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Rose cuttings


I propagated roses commercially for the first time this year.  I did 
about 50 000 leaf bud cuttings primarily for Parkland and Explorer series 
roses.  I used a mist system that maintained RH at about 86% and temp at 
30-32 degrees C at midday.  Success was moderate to excellent for most 
varieties with the exception of Hansa and Therese Bugnet.  They turned 
brown after about 48-72 hours.  Not slimy, dark brown but a dry, crispy 
brown.  

Why did they do this so fast?  Any ideas?

BTW, I was using Sunshine Mix #1 with some extra Perlite and our 
irrigation water has slightly elevated levels of calcium.

Thanks in advance.

Dean Arndt in Manitoba
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