Rhizoctonia is a genus of asexual, anamorphic fungi known for causing crop diseases. It's also the word that netted 67-year-old Michael Petrina Jr. his second first-place win at the AARP National Spelling Bee. Petrina also won the bee in 2009 and placed second in 2011 and 2008.
He might have been No. 7 but luck had nothing to do with Tony Johnson capturing the 2011 AARP National Spelling Bee. Johnson, 58, a self-confessed "dictionary browser" knocked out two past champs to take home the $5,000 prize.
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