacterial diseases 

 of celery, lettuce, peppers, tomato, and potato, and on fungus diseases of a 

 number of other vegetables. 



In connection with the pineapple wilt studied by the author, in which study 

 field observations and laboratory experiments were carried on, nematodes were 

 found in almost every instance to be the cause of some of the injury. In addi- 

 tion to nematodes, Thielaviop»is paradoxa was found to attack the roots and 

 stems of pineapples, causing considerable loss. 



Report of the laboratory assistant in plant pathology, J. Matz (Florida 

 Sta. Rpt. 1916. pp. 99-112, figs. 7). — The author reports upon his investigations 

 on pecan dieback and the leaf blight of the fig. 



The investigations of the dieback are in continuation of those previously de- 

 scribed (E. S. R., 35, p. 849). Experiments in controlling the organism. Bo- 

 tryosphcpria berengeriaruL, have been continued, and pruning dead wood from 

 the trees has been found satisfactory in keeping down the disease. Spraying 

 with lime-sulphur solution did not seem to have any effect. 



The leaf blight of fig is de.scribed as characterized by a yellowish, water- 

 soaked appearance on both surfaces of the leaves. The twigs and fruit may be 

 infected by the spreading mycelium, although the blight is primarily one of the 

 leaves. An organism has been isolated which experiments have shown to be 

 the cause of the trouble and wliich has been determined as Rhizoctonia 

 microsclfrotia n. sp. 



[Plant diseases in New Jersey, 1915], M. T. CJook (Ann. Rpt. N. J. Bd. Agr.. 

 43 (1916), pp. 48-54): — Besides notes on plant disea.ses, 214 of which were ob- 

 served during 1915, and mention of the four epidemics of economic diseases oc- 

 curring in New Jersey during the year, namely, fire blight of pear and apple, 

 anthracnose of bean, mosaic of tomato, and Rhizoctonia of potato, the author 

 reports more specifically on potato diseases, including .scab, leaf roll, blackleg, 

 discolorations (Fusarium oxysporttm and F. radidcola), and powdery scab 

 (Spongospora subterranea), also on some preliminary experiments regarding 

 the control of the diseases, the results of which varied considerably. The ad- 

 ministrative report for 1915 of the State plant pathologist is included. 



fPungns pests and their control] (Imp. Dept. Agi\ West Indies, Rpt. Agr. 

 Dept. St. Vincent, 1915-16, pp. 24S0). — The information here given relates to 

 both insect enemies (particularly thrips on cacao) and fungxis diseases of 

 plants, with a discussion of conditions and remedial measures. Speciraena were 

 examined of arrowroot rhizomes affected with the so-called burning disease, 

 which appears to be due to Rosellinia bunodcs. Internal boll di-sease of cotton 

 is thought to be related to the pre.sence of cotton stainers. 



Some parasitic fungi of Japan, T. Hemmi (Bot. Mag. [Tokyo]. SO (1916), 

 No. S58, pp. SS4-S44, figs. 5). — A discussion is given of Clasterosporium degen- 

 erans on Prunus mume, Septoria perilcr on Pcrilla ocimoides. and Arwateila 

 Htsecp, on Litsea glanca, and a discussion with technical descriptions of the new 

 species SeptogUeum niisirntB on Quercut dentata and Septoria petatitidit on 

 Petasites japonica. 



Combating nematodes by the use of calcium cyanamid. J. R. Watson 

 (Florida Sta. Rpt. 19 J6. pp. 55-63). — In addition to a previous account (E. S. 

 R., 37, p. 453), the author describes experiments in the use of calcium cyanamid 

 for the control of nematodes, particularly with tomatoes, peach trees, and pine- 

 apples. 



