CARNATION WILT DISEASES 57 



was used at 3 pounds to 50 gallons of water, and then reduced to 2 pounds in 50 

 gallons; but both were injurious and the treatment was discontinued. Yield 

 records of flowers from September to June, inclusive, showed a very favorable 

 response from field treatments with homemade Bordeaux 4-4-50 combined 

 with 1 pound of calcium arsenate (Table 22). There was no injury. The large 

 excess of lime in Bordeaux 4-4-50 or 5-5-50 exerts a buffering influence upon 

 calcium arsenate, and a deficiency of lime or an excess of calciuni arsenate in 

 the mixture can be seriously injurious to carnations. 



Table 21. Yield of Carnation Cut Flowers in the Greenhouse Following 



Spraying Treatments in the Field in the Summer of 1940. 



Variety, Nina Brener. Waltham. 



Yield, November to April 

 Fungicide * One Two Split Total 



per 

 Sq. Ft. 



Basic Copper Sulfate 2 lb.-50 gal 207 334 125 13.8 



Bordeaux 5-5-50, Calcium Arsenate 1 lb. 300 302 138 15.4 



Yellow Cuprocide H lb.-50 gal 209 328 163 14.5 



Cuprocide 54, 1 lb.-50 gal 235 294 171 14.5 



No Treatment 221 264 173 13.7 



Yield, November to May 

 Bordeaux 5-5-50, Calcium Arsenate 1 lb. 375 406 145 19.2 



Yellow Cuprocide % Ib.-50 gal 289 418 173 18.3 



No Treatment 297 348 180 17.1 



* Penetrol, J^ pint to 50 gallons, was used with each treatment. 



Table 22. Yield of Carnation Cut Flowers in the Greenhouse 



Following Spraying Treatments in the Field in the Summer of 1941. 



Variety, Nina Brener. Waltham, 



Yield, November to April 

 Fungicide * One Two -Split Total 



per 

 Sq. Ft. 



Dow Potato Spray** 710 307 169 24.7 



Yellow Cuprocide M lb.-50 gal 722 361 210 26.9 



Bordeaux 4-4-50..... 813 391 244 30.1 



Basic Copper Sulfate 2 lb. -50 gal 716 410 212 27.8 



Bordeaux 4-4-50, Calcium Arsenate 1 lb 855 395 227 30.7 



No Treatment 704 291 195 24.7 



* Penetrol, 3^ pint to SO gallons, was used with each treatment. 

 ** 3 pounds to 50 gallons for the first and second applications; then reduced to 2 pounds to 50 

 gallons. Both were injurious and the treatment was discontinued. 



Discussion and Recommendations 



S2rious occurrences of carnation blight are limited to susceptible varieties 

 and to seasons marked b}' frequent rainfall. In field culture, control of the disease 

 is possible only by protecting the plants with fungicides, but carnation growers 

 generally have been handicapped in controlling the disease in the field by lack 



