310 Fungi, Bacteria und Pathologie. 



ScHRENK, H. VON, On the occurence of Peronospora para- 

 sitlca on cauliflower. (Report Missouri Botanicai Garden. 

 XVI. 1905. p. 121 — 124.) 



During the winter of 1903 the cauliflower plants in a green house 

 of the Missouri Botanicai Gardens were very seriousiy attacked 

 by Peronospora parasitica De Bary. This mildew is very common on 

 various wild plants but the only case of its occurence on cauliflower 

 which seems to have been mentioned is cited by Marchai in France. 

 A number of different spraying mixtures were used with good success. 

 Small amounts of glue were used in the Solutions to make them stick to 

 the leaves better. No other neighbouring greenhouse had a similar attack 

 and the case is of special interest from the isolated and sporadic appe- 

 arance of the fungus. Perley Spaulding. 



Smith, Clayton 0., The Study of the Disease ofSome 

 Fruit Crops in Delaware. (Delaware College Agri- 

 cultural Experiment Station Bulletin. LXX. p. 1 — 16. 2 pl. 

 6 fig. Mar. 1905.) 



I. Leaf-spot on cucurbits (Sphaerella citrulüna [Chesterj Smith n. n. 

 A study is given of Phyllosticta citrullina Chester and of an Asco- 



chyta found growing on a number of kinds of cucurbits. Both were found 

 to belong to the same species, viz. Ascochyta. A. Sphaerella was found 

 present with the disease and from a study of this in connection with the 

 Ascochyta the author concludes that the two species are identica! and 

 that the Sphaerella is the same fungus as Laestadia Cuciirbltaceanim 

 Schw. But since the fungus belongs to the genus Sphaerella the writer 

 places it here with the combination Sphaerella citrullina (Chester) Smith. 



II. A leaf-spot disease of the Egg Plant [Solanum melongena] 

 {Ascochyta lycopersici Brun.). 



From a study of a disease of the egg plant caused by an Asco- 

 chyta, the writer proves that in the earlier stages the fungus might ea- 

 sily be taken for Phyllosticta hortoruin Speg. Inoculations were success- 

 fully made with the Ascochyta upon Solanum melongena, Solanum lyco- 

 persicum, Solanum carolinense, and Datura tatula. An Ascochyta from 

 Solanum carolineae was grown in pure cultures and when inoculatcd on 

 both Solanum melongena and Solanum carolinense caused the same 

 disease as the species from the egg-plant. Should Phyllosticta hortorum 

 prove to be identical with Ascochyta lycopersici, then the former name 

 being the older^ the correct name should be Ascochyta hortorum (Speg.). 



III. Leaf spot on Beans and Cowpeas. (Phyllosticta phaseolina 

 Sacc). 



This disease was studied on lima leaves and other varieties of 

 beans^ and on cowpeas. inoculations with pure cultures of Phyllosticta 

 from leave were made to produce the disease upon linia^ wox, and liidney 

 beans, and cupon cow pears. The fungus fruited imperfectiy upon 

 cowpears. Hedgcock. 



Smith, Ralph E., Fear sc ab. (California Agric. Expt. Station. 

 Bull. 163. 1904. p. 1-- 18.) 



In an average year California produces pears to the value of 

 Dull. 1500000. The pear scab often causes the loss of a good proportion 

 of the crop in unsprayed orchards in years favorable for the fungus. 

 The following recommendations are made for the treatment of the disease. 

 Plow under or clean up dead leaves, spray with lime, sulfur, and salt 

 every other year as late in winter as possible, spray with Bordeaux 

 mixture twice while buds are opening aboiit a week or ten days apart, 

 so as to kill the scab on the bark as the buds swell. 



Perley Spaulding, 



