Phosphonate applied as a pre-plant dip controls Ceratocystis paradoxa base rot of pineapple planting material

Abstract Base rot, caused by Ceratocystis paradoxa , can be a severe disease of pineapple planting material and result in poor establishment plants. Pre-plant dipping crowns potassium phosphonate is used to control Phytophthora cinnamomi root heart rot was tested for efficacy against base this study. Dipping 0.5% 2 min significantly reduced the severity on inoculated two trials with ‘MD2’ ‘73–50’. Fresh had more marked response than well-cured, dried crowns. In studies amended media, growth C. not inhibited concentrations up 100 ppm. Growth at higher but did completely inhibit even highest rate 6000 Potassium failed incidental Penicillium funiculosum infection basal crown tissue .