152 MISC. PUBLICATION 499, U. S. DEPT. OF AGRICULTURE 
(1715) YaRwoop, CEecIL. 
1932. REVERSIBLE PHOTOTROPISM OF THE GERM TUBES OF CLOVER POWDERY 
MILDEW. (Abstract) Phytopathology 22: 31. 
(1716) 
1934. EFFECT OF MILDEW AND RUST INFECTION ON DRY WEIGHT AND RESPIRA- 
TION OF EXCISED CLOVER LEAFLETS. Jour. Agr. Res. 49: 549-558. 
(1717) 
1934. THE COMPARATIVE BEHAVIOR OF FOUR CLOVER-LEAF PARASITES ON EX- 
CISED LEAVES. Phytopathology 24: 797-806. 
(1718) 
. 1986. THE DIURNAL CYCLE OF THE POWDERY MILDEW, ERYSIPHE POLYGONI. 
Jour, Agr. Res. 52: 645-657. 
(1719) 
1936. HOST RANGE AND PHYSIOLOGIC SPECIALIZATION OF RED CLOVER POWDERY 
MinpEw. Jour. Agr. Res. 52: 659-665. 
(1720) 
1936. THE TOLERANCE OF ERYSIPHE POLYGONI AND CERTAIN OTHER POWDERY 
MILDEWS TO LOW HUMIDITY. Phytopathology 26: 845-859. 
(1721) 
1939. RELATION OF MOISTURE TO INFECTION WITH SOME DOWNY MILDEWS AND 
RUSTS. Phytopathology 29: 933-945. 
(1722) 
1939. AN OVERWINTERING PYCNIDIAL STAGE OF CICINNOBOLUS. Mycologia 
31: 420-422. 
(1728) 
1942. sTIMULATORY AND TOXIC EFFECTS OF COPPER SPRAYS ON POWDERY - 
MILDEWs. Amer. Jour. Bot. 29: 1382-135. 
(1724) YosHINo, K. 
1905. A LIST OF THE PARASITIC FUNGI COLLECTED IN THE PROVINCE OF HIG6O. 
Bot. Mag. [Tokyo] 19: 87-103, 199-222. 
(1725) Youne, P. A. 
1936. SCLEROTINIA ROT OF SQUASH AND PUMPKIN. Phytopathology 26: 
184-190. 
(1726) Youne, W. J. 
1923. CLOVER ROOT ROTS AND POWDERY MILDEW. Ohio Agr. Expt. Sta. 
Monthly Bul. 8: 157-160. 
(1727) 
1924. AN INVESTIGATION OF CLOVER ROOT ROT. (Abstract) Phytopathology 
14: 63. 
(1728) ZaDE. 
1922. DIE ANERKENNUNG VON KLEE UND GRASERN. Deut. Landw. Gesell. 
Mitt. 37: 384-885. 
(1729) ZIMMERMAN, A. 
1926. SAMMELREFERATE UBER DIE BEZIEHUNGEN ZWISCHEN PARASIT UND 
WIRTSPFLANZE. Zentbl. f. Bakt. [ete.] (11) 69: 352-425. 
(1730) Zork, K. 
1927. KLEEKREBS. Getreide, Saaten, Diinger u. Futtermarkt 33 (438): 
854-857. 
(1731) ZWEIGBOUMOVNA, ZOFJA. 
1925. GRZYRYOKOLIC SKIERNIEWIC. Soc. Bot. Poloniae Acta 2: 275-301. 
(Rey. App. Mycol. 4:507. 1925.) 
(1732) Zounvpen, G. L. IL., and BARNHART, J. H. 
1939. USTILAGINALES. ADDITIONS AND CORRECTIONS. North Amer. Fi. 7 
(14) : 971-1045. 
ADDENDUM 
(1733) Jones, F. R. 
1943. ASCOCHYTA MELILOTI (TREL.) DAVIS AS THE CONIDIAL STAGE OF 
MYCOSPHAERELLA LETHALIS STONE. Wis. Acad. Sci., Arts, and Let- 
ters, Trans. (In press). (Ascochyta lethalis Ell. and Barth. 
is made a synonym of A. caulicola Laub.) 
O 
