174 PATHOLOGY [BoT. Absts., Vol. VII, 



1166. Reed, George M. Varietal resistance and susceptibility of oats to powdery mildew, 

 crown rust, and smuts. Missouri Agric. Exp. Sta. Res. Bull. 37. U p. 1920. — The resist- 

 ance of oats, Avena spp., to powdery mildew (Erysiphe graminis DC. f. avenae), crown rust 

 (Puccinia coronata Corda), loose smut (Ustilago avenae (Pers.) Jens.), and covered smut 

 {Ustilago levis (K & S.) Magn.) was tested by inoculation experiments. Of 98 varieties and 

 strains belonging to 14 species, tested with powdery mildew, negative results were obtained 

 onlj' with Avena bromoides and ^. sempervriens. Vigorous infection occurred on all cultivated 

 species. Of 132 strains and varieties belonging to 7 species, tested with crown rust, all were 

 found susceptible, the least infection being 42 per cent, on Avena brevis. Of 154 varieties 

 and strains belonging to 7 species tested with loose smut in the field during 5 seasons, Ave7ia 

 brevis, Avena sativa var. nigra, the variety Black Mesdag, and Avena strigosa gave consist- 

 ently negative results; Burt, Earlj- Ripe, Fulghum and other varieties of Avena sterilis gave 

 very low percentages of infection, while the Avena nv.da group proved entirely suscept'ble. 

 One hundred and forty-six varieties and strains were tested with covered smut during four 

 seasons, and in general they reacted to this test in the same way as they did to loose smut. — 

 L. J. Stadler. 



1167. SuEMATSu, Naoji, and Kikuji Ktjwatsuka. Studies on the varietal resistance 

 of the peach to artificial inoculations with Gloeosporium laeticolor Berk. Ann. Phytopath. 

 Soc. Japan 1': 1-12. 1920. — Experiments in which 66 varieties of peach important in Japan 

 were inoculated proved that none are resistant. Various degrees of susceptibility were found, 

 and two varieties, Tachibanawase and Jitsugetsuto, which ripen early and possess good 

 qualities, proved to be especially resistant. Seven other varieties, which possess somewhat 

 less desirable qualities, . are also especially resistant. Chinese species are generally more 

 resistant than the Persian. No evidences of biologic forms of the fungus, nor of the phe- 

 nomenon of "adaptation" were found.—//. M. Massey. 



DESCRIPTIVE PLANT PATHOLOGY 



1168. Anonymous. Forestry, tree diseases and timber. [Rev. of: Rankin, W. H. 

 Manual of tree diseases. XX + 398 p. Macmillan & Co.: New York and London, 1918.] 



Nature 105:579. 1920.— "The first American text book on the subject The 



account of Keithia thvyina, a dangerous fungus which has recently appeared in England on 

 the valuable forest tree, Thuya gigantea, is of considerable interest." — 0. A. Stevens. 



1169. Anonymous. Black scab in potatoes. Jour. Dept. Agric. Ireland 20:238-241. 

 3 fig. 1920. 



1170. Anonymous. Potato leaf-curl. Jour. Ministry Agric. Great Britain 27:287-289. 

 2 fig. 1920. — A brief popular description of potato leaf-curl, including a discussion of the 

 cause and control. — M. B. McKay. 



1171. Ball, E. D., and F. A. Fenton. Potato leaf hopper and the leafburn. Potato 

 Mag. 212:6-7. 2 fi^. 1920. 



1172. Bewley, W. F. "Damping off" of tomato seedlings. Jour. Ministry Agric. Great 

 Britain 27: 670-673. 1920. — An abridged account of an investigation to be published in full 

 in the Annals of Applied Biology, vol. 7, No. 2, 1920. 



1173. Birmingham, W. A. Crown gall of fruit trees. Agric. Gaz. New South Wales 31: 

 717-718. 3 fig. 1920. — A brief description of the disease is given with suggestions as to 

 preventive measures. Destruction of the diseased tree is recommended. Grafts may be 

 treated with bluestone paste before planting. — L. R. Waldron. 



1174. Birmingham, W. A. Root rot of fruit trees due to Armillaria mellea. Agric. Gaz. 

 New South Wales 31:669-673. 4 fig- 1920.— The appearance of various varieties affected 

 by the disease, methods of dissemination, effect of the disease and control measures are 

 given. "Bluestone paste" may be applied to cut root surfaces after the necessary root 

 pruning has been done. — L. R. Waldron. 



