DI8EASE8 OF PLANTS. 263 



with r number of distinct species of Solanum were tested for disease resistance. The 

 relative resistance of the different varieties is given in tabular form, marked differ- 

 ences being shown. Of the established varieties tested Rusl Proof, Sutton I Hscovery, 

 June, Mexican, Mammoth Gem, and Manum Nn. :; were the mosl resistant, their 

 power of resistance being in proportion to the order of enumeration. 



Resistance to the rot of the tubers and to scab was also investigated, and attempts 

 are being continued in the development of plant-, by hybridization and -election 

 pf seedlings, that will be more resistant than those now in use. 



Potato rot in New Zealand, C. T. Musson {Agr. Gaz. X. S. Wales, 16 I 1905), 

 jVo. 5, pp. {23-428, fig. 1). — The author suggests special precautions against the intro- 

 duction of diseased tubers, and the breeding of new varieties of potatoes which have 

 a greater resistant power. 



Spraying the plants with Bordeaux mixture is advised to prevenl the disease from 

 spreading, and the red-skinned varieties are said to be less liable to attack. For 

 white-skinned ones deep planting is recommended to minimize the chance of tubers 

 being affected, and it is said that nitrogenous manures render the plants more sus- 

 ceptible to disease, while potash manures assist them in resisting attack. 



Diseases of melons and cucumbers during- 1903 and 1904, .1. L. Sheldon 

 | West Virginia Sta. Bui. 94, pp. 121- 138, pis. 5, fig. /). — Brief notes are given on the 

 leaf spot (Cercospora citruUina), downy mildew I Plasmopara cubensis), leaf mold or 

 blight i Alternaria brassica nigrescens), and damping off, due to Fusarium sp. 



The results of the author's investigations on the anthracnose i Colletotrichum lage- 

 narium | are given at some length. The author describes cultures of the fungus, the 

 germination of the spores, development of the mycelium, etc.. and gives the results 

 of inoculation experiments that were made to determine whether the fungus causing 

 the disease known as anthracnose of the watermelon could produce anthracnose in 

 other plants. Inoculations were made from pure cultures and from watermelon 

 bruits into a number of other plants, and the anthracnose was successfully produced 

 on muskmelons, cucumbers, gourds, and watermelons. Failures are reported in all 

 the attempts to inoculate heans, and doubtful results wen- obtained with inoculations 

 of squashes and a few other plants. 



Experiments were carried on for the prevention and control of anthracnose, in 

 winch plats were sprayed with soda Bordeaux, Bordeaux mixture, and ammoniacal 



popper carl ate. The results of the applications showed considerable difference 



between the -prayed and unsprayed plats, ami, considering the improved quality of 

 the melons and the reduced amount of anthracnose, it appears that Bpraying with 

 Bordeaux mixture was quite successful in combating the disease. The use of the 

 ammoniacal copper carbonate solution was less beneficial. 



Bacteria in relation to plant diseases, E. F. Smith I Washington, I>. C: Car- 

 negii Institution of Washington, 1905, vol.1, pp. Ml 285, pis. 31, figs. 146).— This is 

 the first volume of a proposed monograph of the diseases of plants due to bacteria. 



In the completed work the author hopes to present the evidence of the bacterial 

 Origin of a large number of plant diseases, many of which have been personally 

 Btudied by him. This publication is intended as a supplement to the numerous text- 



1 ks of bacteriology, and while designed primarily for plant pathologists, it will be 



found valuable to nil students of bacteriology. The literature relating to the bac- 

 terial diseases of plant- i- bo scattered that all students will welcome its bringing 

 together into an orderly arrangement by a competent investigator. 



In the first volume the methods of work are described in detail. The morphology 



and physiology of the organisms are discussed at length, after which the economic 



aspects of bacterial diseases of plants are considered. The author then takes up 

 laboratory methods, describing the more approved apparatus, and gives formulas for 



stains, media, etc. An extensive bibliography to literature i- given, the arrangement 

 being chronological by topics. 



