Sensitivity of Phytophthora infesstans Isolateds to Fungicides Metalaxyl and Ethaboxam in Korea
Sensitivity of Phytophthora infestans isolates to fungicides metalaxyl and ethaboxam in Korea was examined with 260 isolates for 3 years (9 isolates in 2000, 93 isolates in 2001, and 158 isolates in 2002). Both A1 and A2 mating types were found from the isolates collected for 3 years. A1 mating type...
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Published in | The plant pathology journal Vol. 19; no. 3; pp. 143 - 147 |
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Main Authors | , , , , , |
Format | Journal Article |
Language | Korean |
Published |
한국식물병리학회
30.06.2003
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Subjects | |
Online Access | Get full text |
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Summary: | Sensitivity of Phytophthora infestans isolates to fungicides
metalaxyl and ethaboxam in Korea was examined with
260 isolates for 3 years (9 isolates in 2000, 93 isolates in
2001, and 158 isolates in 2002). Both A1 and A2 mating
types were found from the isolates collected for 3 years.
A1 mating type was dominant in the population with 8
isolates (88.9%) in 2000, 84 isolates (89.4%) in 2001,
and 138 isolates (87.3%) in 2002. Only some isolates
from diseased tomatoes in Buyergun and diseased
potatoes in Pyeongchanggun were of the A2 mating
type. As for metalaxyl sensitivity, 77.0% of the isolates
were moderately resistant with 8 isolates (88.9%) in
2000, 73 isolates (77.7%) in 2001, and 120 isolates
(75.9%) in 2002. Meanwhile, those found resistant were
1 isolate (11.1%) in 2000, 16 isolates (17.0%) in 2001,
and 33 isolates (20.9%) in 2002. Only 5 isolates (3.2%)
were sensitive to metalaxyl in 2002. There was no
significant difference in the sensitivity among years. As
for ethaboxam, no isolate was able to grow at 5.0 mg/ml,
and only four isolates (1.5%) grew at 1.0 mg/ml with
heavy retardation compared with the untreated control.
Based on these 3-year results, the minimum inhibitory
concentration (MIC) of ethaboxam to P. infestans was
determined to be 0.2-1.0 mg/ml. Results indicate that
resistance development by P. infestans to ethaboxam is
not likely to occur in the natural condition. Furthermore,
there was no indication of cross resistance between
metalaxyl and ethaboxam because all the isolates,
regardless of classification for their sensitivity to metalaxyl,
were not able to grow at 5.0 mg/ml of ethaboxam. KCI Citation Count: 1 |
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Bibliography: | G704-000528.2003.19.3.009 |
ISSN: | 1598-2254 2093-9280 |