Annals of Plant Protection Sciences

  • Year: 2009
  • Volume: 17
  • Issue: 1

Effect of Manuring with Oilcake based Vermicompost on incidence of Red Spider Mite in Okra Crop

  • Author:
  • T.P. Mahto, R.P. Yadav
  • Total Page Count: 6
  • DOI:
  • Page Number: 40 to 45

Department of Entomology and Agril. Zoology, Tirhut College of Agriculture (R.A.U., Bihar), Dholi, Muzaffarpur, 843 121, India.

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Abstract

Among treatments, vermicompost from cow dung + neem cake (4:1 & 4.5:0.5 ratios) at 1.0 kg/pot recorded relatively low mite infestation throughout the crop stand. Extent of reduction in mite infestation due to manuring with vermicomposts varied widely from 8.3 to 27.1 to 39.8, 11.7 to 51.0, 4.7 to 26.8, 5.6 to 55.7, 15. to 43.0 and 12.1 to 84.8% zat 55, 62, 69, 76, 81, 88 and 95 DAS, respectively over unmanured control. It was maximum due to manuring with vermicomposts from cow dung + neem cake (4:1) at 1.0 kg/pot. Daily rate of population change (RPC) of red spider mite on okra plant in ascending phase between 55–62 DAS recorded the lowest and highest values of 0.18 and 0.74 in case of manuring with vermicompost from cow dung + neem cake (4:1) at 0.5 kg/pot and without manuring, respectively. In declining phase from 69 DAS onwards, it was at faster rate in case of manuring with vermicompost from cow dung + neem cake (4:1 or 4.5:0.5) at 1.0 kg or 0.5 kg/pot.

Keywords

Abelmoschus esculentus, Tetranychus urticae, Vermicompost