less than that in the corresponding untreated checks. As the corms from the un- 

 treated check of Spic and Span were lost, no comparison couldbe made in this variety. 



Because some growers had been treating cormels at 110 degrees F. for 24 

 hours, a connparison of the effectiveness of 110-degree and 135-degree treatments 

 was made, Cormels of four varieties were divided into three lots each. The first 

 lots were not treated, the second lots were treated at 135 degrees for 30 minutes on 

 March 15, and the third lots were treated at 110 degrees for 24 hours on May 9. 



Results of this test are shown in table 7. The hot -water treatments reduced 

 the yields of corms in all cases; the 135-degree treatment reduced the yields much 

 more than did the 110-degree treatment. In all varieties the percentage of rot was 

 less in corms fronn cormels treated at 135 degrees than in those treated at 110 de- 

 grees. The 110-degree treatment had little or no effect upon the disease. 



In 1958 an attempt was made to find out to what extent storage conditions be- 

 fore treatment affect cornnel dormancy and thus affect results obtained with the hot- 

 water treatment. Also, an attempt was made to find out if a chemical treatment would 

 be as satisfactory as the hot-water treatment. Cormels of nine varieties in a com- 

 mercial warehouse were divided into lots, the cormels of each variety into six lots. 

 Lots 1 and 2 of each variety were taken from the warehouse to the laboratory on Jan- 

 uary 7. Lot 1 was given the hot-water treatment, 135 degrees F. for 30 minutes, on 

 January 16. Lot 2 was kept in the laboratory at a temperature of 75 to 80 degrees F. 

 until February 12, when it was given the hot-water treatment. Lot 3 was taken from 

 the warehouse on February 11 and hot-water treated on February 13. After the 

 treated cormels were dried they were stored at 40 degrees F. until 1 week before 

 being planted. Lots 4, 5, and 6 were kept in the warehouse until May 8. On that 

 date lot 4 was soaked 2 1/3 hours in Emmi 1:400 at 50-54 degrees F. Lot 5 was 

 soaked 2 hours in Emmi 1:400 at 105 degrees F. Lot 6 was not treated. All cormels 

 were planted May 8. 



Results of this test are shown graphically in figs. 4, 5, and 6. In all nine va- 

 rieties fewer corms were obtained from lot 3 than from lot 2. In eight of the nine 

 varieties fewer cornns were obtained from lot 1 than from lot 2. Lot 2 was the only 



Table 7. --Effect of 135 and 110 degrees F. treatments on cormels, as indicated by number of corms 

 produced and per cent of corms rotted. 



Variety 



Treatment 



Date 



Corms 

 Produced 



Hans Van Meegrin 



Harry Hopkins 



Lady Jane 



Sans Souci 



896 

 146 

 800 



224 

 12 

 54 



858 

 102 

 556 



652 



84 



318 



I 



