No. 1, July, 1920] PATHOLOGY 203 



cause. It is stated that there is ":i very definite area of susceptibility surrounding the calyx 

 end of the fruit," and that anatomioal studies of this area showed it to he relatively inade- 

 quately provided with vascular tissue. — (!. W. Kcitt. 



1342. Rose, I). If. Infection as related to humidity and temperature. [ Rev. of Lai.hit/ • 



J. I. The relation of temperature and humidity to infection by certain fungi. Phytopath. 

 9:1-35. 1919. (See Bot. Absts. 3, Entry 2679.)] Hot. Qas. 68:66-47. 1919. 



1343. Rosen, II R. Ergot on Paspalum. Mycologia 12:4(M1. 1920. 



1344. Rosenfeld, A. II. Kavangire: Porto Rico's mosaic disease-resisting cane. Intel 

 nat. Sugar Jour. 22:26 33. 1920. 



1345. Rutgers, A. A. L. Bliksemschade bij Hevea. (Effect of lightning on Hevea.| 

 Arch. Rubbercult. Nederlandsch-Indle 3:103-171. 1919. — Four types of lightning injury 

 are discussed. Single trees or groups of trees are killed; or a few trees in a group may be 

 killed, the others showing injury; or strips of bark are killed, in some cases in a spiral around 

 the tree. Vertical lightning scars are sometimes found on the stem, which after healing show 

 characteristic scars that cannot lie mistaken. Weeping trees I hat show a number of small 

 lightning scars high up in the stem are the result of lightning. Finally, the scaling off of the 

 outer bark ("scurf") is probably caused by lightning. — W. E. Cake. 



1340. Rutgers, A. A. L. Voorschriften voor de bestrijding van bastziekten bij Hevea 

 uitgegeven door het Algemeen Proefstation der Avros, October 1917. [Instructions for the com- 

 bating of bark diseases in Hevea.] Arch. Rubbercult. Nederlandsch-Indle 2: 55-57. 1918. — 

 Abstract in Dutch and English of a circular on the treatment of stripe canker (black thread 

 disease), patch canker, brown bast disease, and burrs, issued by the General Experimental 

 Station of the association of rubber planters of the East Coast of Sumatra. — //. //. Bartlett. 



1347. Sanders, G. E. Apple spraying in 1919 (sic). Fruit Growers' Assoc. Nova Scotia 

 Ann Rept. 55: 110-11S. 1919. — The dropping of the fruit and burning of the foliage of apple 

 (Pyrus Mains) when lime sulphur sprays (particularly the fourth spray) are used is said to have 

 been greater in years 1914, 1915, 1916, and 1917, in which the weather was cold and dull, than 

 in the preceding four years, which were warmer. The following sprays are recommended: 

 (1) Bordeaux mixture (3:10:40); (2) Bordeaux mixture (2:10:40); (3) Soluble sulphur (1:40); 

 (4) Bordeaux mixture (2:10:40). It is stated that at least three parts of lime must be used 

 to one part of copper sulphate. — Paul A. Murphy. 



134S. Schander, R. Beobachtungen und Versuche iiber Kartoffeln und Kartoffelkrank- 

 heiten im Sommer 1917. [Observations and investigations of potatoes and potato diseases in 

 1917.] Fiihling's Landw. Zeitg. 67:204-226. 1 fig. 1918.— See Bot. Absts. 3, Entry 2751; 

 4, Entry 1913. 



1349. Schmitz, Henry. Studies in the physiology of the fungi VI. The relation of bacteria 

 to cellulose fermentation induced by fungi, with special reference to the decay of wood. Ann. 

 Missouri Bot. Card. 6: 93-136. 1919— See Bot. Absts. 4, Entry 1518. 



1350. Scofield, C. S. Cotton roo trot spots. Jour. Agric. Res. 18: 305-310. 7 fig. 1919. 

 — Rootrot of cotton (Phymatotrichum omnivorum) occurs in well defined areas in cotton fields. 

 When land is cropped continuously to cotton it is found that "the disease does not continue to 

 reappear in successive seasons in the same spots." — Records taken from field plots show that 

 since 1912 there has been a marked increase in the number of plants dying from root rot but 

 the losses from this source were noticeably less in 1917 and 1918 than in 1916. — D. Reddick. 



1351. Shapoyai.ov, M. Is the common potato scab controllable by mere rotation of crops. 

 Phytopath. 9: 422-124. 1 fig. 1919. — From experiments involving the growth of Actinomyces 

 scabies upon filter paper for two years, the author concludes that endeavors to eradicate the 

 scab fungus from the soil by rotation methods are likely to be unsuccessful. — //. //. Mc Kinney. 



