Australian Broadcasting Corporation: The heatwave across south east Australia is worrying fruit and vegetable growers, with one table grape grower predicting a 70 per cent drop in yields. As the heat continues today across South Australia and Victoria, fire authorities say conditions are at their worst in the south east of the country since the Black Saturday fires just over a year ago. An expected top of 42 degrees in Adelaide will officially be a heatwave for the South Australian capital. Other capitals …