Bioefficacy of the acaropathogen, acremonium zeylanicum (petch) gams and evans against the spider mite, tetranychus truncatus ehara (acari: tetranychidae) (Record no. 157887)
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| 000 -LEADER | |
|---|---|
| fixed length control field | 04337nam a22001697a 4500 |
| 082 ## - DEWEY DECIMAL CLASSIFICATION NUMBER | |
| Classification number | 632.6 |
| Item number | ALK/BI |
| 100 ## - MAIN ENTRY--PERSONAL NAME | |
| Personal name | Alka Sherief |
| 245 ## - TITLE STATEMENT | |
| Title | Bioefficacy of the acaropathogen, acremonium zeylanicum (petch) gams and evans against the spider mite, tetranychus truncatus ehara (acari: tetranychidae) |
| 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 | 2017 |
| 300 ## - PHYSICAL DESCRIPTION | |
| Extent | 65 |
| 502 ## - DISSERTATION NOTE | |
| Dissertation note | MSc |
| 520 3# - SUMMARY, ETC. | |
| Abstract | Spider mites (Prostigmata: Tetranychidae) cause severe injury to<br/>vegetables grown under both protected and open field conditions. Awareness on<br/>the ill effects associated with the use of synthetic chemicals in pest management<br/>has resulted in an increased demand for safe to eat food. Hence, ecofriendly<br/>strategies for the management of mite assume high priority. Investigations on<br/>potential natural enemies of spider mites by All India Network Project on<br/>Agricultural Acarology (AINPAA) have identified an acaropathogenic fungus,<br/>Acremonium zeylanicum (Petch) Gams and Evans from the spider mite,<br/>Tetranychus urticae Koch on brinjal from Thrissur district.<br/>The present study was undertaken at the Department of Agricultural<br/>Entomology, College of Horticulture, Vellanikkara during 2016 - 2017 in the<br/>above context to investigate the biocontrol potential of the acaropathogen, A.<br/>zeylanicum against the predominant species of spider mite in Kerala, Tetranychus<br/>truncatus Ehara; to assess the sensitivity of the acaropathogen to selected novel<br/>acaricides and botanicals and also to evaluate its safety to the predatory mite,<br/>Neoseiulus longispinosus (Evans).<br/>Laboratory bioassay conducted to evaluate the efficacy of A. zeylanicum at<br/>five different concentrations viz.1×105, 1×106, 1×107, 1×108 and 1×109 spores ml-1<br/>against T. truncatus recorded more than 50 per cent mortality of adult mites<br/>within six days at both 1×108 and 1×109 spores ml-1. The mortality increased with<br/>increase in concentration of the fungus and also with progress in time. The highest<br/>mortality of 68.36 per cent was recorded by A. zeylanicum applied at the rate of<br/>1×109 spores ml-1 seven days after treatment, which was on par with 61.65 per<br/>cent mortality recorded at 1×108 spores ml-1. The fungus was more effective<br/>against adult stage compared to egg stage of T. truncatus. The highest mortality of<br/>egg stage (41.33%) was recorded four days after the treatment at 1×10 9<br/>spores ml-1.<br/>Acremonium zeylanicum was evaluated along with two novel acaricides<br/>and two botanicals against T. truncatus on cucumber under polyhouse conditions.<br/>A. zeylanicum significantly reduced mite population seven days after treatment at<br/>both 1×108 spores ml-1 (72.71%) and 1×107 spores ml-1 (55.03%). However the<br/>novel acaricides (spiromesifen & diafenthiuron) and botanicals (neem oil &<br/>azadirachtin) were significantly superior to the acaropathogen in reducing the mite<br/>population.<br/>Compatibility study of A. zeylanicum with different agrochemicals<br/>revealed that the acaricides, spiromesifen and fenpyroximate were relatively safer<br/>to the fungus. The fungicides, Curzate M8 (Cymoxanil 8% + Mancozeb 64 %)<br/>and Equation Pro (Fomaxadone 16.6%+ Cymoxanil 22.1%) recorded highest per<br/>cent inhibition and were followed by the acaricides, fenazaquin, diafenthiuron,<br/>propargite and the botanicals azadirachtin and neem oil. Laboratory evaluation of<br/>safety of A. zeylanicum to the predatory mite N. longispinosus showed that the<br/>predatory mite was less susceptible to A. zeylanicum than the prey mite,<br/>T. truncatus. The pathogen did not have any ovicidal effect and had caused much<br/>lower mortality of 20 per cent on adults of N. longispinosus at the highest dose of<br/>1×108 spores ml-1.<br/>The study indicated the potential of A. zeylanicum in reducing mite<br/>population significantly both in laboratory and polyhouse. The pathogen was<br/>found to be compatible with commonly used acaricides and also was safe to the<br/>predominant predatory mite species in vegetable ecosystems. Thus it can be<br/>inferred that the acaropathogen A. zeylanicum could be a valuable component in<br/>integrated mite management programme in vegetables.<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/1/5810142989 |
| 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 | 12/12/2017 | 632.6 ALK/BI | 174121 | 12/12/2017 | Theses |