Mefenoxam sensitivity and the impact of fumigation onPythiumspecies andPhytophthora cactorumin ginseng soils

Autor:	J. Miller, B. Capell, R. D. Reeleder, J. Schooley
Rok vydání:	2007
Předmět:	biology Phytophthora cactorum Pythium heterothallicum Pythium irregulare Fumigation food and beverages Plant Science biology.organism_classification complex mixtures Pythium ultimum chemistry.chemical_compound Agronomy chemistry Pythium Agronomy and Crop Science American ginseng Metalaxyl
Zdroj:	Canadian Journal of Plant Pathology. 29:427-436
ISSN:	1715-2992 0706-0661
DOI:	10.1080/07060660709507489
Popis:	Roots of American ginseng (Panax quinquefolius) are common ingredients in herbal medicines, and Pythium species are known to cause damping-off and root rot of ginseng seedlings. The impact of preplant fumigation and mefenoxam application on populations of Pythium species in ginseng soils was assessed. In soils where prefumigation populations were >375 colony forming units (CFU) per gram dry soil, fumigation significantly reduced populations by >70%. Populations in such fields did not recover to prefumigation levels during the 4 year period of ginseng cultivation. In fields where prefumigation populations were lower, reductions found after fumigation were either less marked or not significant. Fumigation to manage Pythium species may not be effective or required at all planting sites. Species composition varied among fields. Sensitivity to mefenoxam was higher among isolates of Pythium species collected from prefumigation soils than among those from soils from 4-year-old plantings. EC50 (concentration of m...
Databáze:	OpenAIRE
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