246 EXPERIMENT STATION RECORD. [Vol. 43 



sotunacearum), root knot {Heterodera radicicola), root rot (Thielavin hasi- 

 cola), sore sluink {Rhizoctonia solani, Curticiuin ragum), luosair, freucbing, 

 wildfire (B. tabacum), angular leaf spot (B. angulatuvi) , common leaf spot, 

 frog eye {Cercospora nicotiancc) , and crookneck. 



Control of late bliglit of tomatoes in the IJlue Ridge mountains, R. A. 

 JEHLE, J. W. Goodman, and J. W. Lindley {Bui. N. C. Dept. Agr., 1,0 {1919), 

 No. 11, pp. 3-16, flgs. 7). — I^ate blight as reported in North Carolina appears to 

 be practically limited to the mountainous part of the State, being most de- 

 structive and prevalent in elevations above 2,000 ft., and increasing upward 

 in this respect. It lias been known in Avery and Mitchell Counties for more 

 than 15 years, causing much injury. Attempts at control have been in most 

 cases wholly or partially unsuccessful. Characteristics of the disease, which 

 is caused by Phytophthora infestans, are described. 



An account is given of work conducted in the two counties above mentioned. 

 It has been found that late blight is controlled by spraying thoroughly with 

 a 5 : 5 : 50 Bordeaux mixture every 10 days or 2 weeks, beginning as soon as 

 the plants start growth after transplanting, and continuing during the season. 

 The addition of 2J lbs. of resin fish oil soap to the Bordeaux mixture gave in- 

 creased yields only when Septoria leaf spot was present. Spraying is facili- 

 tated by staking the plants or tying them to some support. 



Some fungus diseases of fruit trees, H. Wormald {Fruit, Flower, and Veg. 

 Trades' Jour. [London^, 36 {W19), Nos. 25, pp. 679, 681, fig. 1; 26, pp. 705, 707, 

 figs. 3; 37 (1920), Nos. 1, p. 5, figs. 3; 2, pp. S3, 35, flgs. 2).— Besides a general 

 discussion of fi-uit-tree diseases and remedies, the author gives a more par- 

 ticular account of apple and pear black spot or scab, Venturia pomi {Fusicla- 

 dium dendriticum ; apple mildew {Podosphwra leucotricha) ; apple canker 

 {Nectria dltissima; brown rot diseases, MonUia {Sclerotinia) fructigena and 

 M. cinerea; silver leaf disease {Stereum purpureum) ; American gooseberry 

 mildew (Sphwrotheca mors-urw) ; European gooseberry mildew {Micro- 

 sphwra grossulariw) ; die-back of gooseberry bushes, Botrytis cinerea {Scle- 

 rotinia fiuikeliana) ; cherry leaf scorch {Chiomonia erythrostoma) ; peach 

 leaf curl {Exoascus deformans) ; and crown gall {Bacterium tumefaciens). 



The brown rot diseases of fruit trees, with special reference to two bio- 

 logic forms of Monilia cinerea, II, H. Wormald {Ann. Bot. [London], 34 

 {1920), No. 131,, pp. 11,3-171, pis. 2).-7-Au account is given of experimentation 

 showing that the two biological forms of M. cinerea can be distinguished in 

 the laboratory by the employment of biochemical methods. There is also a 

 discussion of the value of the application of cultural methods in taxonomy, as 

 illustrated by certain distinguishing characters exhibited by M. fructigena, 

 M. cinerea, and an American form of Monilia when grown in pure cultures. 

 It is claimed that there are in Britain two species of Monilia parasitic on 

 Pyrus and Prunus, namely, M. {Sclerotinia) fructigena and M. cinerea, the dis- 

 tinguishing characteristics, occurrence, and behavior of which are discussed. 



The destruction of Ribes by chemical means, W. S. Regan {Amer. Plant 

 Pest Com. Bui. J, [1919], p. i2).^Study during three years of various chemicals 

 for killing currant and gooseberry bushes has been made in the effort to find 

 a cheaper means of desti'oying tliese plants than hand pulling. Fuel oil and 

 dip oil have given good results, which are outlined in connection with a brief 

 account of the treatment. 



" Die-back " of tlie fig in California, I. J. Condit and H. J. Stevens {Fig 

 and Olive Jour., J, {1919), No. 4, pp. 11, 12). — Within the last two or three years, . 

 reports have been made in California of a peculiar die-back of the fig tree, 

 appearing in the spring as the young shoots begin to push out. 



