I have done plenty of research and lots of thinking on this topic of problems with fermentation of fruit other than grapes and here are my thoughts:
<UL>
<LI>manygrapes contain all the correct amount of compounds/nutrients to allow for a successful and complete fermentation even without adding yeast (this has been done for thousands of years)
<LI>fresh fruit, canned purees, and solid pack fruit do not have all these correct compounds/nutrients for a successful and complete fermentation (Oregon Fruit Purees are sterile
no heating or sulfite is needed)
<LI>heating the fruit or veggies to at least 150 degrees F will kill off the wild yeasts and bacteria so no sulfite should be needed when using recipelike this
<LI>adding sulfites also prevents wild yeasts and bacteriafrom taking over or ruining your controlled fermentation
<LI>using commercially prepared yeasts is done to control the final alcohol amount and also help bring out certain flavors in the wine
<LI>using too much sulfite will certainly inhibit the fermentation and remember not all yeasts are created equal...some are more tolerant of sulfite/nutrients and other compounds
<LI>I believe that the instructions provided with some of the solid pack fruit may be airing the on the high end of the sulfite level for the most protection against the nasties (75-100 ppm is plenty at the start and these levels should drop before the yeast is added)
<LI>As Joesph and others have pointed out, correct measurement and application of sulfites in any form is key to provide the protection and also not to cause problems with fermentation
<LI>treating your yeast properly and understanding how it works is also key knowledge for a wine maker
<LI>
I truly believe re hydrating your yeast properly and not just sprinkling it over the must is very important to a successful fermentation every time! I do not understand why some instructions say to do this and I am not saying it will not work but why not give your yeast the best chance of success!</LI>[/list]
found this article and wanted to share....as CW says read read read!
http://www.makewine.com/makewine/yeast1.html
Edited by: masta