GRAINS-Corn slumps as ethanol makers feel coronavirus constraints <!-- no image --> <div>* Market awaits USDA plantings, quarterly stocks data (Recasts with U.S. market open, adds quote, updates prices, changes byline, changes dateline from PARIS/SINGAPORE)<div class="feedflare"> <a href="http://feeds.reuters.com/~ff/reuters/UKBankingFinancial?a=8MnZIXnywXA:q5Yo34siywQ:yIl2AUoC8zA"><img src="http://feeds.feedburner.com/~ff/reuters/UKBankingFinancial?d=yIl2AUoC8zA" border="0"></a> <a href="http://feeds.reuters.com/~ff/reuters/UKBankingFinancial?a=8MnZIXnywXA:q5Yo34siywQ:V_sGLiPBpWU"><img src="http://feeds.feedburner.com/~ff/reuters/UKBankingFinancial?i=8MnZIXnywXA:q5Yo34siywQ:V_sGLiPBpWU" border="0"></a> <a href="http://feeds.reuters.com/~ff/reuters/UKBankingFinancial?a=8MnZIXnywXA:q5Yo34siywQ:F7zBnMyn0Lo"><img src="http://feeds.feedburner.com/~ff/reuters/UKBankingFinancial?i=8MnZIXnywXA:q5Yo34siywQ:F7zBnMyn0Lo" border="0"></a> </div><img src="http://feeds.feedburner.com/~r/reuters/UKBankingFinancial/~4/8MnZIXnywXA" height="1" width="1" alt=""></div> Posted by Reuters