CARNATION WILT DISEASES 19 



Table 10. Effect of Chemical Powders on Rooting of 



Olivette Carnation Cuttings. 



Basal section of cuttings dipped in powder, then planted in sand. 



Treatment 



Fermate 



Talc _._. 



(Dithane )HE-175 10%-Talc 90% .... 



Arasan 10%-Talc 90% 



Spergon 10%-Talc 90% 



Fermate 10%-Talc 90% 



No Treatment 



Table 11. Effect of Chemical Powders on Rooting of Olivette 



Carnation Cuttings and Control of Disease. 



Basal portion of cuttings immersed in spore suspension of Fusarium 



dianlhi, then dipped in fungicidal chemical powder before being 



planted in sand. 



Fermate 



(Dithane) HE- 175 10%-Talc 90%.. 



Arasan 10%-Talc 90%..... 



Spergon 10%-Talc 90%... 



Fermate 10%-Talc 90% ...., 



No Treatment 



No injurious effect on rooting was shown by Arasan or Fermate, and the 

 control of Fusarium wilt was striking. 



The value of adding these materials to hormone powder as a means of com- 

 bining both root-inducing action and disease control in the same treatment of the 

 cuttings before planting in sand is indicated. Study is required to determine 

 the effect of immersing carnation cuttings in a water bath of these chemicals on 

 the control of other carnation diseases and on rooting. 



Hormone Materials 



Kirby (36, 37) reported that dusts containing indolebutyric acid or naphthyl 

 acetamide were niore effective in disease prevention than a dust containing 

 naphthalene acetic acid, and that all of them and thiourea controlled Alternaria 

 better than potassium permanganate alone. It was implied that these chemicals 

 in talc are more fungicidal than thiourea in talc. The results were based on the 

 condition of Puritan cuttings as they were taken from the sand. 



The effect of these hormone materials on spore germination of the same Alter- 

 naria organism was studied by the writer. The spores from infected plant mate- 

 rial were applied to glass slides with a camel's-hair brush. Subsequently, the 

 slides were dusted with different brands of hormone powders or sprayed with 

 different brands of hormone solutions, corresponding to the concentration 



