Penetration of metham and mylone into soil columns as measured by their effect on viability of microsclerotia of Verticillium dahliae
Co-Authors:
Ben-Yephet, Y., Division of Plant Pathology, Agricultural Research Organisation, The Volcani Center, Bet Dagan, Israel
Abstract:
The penetration of metham into loess or heavy soils was studied by measuring the viability of microsclerotia (MS) of V. dahliae placed at various depths in soil columns. Equal quantities of metham were applied in three ways; concentrated, dilute and combined application (i.e. concentrated and dilute application successively). Penetration was best in both soils when a combined application of the fungicide was used. In dilute application metham killed MS through the top 21 cm, wheres in concentrated application the fungicide killed MS placed between 26-38 cm. The combined application however, killed MS placed from 0-38 cm. It was found that using the combined application method, metham could kill MS in loess soil to a depth of 74 cm depending on depth of irrigation and amount of fungicide used. With mylone in granular form surface application was found to be better for MS control than incorporated or combined applications. Activities of metham and mylone against V. dahliae MS increased with the increase of incubation temperatures; the highest acitivities of the fungicides were observed at 35°C. Determinations of lethal curves of MS treated with metham or mylone showed that in both heavy and loess soils activity of metham against MS was higher than that of mylone in granular form. In heavy soil the amount of metham or mylone required to achieve ED 50 was about 25% more than in loess soil. © 1979 Martinus Nijhoff Publishers.
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Last updated date:
02/03/2022 17:27
Creation date:
17/04/2018 01:09
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