6,711. Location. Two Rivers, WI. Mar 5, 2017. #3. Stress on the yeast, whether by temperature or underpitching or underaeration or sulfite additions or whatever, will cause off-flavors. Interestingly, in a hefeweizen, we actually WANT the "off-flavors", which are an excess of banana esters and clovy phenols. So we WANT to stress out the yeast ... More @Wikipedia
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