Development of a chitin synthesis inhibitor resistance in the diamondback moth, Plutella xylostella (L.) (Lepidoptera: Yponomeutidae). 2. The result of susceptibility tests
The susceptibility of diamondback moth (DBM) collected from Mizobe, Kagoshima Prefecture to two chitin synthesis inhibitors was determined by the leaf-dipping method using 3rd instar larvae. Larvae were collected twice a year (Apr. and Nov.) during the period from 1989 to 1991. The DBM showed a high...
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Published in | Kyushu Plant Protection Research Vol. 38; pp. 129 - 131 |
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Main Authors | , , , |
Format | Journal Article |
Language | Japanese |
Published |
The Association for Plant Protection of Kyushu
1992
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Online Access | Get full text |
ISSN | 0385-6410 1884-0035 1884-0035 |
DOI | 10.4241/kyubyochu.38.129 |
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Summary: | The susceptibility of diamondback moth (DBM) collected from Mizobe, Kagoshima Prefecture to two chitin synthesis inhibitors was determined by the leaf-dipping method using 3rd instar larvae. Larvae were collected twice a year (Apr. and Nov.) during the period from 1989 to 1991. The DBM showed a high level of resistance against chlorfluazuron and teflubenzuron. The LCso values to chlorfluazuron increased from 11. 8 ppm in Nov. 1989 to 329 ppm in Nov. 1991. Teflubenzuron resistance first appeared in Apr. 1990 (LCso=23.9 ppm) ; the LCso value increased to 69. 4 ppm in Nov. 1991 despite the absence of spraying in the field, suggesting cross resistance between chlorfluazuron and teflubenzuron. The resistance level of both insecticides fluctuated seasonally: the resistance level was low in spring and high in autumn. |
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ISSN: | 0385-6410 1884-0035 1884-0035 |
DOI: | 10.4241/kyubyochu.38.129 |