382 OHIO EXPERIMENT STATION: BULLETIN 214 
Downy Mildew (Peronospora parasitica DeBy.), Leaf-Blight (Macrosporium 
Brassicae Berk.) and White Rust (Cystopus candidus (P.) Lev.), occur upon the 
mustard plants, including, perhaps, all named above and some others. As yet 
their presence has not proved a serious drawback. If to be treated, Bordeaux 
mixture should be applied. 
Wilt. The fusarium wilt disease earlier reported from the eastern truck 
districts, is now very destructive in Ohio. In 1909 it locally destroyed nearly all 
the crop where either infected plants were set upon fresh soil or plants were set 
on infected soil. It causes a yellowing and wilting of the plants sometimes 
with apparent stem injury. In our cabbage districts it may be this wilt is to 
contest with black-rot for first placein rank of injury done. The remedy lies in 
breeding wilt resistant strains of cabbage. 
CALLA 
A Root-Rot of callas has been studied by Halsted and Townsend. The 
disease appears to be due to bacteria (N. J. Rept. 1893). Reject rotted roots. 
CARNATION 
Bacteriosis of carnations has been reported upon by Arthur and Bolley (Ind. 
Exp. Sta. B. 59). This causes many small, brownish spots with yellowing of 
the leaves of the affected plants. Such are feeble in growth and deficient in 
return. The maintenance of best and most favorable growth conditions may 
often be effective in preventing this trouble; particularly sub-irrigation and war 
on aphides are to be recommended. 
Bud-Rot. A serious rot of carnation (Sporotrichum antrophilum Pk.) is 
reported from several states and is doubtless present in Ohio. 
Leaf and Calyx Mold (Hederosporium echinulatum (B.) Cke.) (Fairy Ring) of 
carnations is often very unsightly upon the calyces and pedicels of these flowers; 
it also attacks the leaves. All sorts appear to be more or less parasitized with 
the fungus in the houses where it prevails. Yet another spotting is produced 
by the carnation leaf-spot fungus (Sepfori Dianthi Desm.), which has appeared 
at this Station more frequently upon the Daybreak variety. It is believed that 
both these fungi will yield to treatment with Bordeaux mixture as per calendar. 
(See Bulletin 73). 
Carnation Rust (Uromyces caryophyllinns (Schrk.) Schroet.). This rust 
fungus is one of the serious diseases of the carnation. There is some differerence 
in the liabitity of varieties to the disease, and perhaps a much larger difference 
in the condition of the stock plants from which cuttings are made. Assuredly 
this matter of ‘‘cutting stock’’ is of very great im portance and one admitting of 
selection of the very best plants. Experiments conducted at this Station in 1896 
by the writer and the Station Florist (See B. 73) yielded no gain from spraying 
with Fowler’s solution, which has been sometimes recommended. Watchfulness 
in the destruction of rusted parts, and in the stock for propagation, are 
suggested for the control of rust. 
A Root- or Stem-Rot (Rhizoctonia and Fusarium) of éarnations has been 
noted by Stewart (Bot. Gaz. XXVII, 129, 130) and occasional rotting of the 
flowers through the presence of a Botrytis. For the former no thoroughly 
effective remedy is now at hand, while general cleanliness of the house is 
necessary to avoid the rot fungus Botrytis. (See Lettuce Rot). : 
CANNA 
Rust. Foliage of canna is sometimes attacked by arust which may be 
identified by the characters of its fungus (Uredo cannae). 
CANTALOUPE 
See Muskmelon. 
