CARNATION WILT DISEASES 53 



Table 18. Control of Alternaria Infection on Potted Jewel Carnations. 



Number Percent of Number of 

 Fungicide* of Infected Infections 



Leaves Leaves 



Calcium Arsenate 11^ Ib.-50 gal 35 45 22 



Same, plus Fish Oil J^ pt --. 35 17 11 



Bordeaux 4-4-50 .-...i 40 55 27 



Same, plus Fish Oil J^ pt.. _ 36 13 5 



Lime-Sulfur 1 gal. -40 gal 28 78 57 



Same, plus Fish Oil K pt -- - - 27 85 62 



Potassium Sulfide 2 gal. -50 gal .. 34 82 81 



Same, plus Fish Oil K pt 39 89 88 



Ammonia 3 pt., Copper Carbonate 6 oz.-50 gal 28 53 31 



Same, plus Fish Oil 1^ pt 31 51 34 



No treatment 38 79 101 



*Fish oil was added to improve wetting. 



Table 19. Control of Alternaria Infection on Potted Jewel Carnations. 



Number Percent of Number of 



Fungicide* of Infected Infections 



Leaves Leaves 



Calcium Arsenate 2 lb.-5C gal 28 7 3 



Same, plus Saponin 2/3 oz .._. 28 14 4 



Lead Arsenate 2 lb.-50 gal 32 81 61 



Same, plus Saponin 2/3 oz. 30 80 88 



Bordeaux 4-4-50 31 13 4 



Bordeaux, Calcium Arsenate 30 10 3 



Bordeaux, Lead Arsenate 28 10 3 



No Treatment.... 32 72 140 



♦Saponin was added to improve wetting. 



Dust mixtures of calcium arsenate, lime, sulfur, monohydrated copper sulfate, 

 and powdered naphthalene were compared for their efTect upon the control of 

 the disease. Carnation plants, Variety- No. 724, were dusted with the following 

 mixtures: 



Dust Materials — Parts by Weight 



Sulfur 



Monohydrated Copper Sulfate 20, Lime 80 

 Naphthalene 30, Lime 70 

 **Naphthalene 30, Calcium Arsenate 20, Sulfur 50 

 *Naphthalene 30. Calcium Arsenate 20, Monohydrated Copper Sulfate - Lime -SO 

 Naphthalene 30, Sulfur 20, Monohydrated Copper Sulfate - Lime 50 



The mixtures containing calcium arsenate (marked by asterisks) gave excellent 

 protection against infection, but the mixture indicated by the double asterisk 

 caused injury. The effective ingredient appears to be calcium arsenate, and the 

 importance of adding lime to dust mixtures containing calcium arsenate to avoid 

 injury is indicated by these results and other experience. The copper and sulfur 

 dusts used were not effective. 



The results from these exploratory studies on the value of chemical sprays and 

 dusts for controlling the disease on plants in damp chambers provided the basis 

 for further and greater effort in the field under natural conditions of inoculation. 



