Abstract
Calcium chloride which is classified as generally recognised as safe (GRAS) under the Agricultural Compounds and Veterinary Medicines Regulations 2001 has potential for use in an organic apple production system against black spot (Venturia inaequalis) The effectiveness of calcium chloride on control of black spot was evaluated in a field trial over the 2007/2008 growing season Calcium chloride was applied 10 times over the season at the commerciallyrecommended rate of 033 kg product/100 litres or at 2 kg/100 litres (the latter treatment was halved after two applications due to foliar damage) At harvest fruit treated with the high rate of calcium chloride had a lower disease incidence of 41 than the water control which had 97 incidence (P
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