2008•Socio-Environmental Systems ModelingOpen access
Baseline sensitivity of Phytophthora infestans lifecycle components to NC-224 20SC (Amisulbrom 200g/l)
M.G. Förch, G.J.T. Kessel, H.G. Spits, N. Hasunuma
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Abstract
Th e aim of this study was to determine EC 50 values of NC-224 20SC (active ingredient amisulbrom (ISO proposed), a new fungicide introduced by Nissan Chemicals Industries, Ltd.) for four stages in the life cycle of Phytophthora infestans.Th e four stages selected were the release of zoospores, motility of zoospores, germination of cystospores and the formation of oospores in planta.Th e EC 50 of NC-224 20 SC for zoospore release, motility of zoospores and germination of cystospores was found to be 0.016 ppm, 0.0002 ppm and 0.061 ppm.Oospore formation also responds sensitive to exposure to NC-224 20SC.Both, the total number of oospores and the number of viable oospores formed are reduced.Th e EC 50 value for the fraction of viable oospores formed was determined to be 35% of the recommended dose rate.
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