292 PATHOLOGY [Box. Absts., Vol. VII, 



inoculation as small, brown, water-soaked spots on the glumes and that infection proceeds 

 only from the head downward. — Conidia and perithecia are produced in abundance on the 

 attacked parts of the host and the spores may be spread by wind and water. The first natural 

 infection causing the scab, or headblighting, takes place during the latter part of the blos- 

 soming period. The secondary infections follow soon after the primary ones and are the 

 more destructive. The fungus winters over as mycelium and conidia in or on the seed, 

 straw, and soil, and also as undeveloped perithecia. — The ascigerous stage develops in mid- 

 summer on affected plant parts that are kept moist. Development is secured in pure culture 

 on stems of various sorts that are kept uniformly moist. — Rainy and cloudy weather favoi 

 blight attacks. — A marked difference in varietal susceptibility occurs among the spring- 

 wheats. Red Fife and Marquis are among the most susceptible, while Bluestem is the most 

 resistant. — R. S. Kirby. 



2035. Brittlebank, C. C. Tomato diseases. Jour. Dept. Agric. Victoria 18:413-416, 

 920. — Diseases common to tomatoes are described. — /. J. Skinner. 



2036. Clinton, George P. Dry rot. Connecticut [New Haven] Agric. Exp. Sta. Bull, 

 222. 398-400. 1920. — Dry rot fungus, Merulius lacrymans, is reported to have destroyed the 

 floor of an unoccupied cottage in a period of 5 years. Two other cases of similar injury an 

 noted. The fungus works only when abundant moisture is present. When the floor was 

 removed and ventilated no further injury was noticed a year after the precautions were 

 instituted. — Henry Dorsey. 



2037. Cunningham, G. H. Fire-blight. New Zealand Jour. Agric. 21: 137-139. 1920.— 

 Notes concerning the disease, the causal organism [Bacillus amylovorus], and the effects of th< 

 disease as it occurs in New Zealand. — N. J. Giddings. 



2038. FoEX. Quelques causes de degenerescense chez la pomme de terre. [Some causes 

 of degeneracy of potatoes.] Jour. Soc. Nation. Hort. France 21 : 204-207. 1920.— Leaf rol 

 and mosaic assigned as causes of degeneracy of potatoes. Symptoms of these two diseases 

 are briefly described and contrasted. Methods of control such as use of seed from field; 

 free from the diseases and breeding for resistance are recommended. — H. C. Thompson. 



2039. GouGH, Geo C. Wart disease of potatoes. Jour. Roy. Hort. Soc. 45:301-312 

 1919. — The fungus causing this disease (Synchytrium endobioticum) is thought to have beei 

 introduced within the last sixty years, yet it may possibly be indigenous. The disease maj 

 be spread by infected seed, tools and implements, and by feeding diseased materials to ani 

 mals. It is found in every county in England except Suffolk and Cornwall and is obviousi] 

 spreading, imperiling the future of the potato industry. The use of immune varieties givei 

 some promise of control. A bibliography of ninety numbers is appended. — /. K. Shaw. 



2040. Gregory, C. T. Heterosporium leafspot of timothy. Phytopath. 9:576-580 

 1919. — A description of a leafspot disease of timothy caused by Heterosporium phlei n, sp.- 

 /. G. Dickson. 



2041. Harter, L. L., and J. L. Weimer. The surface rot of sweet potatoes. Phytopath 

 9:465-470. 1 pi. 1919. — The writers describe a surface rot due to a species of Fusariuv 

 identical morphologically with Fusarium oxysporum. Control measures are discussed.— 

 J. G. Dickson. 



2042. Landi, Raffaele. Tixmori o galle del colletto e delle radici delle piante fruttifer( 

 (Crown-Gall). [Crown-gall of fruit trees.] Rev. Patol. Veg. 10:87-96. PI. 1-4- 1920.- 

 Crown-gall caused by Bacillus tumefaciens is described as widespread in Italy on a variety o: 

 plants, the peach being injured most severely, next the almond tree, the apricot less, and th< 

 walnut rarely. An organism was isolated which in agar cultures at 32°C. produced small 

 round, whitish colonies. Similar bacteria were isolated from the galls on the different host 

 plants. Literature referring to this disease in Italy is given. — F. M. Blodgett. 



