CABBAGE DISEASES-—-CABBAGE PESTS 
1905—Some bacterial diseases of plants 
prevalent in Michigan.—W. G. Sackett 
(Mich. Bul. 230, pp. 213-216, figs. 2). 
1909-—-Some bacterial diseases of plants. 
—W. G. Sackett (Colo. Bul. 138, pp. 15- 
18). 
Club Root 
Plasmodiophora brassicae Wor. 
1898—-Club root of cabbage and its al- 
lies.—B. D. Halsted (N. J. Bul. 98, p. 16, 
figs. 18). 
1893—Injurious insects and diseases of 
plants, with remedial measures.—W. B. 
Alwood (Va. Bul. 24, p. 12). 
1896—Prevention of cabbage club root. 
—F, C, Stewart (N. Y. State Rpt. 1895, 
pp. 525-529). 
1898—Susceptibility of varieties of tur- 
nips to club root; experiments with cab- 
bages, etc—B. D. Halsted (N. J. Rpt. 
1897, pp. 270-276, fig. 1). 
1898-—Club root and black rot.—L. R. 
Jones (Vt. Bul. 66, pp. 3-12, figs. 5). 
1907—Some important plant diseases of 
Washington——-W. H. Lawrence (Wash. 
Bul. 83, pp. 6-9, fig. 1). 
Root Rot or Stem Rot 
Corticium vagum B. & C. var. Solanit Burt. 
(Rhizoctonia) 
1899—Three important fungous dis- 
eases of the sugar beet—-B. M. Duggar 
(N. Y. Cornell Bul. 168, pp. 339-352, 361, 
pls. 3, figs. 5). 
1900—The rotting of greenhouse _let- 
tuce.—G. E. Stone and R. HE. Smith (Mass. 
Bul. 69, pp. 16, 17, 39, figs. 3). 
1901—The sterile fungus Rhizoctonia.— 
B. M. Duggar and F. C. Stewart (N. Y. 
Cornell Bul. 186, pp. 27, figs. 9). [Ibid., 
N. Y. State Bul. 186.] 
1904—Potato failures-——F. M. Rolfs 
(Colo. Bul. 91, pp. 33). 
1905——-Rhizoctonia (Rosette).—G. P. 
Clinton (Conn. Rpt. 1904, pp. 325-326, pl. 
1, figs. 3). 
Downy Mildew of Crucifers 
Peronospora parasitica (Pers.) DeBary 
1891—-Cabbage.—-B. D. Halsted (N. J. 
Rpt. 1890, p. 349). 
White “Rust” of Crucifers 
Oystopus candidas (Pers.) Lev. 
1901—The white mould of radish—B. 
D. Halsted (N. J. Rpt. 1900, pp. 462, 463, 
pl. 1). 
Bulletins covering generally the treat- 
ment of cabbage diseases: 
1904—Cabbage diseases and insects.—J. 
B. S. Norton and T. B. Symons (Md. Circ. 
Bul. 58, pp. 10, figs. 6). 
1909-—-The control of malnutrition dis- 
eases of truck crops.—L. L. Harter (Va. 
Truck Sta. Bul. 1, pp. 4-16, figs. 4). 
677 
1910—Diseases of garden crops and 
their control—N. J. Giddings (W. Va. 
Bul. 123, pp. 18, pls. 5). 
1910—A brief handbook of the diseases 
of cultivated plants in Ohio.—A. D. Selby 
(Ohio Bul. 214, pp. 307-456-+-vii, figs. 106). 
1911—California plant diseases.—R. E. 
Smith and E. H. Smith (Cal. Exp. Sta. 
Bul. 218). 
CABBAGE PESTS 
CABBAGE APHIS. See Aphids; also Cab- 
bage Louse, this section. 
Cabbage Cureulio 
Ceutorhynchus rapae, Gyle. 
Feeds upon the edge of the leaf. Not 
serious as yet and not in the Northwest 
so far as known. 
Cabbage Hair Worm 
Mermis albicans Deising 
Looks like a piece of basting thread. 
White in color, coiled or coiling and un- 
coiling or crawling on cabbage heads. 
From two to nine inches long. 
Hxaggerated reports of poisonings from 
the presence of this worm came from the 
South some years ago. 
The worm is entirely harmless. 
Reference 
Bu. Ento. Cire. No. 62, Revised. 
Cabbage Louse 
Aphis brassicae Linn, 
General Appearance 
Dark greenish yellow to brownish, with 
dark transverse bands across the abdo- 
mens of some individuals. All covered 
with a fine white powder, which gives 
them a silvery or frosted appearance. 
Life History 
The lice appear with the first plants in 
the spring and increase with such rapid- 
ity as to soon almost entirely cover the 
host. This condition prevails throughout 
the early summer, after which the para- 
sites begin to reduce their numbers. It 
is a disgusting pest on cabbage, cauli- 
flower and brussels sprouts. 
Food Plants 
All members of the Cruciferae includ- 
ing cabbage, cauliflower, brussels sprouts, 
mustard, radish, ete. 
