Nov. 1, 1924 
Alternaria Leaf spot of Cauliflower 
441 
(7) Enzym studies showed that A. 
brassicae produced invertase and amy¬ 
lase but not pectinase or cytase, at least 
in demonstrable amounts, when grow¬ 
ing on sweet-potato and on cabbage 
decoctions. These decoctions were 
made less acid by the fungus. 
(8) A. brassicae attacks the leaves, 
stems of seedlings, heads, seed pods, 
and seeds of cauliflower. It has been 
isolated from seeds taken from within 
infected immature pods, showing that 
it can grow through the pod into the 
seeds. The fungus can be carried to 
the seed bed on the seeds, where it 
can cause damping-off of the young 
seedlings. Spores are produced abun¬ 
dantly on seedlings killed in this man¬ 
ner and these may serve as a source 
of further infection. The fungus can 
no doubt also live from one season to 
another in the soil. 
(9) Suggestions are made for con¬ 
trolling the disease. 
LITERATURE CITED 
(1) Berkeley, M. J. 
1836. fungi. 386 p. London. (Smith, J. E., 
English Flora, v. 5, pt. 2. Also forms, v. 2, 
pt. 2, of W. J. Hooker’s British flora.) 
(2) Busolt, E. 
1913. BEITRAGE ZUR KENNTNIS DER KOHLEN- 
HYDRATE DER GEMttSEARTEN. MITTEILUNG H. 
BEITRAGE ZUR KENNTNIS DER IM SAFT DER 
GRttNEN SCHNITTBOHNEN ENTHALTENEN KOH- 
lenhydrate. Jour. Landw. 61: 153-160. 
(3) Chupp, C. 
1923. DISEASES OF FIELD AND VEGETABLE CROPS 
IN THE UNITED STATES IN 1922. U. S. Dept. 
Agr. Bur. Plant Indus., Plant Disease Surv. 
Bui. Suppl. 26,163 p., illus. [Mimeographed.] 
(4) Clark, W. B. 
1918. VOLUMETRIC DETERMINATION OF REDUCING 
SUGARS. A SIMPLIFICATION OF SCALES’ METHOD 
FOR TITRATING THE REDUCED COPPER WITHOUT 
REMOVING IT FROM THE RESIDUAL COPPER 
solution. Jour. Amer. Chem. Soc. 40: 1759- 
1772, illus. 
(5) Dochnowski, R., and Tollens, B. 
1910. tlBER DIE BESTANDTEILE DES BLUMEN- 
kohls. Jour. Landw. 58: 27-31. 
(6) Edson, H. A., and Shapovalov, M. 
1920. TEMPERATURE RELATIONS OF CERTAIN 
POTATO-ROT AND WILT-PRODUCING FUNGI. 
Jour. Agr. Research 18: 511-524, illus. 
(7) Elliott, J. A. 
1917. TAXONOMIC CHARACTERS OF THE GENERA 
ALTERNARIA AND MACROSPORIUM. Amer. 
Jour Bot. 4: 439-476, illus. 
(8) Fawcett, H. S. 
1909. cabbage diseases. Fla. Agr. Exp. Sta. 
Ann. Rpt. 1909: 59-60. 
(9) Harter, L. L., and Jones, L. R. 
1918. cabbage diseases. U. S. Dept. Agr. 
Farmers’ Bui. 925, 30 p., illus. 
(10) -and Weimer, J. L. 
1921. STUDIES IN THE PHYSIOLOGY OF PARASITISM 
WITH SPECIAL REFERENCE TO THE SECRETION 
OF PECTINASE BY RHIZOPUS TRITICI. Jour. 
Agr. Research 21: 609-625. 
(11) Higgins, B. B. 
1917. NOTES ON SOME DISEASES OF COLLARDS. 
Ga. Agr. Exp. Sta. Ann. Rpt. (1916) 29: 
21-27, illus. 
(12) McKay, A. W., Fischer, G. L., and Nelson, 
A. E. 
1921. THE HANDLING AND TRANSPORTATION OF 
cantaloupes. U. S. Dept. Agr. Farmers’ Bui. 
1145, 23 p., illus. 
(13) PUTTEMANS, A. 
1912. NOUVELLES MALADIES DE PLANTES CUL- 
tivees. Bul. Soc. Roy. Bot. Belg. (1911) 
48: 235-247, illus. 
(14) Saccardo, P. A. 
1886. sylloge fungorum. v. 4. Patavii. 
(15) Scales, F. M. 
1915. A NEW METHOD OF PRECIPITATING CELLU¬ 
LOSE for cellulose agar. Centbl. Bakt. 
(II) 44: 661-663. 
(16) Sherbakoff, C. D. 
1917. SOME IMPORTANT DISEASES OF TRUCK 
CROPS IN FLORIDA. Fla. Agr. Exp. Sta. Bul. 
139, p. 192-277, illus. 
(17) Weimer, J. L., and Harter, L. L. 
1921. GLUCOSE AS A SOURCE OF CARBON FOR 
CERTAIN SWEET-POTATO STORAGE-ROT FUNGI. 
Jour. Agr. Research 21: 189-210. 
18)- 
1923. TEMPERATURE RELATIONS OF ELEVEN 
species of rhizopus. Jour. Agr. Research 24: 
1-40, illus. 
(19)- 
1923. HYDROGEN-ION CHANGES INDUCED BY 
SPECIES OF RHIZOPUS AND BY BOTRYTIS CINEREA- 
Jour. Agr. Research 25: 155-164. 
