CARNATION WILT DISEASES 55 



disease was associated with the use of calcium arsenate, which was injurious by 

 itself; with copper-lime dust, where a serious infestation of red spider mite de- 

 veloped; and with no treatment. On October 28, one month after the last fungi- 

 cidal application, the final harvest of flowering stems of Matchless carnations was 

 made and checked for the total number of Alternaria infections. The addition 

 of calcium arsenate to lime sulfur or Bordeaux improved the control of blight 

 considerably. Except for injury associated with the use of combined lime sulfur 

 and calcium arsenate, the control of infection compared favorably with that 

 obtained with the Bordeaux-calcium arsenate combinations. 



In the summer of 1930, ten materials were compared on plots of 80 plants 

 each, as follows: 



Dust Materials — Parts by Weight 



Calcium Arsenate 20, Lime 80 



Monohydrated Copper Sulfate 30, Lime 70 



Calcium Arsenate 15, Monoiiydrated Copper Sulfate IS, Lime 70 



Naphthalene 20, Calcium Arsenate 20, Lime 60 



Naphthalene 20, Calcium Arsenate 15, Monohydrated Copper Sulfate 15, Lime 50 



Naphthalene 20, Sulfur 15, Monohydrated Copper Sulfate 15, Lime 50 



Spray Materials — In 50 Gallons of Water 



Hammond's Copper Solution 1 pint 



Fungtrogen 3 pints 

 *Copper Sulfate 2 lb., Sal Soda 3 lb.. Fish Oil H pint 

 ♦Copper Sulfate 2 lb., Caustic Soda 1 lb.. Fish Oil Vz pint 



Ten applications were made, the first on June 13 and the last on August 22, 

 The disease was observed generally among the plants in the week of June 9. 

 The first application seemed too late, and weather conditions were very favorable 

 for blight. Only Sal Soda Bordeaux and Caustic Soda Bordeaux (indicated by 

 an asterisk) gave satisfactory control of the disease. The results showed the 

 difficulty of controlling the disease in the field in seasons marked by moisture 

 conditions favorable to the fungus. 



In the season of 1931, fourteen treatments were compared on Matchless car- 

 nations, as follows: 



Dust Materials — Parts by Weight 



Calcium Arsenate 15, Monohydrated Copper Sulfate 15, Lime 70 

 Naphthalene 20, Calcium Arsenate 15, Monohydrated Copper Sulfate 15, Lime 50 

 Naphthalene 20, Sulfur 15, Monohydrated Copper Sulfate 15. Lime 50 

 Naphthalene 20, Calcium Arsenate 20, Lime 60 



Spray Materials — In 50 Gallons of Water 



♦Bordeaux 4-4-50, Calcium Arsenate 1 lb.. Fish Oil Yi pint 



♦Bordeaux 4-4-50, Calcium Arsenate 1 lb. 



♦Bordeaux 4-4-50, Fish Oil H pint 



♦Bordeaux 4-4-50 



' Bordow 8 lb.. Fish Oil Yt pint 



Bordow 8 lb. 



Lime Sulfur 1 gal., Fish Oil )/i pint 



Lime Sulfur 1 gal. 



Dry Lime Sulfur 4 lb.. Fish Oil H pint 



Dry Lime Sulfur 4 lb. 



^Dow Chemical Company; not more than 13 percent metallic copper. 



The Individual plots consisted of 90 plants arranged in 6 rows of 15 plants each. 

 Seven applications were made, the first on June 2 and the last on August 20. The 

 flowering stems were gathered as they blossomed from August 7 to September 

 20, and the number of infections was recorded at each harvest. Satisfactory 

 control of the disease was obtained only with Bordeaux mixture sprays. Sulfur 

 sprays and all of the dust mixtures gave poor control. Improvement in the 

 control of blight was shown by the addition of calcium arsenate and fish oil to 

 homemade Bordeaux mixture. 



