Seasonal Incidence and Management of Okra Mites, Tetranychus spp.
KrishiKosh
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Title |
Seasonal Incidence and Management of Okra Mites, Tetranychus spp.
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Creator |
Varadaraju.M.V.
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Contributor |
Nandihalli.B.S.
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Subject |
Agricultural Entomology
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Description |
In kharif crop, the okra mites, Tetranychus spp. reached peak during the first fortnight of November 2008 while in rabi crop, the peak was noticed during the second fortnight of March 2009. However, in summer, the peak was recorded during second fortnight of May 2009 at Main agricultural Research Station, Dharwad. Metarrhizium anisopliae @ 2.5x109 CFU/ml was significantly superior in controlling Tetranychus urticae Koch under laboratory condition. Under field condition, M. anisopliae @ 2.5x109 CFU /ml and V. lecanii @ 2.5x109 CFU /ml was superior in reducing the mite population and recorded higher yields of 13.73 and 12.71 tons per ha, respectively. The treated check i.e, dicofol recorded 14. 92 tons fruit yield per ha. NSKE (5%) was significantly superior to all other botanicals and possessed acaricidal and antifeedant properties under laboratory condition. Under field condition, NSKE (5%) was significantly superior in reducing tetranychid mite population and recorded highest fruit yield of 11.47 t/ha while the standard check, dicofol recorded 14. 11 tons per ha. The newer acaricide molecules viz., abamectin 1.9 EC (0.2 ml/l) and diafenthiuron 50 WP (2 g/l) were significantly superior in reducing tetranychid mite population. The higher fruit yield of 17.59 t/ha was recorded in abamectin 1.9 EC with highest cost benefit ratio of 1: 4.80. The next best treatments were diafenthiuron 50 WP (17.15 t/ha) and fenazaquin 10 EC (16.15 t/ha). The standard check i.e., dicofol recorded 14. 83 tons fruit yield per ha. |
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Date |
2016-11-10T13:35:27Z
2016-11-10T13:35:27Z 2010 |
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Type |
Thesis
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Identifier |
http://krishikosh.egranth.ac.in/handle/1/84843
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Format |
application/pdf
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Publisher |
UAS, Dharwad
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