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



lobolus late in the season will distinguish this disease. Other susceptible hosts are Hordeum 

 sativum, Secale cereale, Hordeum murinum, Bromus sterilis, and Agropyron repens. Control 

 measures suggested are burning of stubble, rotation, deep tillage and heavy applications of 

 lime. Good drainage is an important factor in control, and the land must be kept free from 

 susceptible plants. — N. J. Giddings. 



1209. Waters, R. Take-all disease in whea\ New Zealand Jour. Agric. 20:287-288. 

 1920. — Cultures of Ophiobolus graminis were secured from ascospores. On standard agar the 

 mycelium was white. There was no evidence of fruiting in culture. Wheat plants from dis- 

 infected seed grown in sterilized soil were inoculated by placing near the plant a bit of medium 

 containing the fungus. Four inoculated plants died in from 28 to 36 days, while controls 

 were in good condition at the end of 58 days. Re-isolations were secured from the rootlets 

 of some of the dead plants. Several other methods of inoculation gave no infection. — A''. /. 

 Giddings. 



1210. Welten, Heinz. Pflanzenkrankheiten. [Plant diseases.] 199 p., 5 pi., 76 fig. 

 Phil Reclam, Jr. : Leipzig, 1919. 



1211. Whipple, O. B. Degeneration in potatoes. Montana Agric. Exp. Sta. Bull. 130. 

 29 p., 16 fig. Apr., 1919. — The results are given from five-years' work upon potato projects. 

 Degeneration includes various potato ailments which are not, so far as known, traceable to 

 the attacks of parasitic organisms, and includes spindle sprout, curly dwarf, and probably 

 mosaic and leaf roll. Characteristic symptoms are the loss of vigor of the plant, and a cor- 

 responding loss in yielding power. For control it is necessary to turn to seed selection and 

 better cultural methods. In the experiments the plots were planted on the tuber-unit and 

 tuber-line plan. Regarding spindle sprout and yellow top, probably a stage of spindle sprout, 

 the deterioration is apparently sudden and complete, and may be brought about by improper 

 storage of the tubers or unfavorable growing conditions.— Curly-dwarf is the most serious 

 condition. It is a gradual deterioration; the transition from normal to curly dwarf covers a 

 period of two, three, or more seasons. Supposed mosaic degenerates have in their behavior 

 resembled typical curly-dwarfs and are in this paper so considered. The first indications of 

 curly dwarf are a slight crinkling and reduction in the size of the leaf. A plant showing the 

 above foliage symptoms would be classed as an intermediate. Experiments prove that inter- 

 mediates of one season are, as a rule, the curly dwarfs of the next. Tubers from curly- 

 dwarf vines if planted produce no marketable tubers. Tubers from degenerate types are, 

 as a rule, shallow-eyed, when compound with those from normal vigorous plants, and efforts 

 to improve the type of tubers by the selection of shallow-eyed seed tubers should be under- 

 taken, according to the author, with extreme caution.— H. E. Morris. 



1212. White, E. W. Apple-tree Anthracnose or Black Spot Canker. Agric. Jour. [British 

 Columbia] 4: 206-207. 1919. 



1213. Wolf, F. A. Report of the Division of Plant Pathology and Bacteriology. North 

 Carolina Agric. Exp. Sta. Ann. Rept. 42:65. 1920.— Subject matter of this report is cov- 

 ered in bulletin on clover stem rot in: North Carolina Agric. Exp. Sta. Bull. 16: 15-18. S pi. 

 1919. [See Bot. Absts. 3, Entry 1669.]— F. A. Wolf. 



ERADICATION AND CONTROL 



1214. Anonymous. La "anthracnosis" de la vid. [Anthracnose of the grape.] Infor- 

 macion Agric. [Madrid] 10: 153. 1920.— Treatment for grape anthracnose {Gloeosporium 

 ampelophagum) . — John A. Stevenson. 



1215. Anonymous. Tumores bacterianos. [Bacterial tumors.] Informacion Agric. 

 [Madrid] 10: 170-171. 2 fig. 1920.— The nature and control of the olive knot disease due to 

 Bacterium savastanoi). — John A. Stevenson. 



