756 EXPERIMENT STATION RECORD. [Vol. 37 



to summer drought. Wrapping the trees with sacking for about 4 ft. above 

 the ground practically prevented the trouble. 



Notes on pecan diseases, S. M. McMitsran {Amcr. Nut Jour., ^ {1016), So. 6, 

 pp. 81, 86. fl(js. 3). — In a bkuk of pecan trees sprayed for scab with Bordeaux 

 mixture live times about two weeks apart, from May 29 to August 8. 1914. the 

 brown leaf spot disease {Cenofpnra fusca) was effectively controlled, while the 

 uusprayed trees were almost defoliated by September. Nursery leaf blight 

 ( I'hyllosticta caryce) was controlled with from three to five sprayings. A de- 

 foliation of pecan occurring in southern Louisiana in late summer appeared to 

 be associated with water supply. A dieback observed at a point in Louisiana and 

 one in Georgia were apparently due to soil and seasonal conditions. Black pit, a 

 nut disease said not to have been described previously, is thought to be nonpara- 

 sitic in charMcter. 



Blight and melaxuma of walnut, C. W. Bkers (Amer. Sut Jour., 4 {1916), 

 No. 2. pp. 18. 19. 21. Pus. S). — Both blight and melaxuma of walnut are re- 

 ported to have been brought under study and control. 



An investigation of forest tree diseases. (J. M. Kked. LrctLE Keene, Jessie 

 Cline. and Emily H.\ri)E.sty {Missouri Sta. liul. 11,1 (1911), pp. 2S. 2P).— The 

 authors report having collecte<l a numi>er of polyporous fungi on living trees 

 during the year, among them Forneys fraxinophilus on ash. F. robiiiiw on black 

 locu.st. and F. ct'crhartii on oak. Studies on fungi connected with the decay of 

 fence iwsts are said to be in progress. 



Boleti and mycorrhiza upon forest trees and an unusual mycorrhiza upon 

 white oak. L. H. rKNMNOToN (Alts, in I'hj/tnixiiholo;)}/. 7 (1911). \o. 1, p. 7-J). — 

 Six species of Boletus are reported as connectetl with mycorrhiza of forest 

 trees, usually oaks. A jioculiar form of mycorrhiza found upon white-oak roots 

 is briefly described. Attempts to inoculate the nx)ts of other trees with this 

 fungus have thus far faile«l. 



Blight-resistant chestnuts from China, G. H. Corsan (.ivicr. Nut Jour., 2 

 (1915), No. 4' P- 54. fiiix- 2). — The author notes the observations made by 

 Meyer in the course of studies carrietl out by him in northern China (E. S. R., 35, 

 pp. 29, 140) regarding the high resistance of a Chinese chestnut {Castanea 

 miiUissimn) to chestnut bligiit, the wounds caused by the attack on this species 

 healing spontaneously. 



Breeding chestnuts for disease control {Amrr. Nut Jour.. 4 (1916), No. 4, 

 pp. 56. 51. figs. ^). — Brief mention is made of work in progress in the testing 

 of hybrids between the American native chinquapin and Japanese chestnut. 

 The Fi and F, hybrids are highly resistant to the chestnut bark disease and show 

 other desirable charncters. as do also four gentMntions of hybrids between Jap- 

 anese and Chinese chestnuts. 



Violent outbreak of Oidium on oak in France, K. Nofkbay {Jour. Agr. Prat., 

 n. aer., 29 (1916), No. 19, p. 326). — A brief description Is given of the mode of 

 attack by OTdium on oak. which, it is SJild, has not ceased since the time of its 

 introduction to cause damage and which is becoming serious in Sologne 



Oidium on oak. F. Convert (Jour. Agr. Prat., n. srr., 29 (1916), No. 20, pp. 

 S43. S.'fi). — The author, replying to the article noted above, states that an 

 American onk which does well in Fnince is resistant to Oidium. 



American oaks resistant to Oidium in Sologne, E. Nofkray' (Jour. .\gr. Prat., 

 n. scr., 30 {1917), No. 8, pp. 54. 55). — Following up the information note<l above, 

 the author made examination of a number of oaks of the American species 

 Qucrcus pa/twtrig in Sologne, finding them practically free from attack by 

 Oidium. 



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