No. 1, May, 1921] PATHOLOGY 75 



510. Melchers, L. E. The resistance shown by three hard winter wheats, Kanred 

 (P762), P1066, and P1068 to plant diseases. [Abstract.] Phytopath. 10: 52. 1920. 



511. Melchers, Leo E., and John H. Parker. The resistance of Kanred (P762), P1066, 

 and P1068, three hard winter wheats, to leaf rust. [Abstract.] Phytopath. 10: 52-53. 1920. 



512. RuMBOLD, Caroline. Causes for the production of pathological xylem in the injected 

 trunks of chestnut trees. Phytopath. 10: 23-33. 2 pi. 1920. — The author concludes that the 

 production of pathological xylem in the phloem region of the trunks of injected chestnut 

 trees [Castanea dentata] is due to (1) the mechanical severance of vascular tissues, and (2) 

 the chemical stimulation of cells. — /. G. Dickson. 



513. WooDWORTH, C. M., AND FLORENCE CoERPER Brown. Studies on Varietal resistance 

 and susceptibility to bacterial blight of the soy bean. [Abstract.] Phytopath. 10: 68. 1920. 



THE PATHOGENE (BIOLOGY, INFECTION PHENOMENA, DISPERSAL) 



514. Clayton, E. E. The relation of soil temperature to the development of the tomato 

 Fusarium wilt. [Abstract.] Phytopath. 10: 63-64. 1920. 



515. HuNGERFORD, Chas. W., AND A. E. Wade. Relation between soil moisture and bunt 

 Infection in wheat. [Abstract.] Phytopath. 10: 53. 1920, 



516. Jones, L. R., and H. H. McKinney. The influence of soil temperature on the 

 development of potato scab. [Abstract.] Phytopath. 10: 63. 1920. 



517. MacInnes, Jean. The effect of temperature and light on Fusarium sp. causing 

 wheat scab. [Abstract.] Phytopath. 10: 52. 1920. 



518. RosENBAUM, J. Infection experiments on tomatoes with Phytophthora terrestria 

 Sherb. and a hot water treatment of the fruit. Phytopath. 10: 101-105. 1920. — The writer 

 found that because of its efifect on zoospore liberation, an abundant moisture supply in dis- 

 eased soil is necessary to produce an epidemic infection with P. terrestria. The addition of 

 copper sulphate solution (1 : 5000) to infested soil prevented infection of green tomatoes when 

 in contact with the soil. The immersion of green tomatoes in water at 60°C. for I5 minutes 

 prevents spread of the rot where the infection is very recent and the fungus has not pene- 

 trated deeply into the tissues. — /. G. Dickson. 



519. RosENBAUM, J. Studies with Macrosporitmi from tomatoes. Phytopath. 10:9-22. 

 2 pi., 1 jig. 1920. — A study of the early blight, or "nail head" spot, of the tomato is sum- 

 marized, the author drawing the following conclusions : Infection takes place without previous 

 injury to the fruit, however only on the immature fruit; the disease does not originate in 

 transit on mature fruit picked from an infected field, but it may develop in transit on imma- 

 ture fruit picked from infected fields; the disease does not spread from infected fruit to adja- 

 cent healthy fruit in transit. The author concludes that the causal organism of the "nail 

 head" spots on fruits, stems, and leaves of the tomato is different specifically from Macro- 

 sporium solani from potatoes and suggests the use of the binomial M. tomato Cooke. — J. G. 

 Dickson. 



520. TisDALE, W. B. The relation of soil temperature and soil moisture to the occurrence 

 of cabbage yellows. [Abstract.] Phytopath. 10: 63. 1920. 



521. White, J. H. On the biology of Femes applanatus (Pers.) Wallr. Trans. Roy. 

 Canadian Inst. 12^ : 133-174. PI. 2-7, fig. 1-2. 1920.— The investigations have followed along 

 three main lines of inquiry: (1) The study of the morphology and ecology of F. applanatus 

 and of the action on its host; (2) a determination of etiological relationships by culture 

 methods, and a testing of the applicability of such methods to a study of timber destroying 



