Journal article

Control of Phytophthora root rot of irrigated subterranean clover with potassium phosphonate in Victoria, Australia

FC GREENHALGH, RF de BOER, PR MERRIMAN, G HEPWORTH, PJ KEANE

Plant Pathology | Published : 1994

Abstract

Phosphonic acid was more effective in inhibiting the production of sporangia of Phytophthora clandestina in sterile pond water (ED50= 1·4 p.p.m.) than it was in inhibiting the growth of mycelium of the fungus on either corn meal agar (ED50= 13·8p.p.m.) or lima bean agar (ED50= 236 p.p.m.). Experiments under controlled environmental conditions showed that better control of tap root rot of subterranean clover caused by P. clandestina was achieved by application of potassium phosphonate to a pasteurized soil mixture than by a spray on the foliage alone. However, in a soil from a pasture, foliar sprays were more effective than soil treatments. Application of superphosphate at a rate of 250 kg/ha..

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