(Decanter) - Russian producers are calling on the government to avert a crisis as the worst winter weather in half a century has wiped out up to half this year's wine harvest.The federal government to take action, one producer said, with another warning, ‘Everybody was on the brink of a wipe-out.’ Temperatures dipped as low as as -30C in some areas, with Chateau Le Grand Vostock, based in Krasnodar’s Krymsk district, recording 15 days with an hourly average temperature of -15C – and three nights below -20C