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K. Ramaraju
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Integrated management of Eriophyid mite, Aceria guerreronis Keifer on coconut in Tamil Nadu, India K. Ramaraju
International Coconut Community Journal Vol 23 No 2 (2007): CORD
Publisher : International Coconut Community

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (259.036 KB) | DOI: 10.37833/cord.v23i2.167

Abstract

A field experiment was conducted at Vellalore from January 2002 to December 2004 to evaluate the influence of organic and inorganic nutrients and the effect of botanicals and insecticide against coconut eriophyid mite. Soil application of nutrients along with spraying of Triazophos 40 EC (5 ml/lit.), azadirachtin 1% (5 ml/lit.) and neem oil (30 ml/lit.) as first, second and third round of sprayings, respectively were evaluated. The results revealed that there was a significant reduction in mite population (65%) after two years in the Integrated Management (IM) treated trees (application of organic and inorganic nutrients, basin cultivation of sunnhemp and three rounds of spraying) followed by trees treated with Nitrogen: Phosphorus: Potash (1.3:2.0:3.5 kg/palm/year) + Farm Yard Manure 50 kg/palm/year + neem cake 5 kg /palm/year + micronutrients + three rounds of sprayings (52.8%). Similarly, there was also a significant reduction in the per cent damaged green nuts after two years. After second year, the per cent damaged nut was lowest (41.9) in the IM treated trees which was statistically on par with treatment 6 (42.9) as against control (71.8). A similar trend was also recorded after third year. IM package treated trees recorded the lowest nut damage grade of 2.8, 2.4 and 2.1 at harvest followed by IM package without sunnhemp as basin crop 3.0, 2.6 and 2.2 as against 4.3, 4.3 and 4.5 in the check after first, second and third year, respectively.
Integrated management of Eriophyid mite, Aceria guerreronis Keifer on coconut in Tamil Nadu, India K. Ramaraju; M. K. Varadarajan; E. V. Bhaskaran; J. Kavitha; P. Pretheep Kumar
International Coconut Community Journal Vol 23 No 2 (2007): CORD
Publisher : International Coconut Community

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37833/cord.v23i2.167

Abstract

A field experiment was conducted at Vellalore from January 2002 to December 2004 to evaluate the influence of organic and inorganic nutrients and the effect of botanicals and insecticide against coconut eriophyid mite. Soil application of nutrients along with spraying of Triazophos 40 EC (5 ml/lit.), azadirachtin 1% (5 ml/lit.) and neem oil (30 ml/lit.) as first, second and third round of sprayings, respectively were evaluated. The results revealed that there was a significant reduction in mite population (65%) after two years in the Integrated Management (IM) treated trees (application of organic and inorganic nutrients, basin cultivation of sunnhemp and three rounds of spraying) followed by trees treated with Nitrogen: Phosphorus: Potash (1.3:2.0:3.5 kg/palm/year) + Farm Yard Manure 50 kg/palm/year + neem cake 5 kg /palm/year + micronutrients + three rounds of sprayings (52.8%). Similarly, there was also a significant reduction in the per cent damaged green nuts after two years. After second year, the per cent damaged nut was lowest (41.9) in the IM treated trees which was statistically on par with treatment 6 (42.9) as against control (71.8). A similar trend was also recorded after third year. IM package treated trees recorded the lowest nut damage grade of 2.8, 2.4 and 2.1 at harvest followed by IM package without sunnhemp as basin crop 3.0, 2.6 and 2.2 as against 4.3, 4.3 and 4.5 in the check after first, second and third year, respectively.
Genetic diversity analysis of coconut eriophyid mite (Aceria guerreronis Keifer) (Acari: Eriophyidae) population based on inter simple sequence repeat (ISSR) markers J. Sathiya Prakash; K. Ramaraju; P. Meenakshisundaram; M. Maheswaran
International Coconut Community Journal Vol 23 No 1 (2007): CORD
Publisher : International Coconut Community

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37833/cord.v23i1.560

Abstract

DNA markers have been employed on several insect species to estimate the genetic diversity across their populations. In the present study, an attempt was made to survey the extent of diversity among the coconut eriophyid mite [Aceria guerreronis Keifer Eriophyidae: Acari] populations collected from various ecological zones of Tamil Nadu, India. A total of 13 samples of eriophyid mite were analyzed by using 5 inter simple sequence repeat (ISSR) primers. The number of scorable markers produced by an individual primer ranged from 3-20 with an average of 10.6 markers per primer. Out of 53 markers generated with 5 ISSR primers, 11 were polymorphic across the 13 mite samples with an overall polymorphism of 20.75%. The lowest and the highest level of polymorphism were observed with primers viz. ISSR02 (30.76%) and ISSR01 (100%), respectively. The data matrix obtained for the presence or absence of markers across the 13 mite populations was analyzed to estimate the genetic distance between each sample. The analysis indicated that the mite populations collected from different locations are almost similar, genetically.
Co-Authors E. V. Bhaskaran J. Kavitha J. Sathiya Prakash M. K. Varadarajan M. Maheswaran P. Meenakshisundaram P. Pretheep Kumar