A Locally Isolated Entomopathogenic Fungus to Control Tea Red Spider Mites (<i>Oligonychus coffeae<i> Acarina -Tetranychidae)
<p>Mites are considered as seasonal pests in tea. They cause significant damage to the crop during dry weather. However, the restrictions imposed by tea importers on pesticide residues in made tea pose an immediate need to identify alternative control methods for Propargite (a synthetic acaric...
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| Format: | Article |
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Postgraduate Institute of Agriculture, University of Peradeniya
2011-11-01
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| Series: | Tropical Agricultural Research |
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| Online Access: | https://tar.sljol.info/articles/3789 |
| _version_ | 1818179095930863616 |
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| author | PGDS Amarasena KM Mohotti D Ahangama |
| author_facet | PGDS Amarasena KM Mohotti D Ahangama |
| author_sort | PGDS Amarasena |
| collection | DOAJ |
| description | <p>Mites are considered as seasonal pests in tea. They cause significant damage to the crop during dry weather. However, the restrictions imposed by tea importers on pesticide residues in made tea pose an immediate need to identify alternative control methods for Propargite (a synthetic acaricide) and sulphur which are the current recommendations. The alternative methods should be effective, biological, safe and acceptable to the importers. Previous attempts have been made to screen predatory mites and entomopathogenic fungi against tea mites; however, local sources have not yet been investigated. The present study was conducted to explore the possibilities in biological control methods with specific objectives of isolating and preliminary screening of local entomopathogenic fungi against tea mites under laboratory conditions. In this study, naturally occurring fungal species from six different tea ecosystems reducing populations of tea red spider mites (<em>Oligonychus coffeae</em>) were isolated. The laboratory experiments conducted on mite-infested excised-leaves confirmed that the unidentified fungus coded as HF1 was significantly (p<0.05) effective in reducing mite populations. The Fungal isolate gave 65% mortality while the highest mortality of 75% was achieved by the TRI recommended acaricide, Propargite. Comparatively, <em>H. thompsonii</em> and neem seed extract exhibited lower mortality. This is the first record of isolation of entomopathogenic fungi from tea mites in Sri Lanka. The preliminary results foresee the potential of harnessing local entomopathogenic fungi in managing tea mites as an environmentally safe and effective treatment.</p><p><strong>Key words: </strong>Entomopathogenic fungi; Hirsutella thompsonii; Red spider mites</p><p>DOI: http://dx.doi.org/10.4038/tar.v22i4.3789</p><p><em>TAR </em>2011; 22(4): 384-391</p> |
| first_indexed | 2024-12-11T20:58:26Z |
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| language | English |
| last_indexed | 2024-12-11T20:58:26Z |
| publishDate | 2011-11-01 |
| publisher | Postgraduate Institute of Agriculture, University of Peradeniya |
| record_format | Article |
| series | Tropical Agricultural Research |
| spelling | doaj.art-64d40e644f144d3c90640b457d0281d22022-12-22T00:51:03ZengPostgraduate Institute of Agriculture, University of PeradeniyaTropical Agricultural Research1016-14222011-11-0122438439110.4038/tar.v22i4.37893147A Locally Isolated Entomopathogenic Fungus to Control Tea Red Spider Mites (<i>Oligonychus coffeae<i> Acarina -Tetranychidae)PGDS Amarasena0KM Mohotti1D Ahangama2Postgraduate Institute of Agriculture, University of Peradeniya, PeradeniyaEntomology and Nematology Division, Tea Research Institute of Sri Lanka, TalawakeleDepartment of Agricultural Biology, Faculty of Agriculture, University of Peradeniya, Peradeniya<p>Mites are considered as seasonal pests in tea. They cause significant damage to the crop during dry weather. However, the restrictions imposed by tea importers on pesticide residues in made tea pose an immediate need to identify alternative control methods for Propargite (a synthetic acaricide) and sulphur which are the current recommendations. The alternative methods should be effective, biological, safe and acceptable to the importers. Previous attempts have been made to screen predatory mites and entomopathogenic fungi against tea mites; however, local sources have not yet been investigated. The present study was conducted to explore the possibilities in biological control methods with specific objectives of isolating and preliminary screening of local entomopathogenic fungi against tea mites under laboratory conditions. In this study, naturally occurring fungal species from six different tea ecosystems reducing populations of tea red spider mites (<em>Oligonychus coffeae</em>) were isolated. The laboratory experiments conducted on mite-infested excised-leaves confirmed that the unidentified fungus coded as HF1 was significantly (p<0.05) effective in reducing mite populations. The Fungal isolate gave 65% mortality while the highest mortality of 75% was achieved by the TRI recommended acaricide, Propargite. Comparatively, <em>H. thompsonii</em> and neem seed extract exhibited lower mortality. This is the first record of isolation of entomopathogenic fungi from tea mites in Sri Lanka. The preliminary results foresee the potential of harnessing local entomopathogenic fungi in managing tea mites as an environmentally safe and effective treatment.</p><p><strong>Key words: </strong>Entomopathogenic fungi; Hirsutella thompsonii; Red spider mites</p><p>DOI: http://dx.doi.org/10.4038/tar.v22i4.3789</p><p><em>TAR </em>2011; 22(4): 384-391</p>https://tar.sljol.info/articles/3789entomopathogenic fungihirsutella thompsoniired spider mites |
| spellingShingle | PGDS Amarasena KM Mohotti D Ahangama A Locally Isolated Entomopathogenic Fungus to Control Tea Red Spider Mites (<i>Oligonychus coffeae<i> Acarina -Tetranychidae) Tropical Agricultural Research entomopathogenic fungi hirsutella thompsonii red spider mites |
| title | A Locally Isolated Entomopathogenic Fungus to Control Tea Red Spider Mites (<i>Oligonychus coffeae<i> Acarina -Tetranychidae) |
| title_full | A Locally Isolated Entomopathogenic Fungus to Control Tea Red Spider Mites (<i>Oligonychus coffeae<i> Acarina -Tetranychidae) |
| title_fullStr | A Locally Isolated Entomopathogenic Fungus to Control Tea Red Spider Mites (<i>Oligonychus coffeae<i> Acarina -Tetranychidae) |
| title_full_unstemmed | A Locally Isolated Entomopathogenic Fungus to Control Tea Red Spider Mites (<i>Oligonychus coffeae<i> Acarina -Tetranychidae) |
| title_short | A Locally Isolated Entomopathogenic Fungus to Control Tea Red Spider Mites (<i>Oligonychus coffeae<i> Acarina -Tetranychidae) |
| title_sort | locally isolated entomopathogenic fungus to control tea red spider mites i oligonychus coffeae i acarina tetranychidae |
| topic | entomopathogenic fungi hirsutella thompsonii red spider mites |
| url | https://tar.sljol.info/articles/3789 |
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