Effect of Fungicides on the Viability of Phylophthora cactorum Propagules m the Soil

Out of eleven fungicides, Ridomil, Aliette (systemic) and Euparen M were most effective in inactivating the fungus mycelium in the soil within 2 day. They also completely inhibited the production of sporangia and oospores. These fungicides and Antracol also reduced the viability (50–100%) of sporangia in the soil. They also reduced the viability of oospores along with Mancozeb, Zineb liquid Ziram. Euparen M, Antracol, Mancozeb, Zineb and liquid Ziram completely killed Zoospores; Ridomil, Previcur and Aliette were also effective. These fungicides can thus reduce the incoculum potential of the pathogen in the soil and reduce the chances of new infections.