July
1997
, Volume
81
, Number
7
Pages
773
-
776
Authors
I. A. M.
Saeed
,
Assistant Researcher
, and
D. I.
Rouse
,
Professor, Department of Plant Pathology
;
J. M.
Harkin
,
Professor, Department of Soil Science
; and
K. P.
Smith
,
Research Associate, Department of Plant Pathology, University of Wisconsin, Madison 53706
Affiliations
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RelatedArticle
Accepted for publication 27 March 1997.
Abstract
ABSTRACT
Soil column studies were conducted to investigate the influence of soil water content and temperature on the efficacy of metham-sodium and its degradation product methyl isothiocyanate against Verticillium dahliae. The viability of the microsclerotia (MS) of the fungus in the top 30 cm of fumigated and control columns was measured. Temperatures for studies were 2 or 22°C, and the soil water content, expressed as soil matric potential, varied from -23 (wet), -113 (moist), to -2485 J/kg (dry). There was a significant interaction of soil water content and temperature on the efficacy of metham-sodium against V. dahliae MS. For the low soil temperature (2°C) the fumigant was more effective against MS of the fungus in wet than in moist or dry soil Soil water content did not affect fungicidal activity of metham-sodium when the soil columns were maintained at 22°C. These results suggest that the fumigant has a greater efficacy against V. dahliae in wet/cold soil conditions compared to the other conditions tested. Consequently, it was recommended that metham-sodium be applied to fields by chemigation in late fall or early spring to obtain efficacious results.
JnArticleKeywords
Additional keywords:
Busan 1020,
chemigation,
percent kill,
potato early dying,
soil fumigant
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ArticleCopyright
© 1997 The American Phytopathological Society