Bioefficacy of horticultural mineral oil aganist the spider mite, tetranychus truncatus (Prostigmata: tetranychidae) on okra (Record no. 161813)
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| 000 -LEADER | |
|---|---|
| fixed length control field | 04015nam a22001697a 4500 |
| 082 ## - DEWEY DECIMAL CLASSIFICATION NUMBER | |
| Classification number | 632.6 |
| Item number | KAV/BI |
| 100 ## - MAIN ENTRY--PERSONAL NAME | |
| Personal name | Kavya Yadhav G A |
| 245 ## - TITLE STATEMENT | |
| Title | Bioefficacy of horticultural mineral oil aganist the spider mite, tetranychus truncatus (Prostigmata: tetranychidae) on okra |
| 260 ## - PUBLICATION, DISTRIBUTION, ETC. (IMPRINT) | |
| Place of publication, distribution, etc | Vellanikkara |
| Name of publisher, distributor, etc | Department of Agricultural Entomology, College of Horticulture |
| Date of publication, distribution, etc | 2018 |
| 300 ## - PHYSICAL DESCRIPTION | |
| Extent | 52p. |
| 502 ## - DISSERTATION NOTE | |
| Dissertation note | MSc |
| 520 3# - SUMMARY, ETC. | |
| Abstract | Spider mites of the family Tetranychidae are devastating pests of horticultural<br/>crops demanding suitable control measures. Synthetic acaricides, while effective, often<br/>cause resistance and resurgence, besides leaving residues on fruits and vegetables.<br/>Consequently, several natural products are being evaluated as safer alternatives for the<br/>management of mite pests. Petroleum derived mineral oils, for instance, have been used<br/>for centuries against insect and mite pests in several crops. However, phytotoxicity<br/>concerns have limited their use to a few selected crops. Recent advances in processing of<br/>mineral oils have mitigated these apprehensions, enabling their wider application in crop<br/>pest management, including vegetables.<br/>A study was undertaken at Department of Agricultural Entomology, College of<br/>Horticulture, Vellanikkara during 2017-18 in order to evaluate the bioefficacy of<br/>horticultural mineral oil (HMO) against the spider mite, Tetranychus truncatus. The<br/>study also aimed to test the phytotoxic effect of HMO on okra and its safety to important<br/>natural enemies such as the predatory mite, Neoseiulus longispinosus and the<br/>acaropathogenic fungus, Acremonium zeylanicum.<br/>Laboratory bioassays were conducted to evaluate the efficacy of HMO alone and<br/>in combination with neem oil against eggs and adults of T. truncatus. The results showed<br/>that HMO had appreciable ovicidal and adulticidal action against T. truncatus. Mineral<br/>oil alone, at concentrations of 1.5, 2.0, 2.5 and 3.0 per cent and combinations of HMO<br/>with neem oil viz., HMO 2.5 per cent + neem oil 2.0 per cent; HMO 3.0 per cent + neem<br/>oil 2.0 per cent and HMO 1.0 per cent + neem oil 1.0 per cent recorded 100 per cent<br/>mortality of eggs. In the case of adults, HMO at 3.0 per cent recorded the highest<br/>mortality of 92.00 per cent and was significantly superior to HMO at 2.5 per cent<br/>(84.00%) and neem oil 2.0 per cent (81.33%), which were on par with each other.<br/>In the field experiment, plots treated with HMO at 2.5 (92.60%) and 3.0 per cent<br/>(93.90%) as well as HMO 2.5 per cent + neem oil 2.0 per cent (94.14%) and HMO 3.0<br/>per cent + neem oil 2.0 per cent (96.79%) recorded significant reduction in mite<br/>population and were superior to plots treated with either spiromesifen (91.08%) or neem<br/>oil alone at 2.0 per cent (90.42%).<br/>The phytotoxic effect of HMO was tested on 45 day old potted okra plants by<br/>foliar application at concentrations of 2, 3, 4, 5 and 6 per cent. None of the concentrations<br/>showed phytotoxic symptoms on okra.<br/>Laboratory bioassay to evaluate the safety of HMO to the predatory mite,<br/>Neoseiulus longispinosus revealed that HMO is relatively safer to the predator than to<br/>T. truncatus. HMO at 3.0 per cent killed 38.89 per cent of eggs while HMO 3.0 per cent<br/>+ neem oil 2.0 per cent caused the highest mortality (27.78%) in adults.<br/>Combinations of HMO with neem oil were found to be more inhibitory to the<br/>acaropathogen, Acremonium zeylanicum than HMO alone. HMO 3.0 per cent + neem oil<br/>2.0 per cent recorded significantly higher inhibition of 86.44 per cent as against a<br/>significantly lower 46.67 per cent inhibition by HMO at 2.5 per cent.<br/>The high efficacy of HMO against the spider mite T. truncatus as well as its<br/>relative safety to the predominant natural enemy brought out in the study suggests that<br/>HMO can be an effective tool for mite management in vegetable crops.<br/> |
| 650 ## - SUBJECT ADDED ENTRY--TOPICAL TERM | |
| Topical term or geographic name as entry element | Agricultural Entomology |
| 700 ## - ADDED ENTRY--PERSONAL NAME | |
| Personal name | Haseena Bhaskar (Guide) |
| 856 ## - ELECTRONIC LOCATION AND ACCESS | |
| Uniform Resource Identifier | http://krishikosh.egranth.ac.in/handle/1/5810144232 |
| 942 ## - ADDED ENTRY ELEMENTS (KOHA) | |
| Source of classification or shelving scheme | Dewey Decimal Classification |
| Item type | Theses |
| Not for loan | Collection code | Home library | Current library | Shelving location | Date acquired | Full call number | Barcode | Date last seen | Koha item type |
|---|---|---|---|---|---|---|---|---|---|
| Not For Loan | Reference Book | KAU Central Library, Thrissur | KAU Central Library, Thrissur | Theses | 22/09/2018 | 632.6 KAV/BI | 174284 | 22/09/2018 | Theses |