750 EXPERIMENT STATION RECORD. [Vol.43 



than infected untreated seed. No fertilizers increased the percentage of clean 

 tubers from untreated (visibly) clean seed, though with untreated infected 

 seed a small percentage of increase of clean tubers was obtained over the un- 

 fertilized plats, sulphur being most effective in this respect. Bordeaux spray 

 increased neither yield nor clean tubers. Rhizoctonia disease was found on 

 a number of hosts not previously reported. Cases cited are the dying out of 

 strawberry beds, particularly in western Wa.shington, and a severe attack on 

 onions, previously supposed to be immune to Rhizoctonia. 



In experiments with oat smut, the dry method gave better results than were 

 given by the sack, sprinkle, and dry or Haskell methods. The percentage of 

 smut varied with the time of planting, ranging upward to a maximum from the 

 earliest and then showing a fluctuating decline. Both varietal and regional 

 resistance to disease are noted. 



Review of diseases of cultivated plants in 1918, C. Fekdinandsen and 

 S. RosTEUP {Tidsskr. Planteavl, 26 (1919), No. J,, pp. G8S-7S3, fig. i).— This 

 review includes both diseases and insect enemies of field and garden plants, 

 covering a wide systematic range. 



Destruction of zoospores of plant disease organisms by natural enemies, 

 R, B. Harvey (Science, n. ser., 52 (1920), No. 1334, p. 8^).— The author reports 

 observing, while making photomicrographs of the liberation of zoospores from 

 the sporangia of Physoderma zem maydis, the destruction of the zoospores by 

 certain auimalcules which are commonly found, in decaying vegetable matter. 

 One infusorian (Keronia sp.) was observed to devour a perfect stream of the 

 zoospores of Physoderma, at the same time increasing in size until it became 

 gorged almost beyond recognition. The author thinks it would be desirable to 

 determine just how important such animalcules are as natural enemies of those 

 plant diseases which are disseminated by zoospores. 



Emission and germination of spores by Leptosphseria herpotrichoides, 

 E. FoEX (Bui. Soc. Path. Veg. France, 6 (1919), No. 3, pp. 43, .57-6i).— Particu- 

 lars are given of the behavior of ascospores under conditions indicated. 



Biological studies on Botrytis cinerea, M. BiJSGEN (Flora. [Jena], n. ser., 

 11-12 (1918). pp. 606-620). — This account includes lists of plants found to be 

 susceptible or innnune to B. cinerea. 



The supposed parasitism of Coprinus radians, P. M. Biers (Bui. Sbc. Path. 

 Veg. France, 6 (1919), No. 3, pp. 63, 72-74). — Evidence is discussed regarding 

 the alleged parasitism of C. radians, the perfect form of Ozonium auricomum. 



The probable parasitism of Coprinus, P. M. Biers (Bui. Soc. Path. Veg. 

 France, 6 (1919), No. 6, pp. 151, 159, 160). — A case is mentioned of apparent 

 parasitism of Broussonetia by a Coprinus, probably C. domesticus. 



Foot disease of wheat, E. Foex (Bui. Soc. Path. Teg. France, 6 (1919), No. 3, 

 pp. 43, 52-56). — An account is given of observations made during 1913-14 in the 

 Paris basin on foot or stalk disease of wheat. It is stated that cereals in this 

 region are attacked frequently by Leptosphceria herpotrichoides, more rarely by 

 Ophiol)olus graminis. Both are here discussed. Addition of sodium nitrate to 

 the soil in spring is thought to aid in combating cereal stalk disease. 



Glume spot of wheat, J. H. Grisdale (Canada Expt. Farms Rpt. 1919, 

 p. 60). — An investigation has been made of the glume spot of wheat due to 

 Septoria glumarum, in which experiments on the date of planting, source and 

 quality of seed, variety, seed treatment, and soil treatment were made. While 

 the results were inconclusi%e, they are believed to emphasize the importance of 

 early planting and the use of good seed in localities where the disease is likely 

 to occur. 



Partial smutting of wheat heads, E. Foex (Bui. Soc. Path. Veg. France, 

 6 (1919), No. 5, pp. 100, 105, 106). — An account with discussion is given of the 



