24 
Journal of Agricultural Research 
Vol. XXIII, No. I 
(7) The morphology and physiology of the fungus are discussed in 
detail. All forms of spores found in Phytophthora are readily produced 
in pure culture. The development and escape of zoospores from spo¬ 
rangia take place very quickly under laboratory conditions, making the 
fungus a desirable one for ready observation of these phenomena. 
(8) The fungus is primarily a decay-producing rather than a leafspot- 
producing organism. It is capable of attacking the roots of many vegeta¬ 
bles other than rhubarb but has not been found on any other host under 
natural conditions. 
(9) The mycelium is intercellular though haustoria have been seen 
within the cells. 
(10) The organism is compared in detail with all previously described 
species of Phytophthora and is seen to be similar morphologically and 
physiologically to Phytophthora parasitica Dastur . It is therefore 
described as a variety of that species. 
(ti) Limited control experiments and general observations point out 
spraying with Bordeaux mixture as a practicable control measure. This 
should be combined with careful sanitary measures. 
LITERATURE CITED 
(1) Anonymous. 
1919. A DISEASE or PEARS NEW TO THE CONTINENT OP AMERICA. PHYTOPH¬ 
THORA cactorum. (Leb. et Cohn) Schroeter. In Agr. Gaz. Canada, 
v. 6, no. 11, p. 951-952, 1 fig. 
(2) Beach, W. S. 
1921. a phytophthora crown rot op rhubarb. (Abstract.) In Phyto¬ 
pathology, v. 11, no. 1, p. 55-56. 
(3) Butler, E. J. 
1907. AN ACCOUNT OP THE GENUS PYTHIUM AND SOME CHYTRIDIACEiE. In Mem. 
Dept. Agr. India Bot. Ser., v. 1, no. 5, 161 p., 10 pi. Literature, p. 
142-147. 
1919. report op the imperial mycologist. In Sci. Rpt. Agr. Research Inst., 
Pusa, 1918/19, p. 68-85. 
(5) -and Kuekarni, G. S. 
1913. COLOCASBE BBIGHT CAUSED BY PHYTOPHTHORA COEOCASLE RAC. In 
Mem. Dept. Agr. India Bot. Ser., v. 5, no. 5, p. 233-261, 4 pi. (1 col.) 
(6) Ceinton, G. P. 
1906. DOWNY MIEDEW, PHYTOPHTHORA PHASEOEI THAXT., OP EIMA BEANS. In 
29th Ann. ,Rpt. Conn. Agr. Exp. Sta. 1904/05, p. 278-303, fig. 8-9. 
Literature, p. 301-303. 
(7) — 
1908. ARTIPICIAE CULTURES OP PHYTOPHTHORA, WITH SPECIAL REFERENCE TO 
oospores. /^3ist/32nd Ann. Rpt. Conn. Agr. Exp. Sta., 1906/08, p. 
891-907, pi. 70-75. 
(8) Coleman, Leslie C. 
1910. DISEASES OP THE ARECA PALM (ARECA CATECHU E.) I. KOEEROGA OR ROT- 
disEasE. In Ann. Mycol., v. 8, no. 6, p. 591-626, 4 fig., pi. 7-9, 
(7 col.). 
1910. diseases op the areca paem. i. koeeroga. In Dept. Agr. Mysore 
[India] Bui. Mycol. ser., no. 2, 92 p., 6 fig., 18 pi. (4 fold., 1, 2 col.). 
(10) Dastur, Jehangir Fardunji. 
1913. on phytophthora parasitica nov. spec, a new disease of the 
castor oil plant. In Mem. Dept. Agr. India Bot. Ser., v. 5, no. 4, 
p. 177-231, 10 pi. (1 col.). 
(11) Godfrey, G. H., and Harvey, R. B. 
1921. motion pictures op zoospore production in phytophthora. In 
Phytopathology, v. n, no. 3, p. 145-146, pi. 6. 
