Comments on: Biocontrol offers benefits to Africa http://r4dreview.org/2011/11/biocontrol-offers-benefits-to-africa/ Fri, 18 May 2012 10:30:56 +0000 http://wordpress.org/?v=2.7 hourly 1 By: Rachid Hanna http://r4dreview.org/2011/11/biocontrol-offers-benefits-to-africa/comment-page-1/#comment-4052 Rachid Hanna Fri, 20 Apr 2012 12:09:34 +0000 http://r4dreview.org/?p=2720#comment-4052 Dr Jayaprakas We do not have direct information on the effects of T. aripo on the four species you have on cassava, but it can develop and reproduce - but poorly - on species (Tetranychus urticae and O. gossypii) closely related to those you have in your system. Please refer to the publication byGnanvossou et al on prey mite an life history of phytoseiids Exp Appl Acarol v30 pp 265-278. I will send you a pdf of this publication by e-mail. On the basis of results of the studies reported in Gnanvossou et al. 2003, I suspect that T. aripo will not do well on the tetranychid mites in your cassava system. It may be however good for you to introduce T. aripo and test it under your conditions. The added benefit of this is that this predator is excellent against cassava green mite, which you do not have in India, but could invade sometime in the future. Having T. aripo already in India may very well reduce the chances of invasion and establishment of cassava green mite in India. Hope this helps. Rachid Hanna Dr Jayaprakas
We do not have direct information on the effects of T. aripo on the four species you have on cassava, but it can develop and reproduce - but poorly - on species (Tetranychus urticae and O. gossypii) closely related to those you have in your system. Please refer to the publication byGnanvossou et al on prey mite an life history of phytoseiids Exp Appl Acarol v30 pp 265-278. I will send you a pdf of this publication by e-mail. On the basis of results of the studies reported in Gnanvossou et al. 2003, I suspect that T. aripo will not do well on the tetranychid mites in your cassava system. It may be however good for you to introduce T. aripo and test it under your conditions. The added benefit of this is that this predator is excellent against cassava green mite, which you do not have in India, but could invade sometime in the future. Having T. aripo already in India may very well reduce the chances of invasion and establishment of cassava green mite in India.
Hope this helps.
Rachid Hanna

]]> By: Dr. C.A. Jayaprakas http://r4dreview.org/2011/11/biocontrol-offers-benefits-to-africa/comment-page-1/#comment-4051 Dr. C.A. Jayaprakas Fri, 20 Apr 2012 11:25:24 +0000 http://r4dreview.org/?p=2720#comment-4051 I would like to introduce myself as Dr. C.A. Jayaprakas, Principal Scientist (Entomology) and Head, Division of Crop Protection, Central Tuber Crops Research Institute (CTCRI) (Indian Council of Agricultural Research) Thiruvananthapuram, Kerala, India. CTCRI is the only institute in India dedicated exclusively for research on tuber crops, particularly on cassava. I have been working on various aspects of the pests of cassava and other tuber crops for the last 23 years. It is interesting to note that <em>Typhlodromalus aripo</em> is an efficient predator of cassava green mite. In India the cassava is infested by four spp. of mites viz. <em>Tetranychus telarius</em> L., <em>T. neocaledonicus</em> Andre, <em>Eutetranychus orientalis</em> Klein, and <em>Oligonychus biharensis</em> (Hirst). Do you have any observation/ report on the predatory nature of <em>Typhlodromalus aripo</em> on the four species I mentioned above? Papaya mealy bug, <em>Paracoccus marginatus</em>, is the major problem in cassava and a number of other economically important crops here, but this has been managed well by a phytochemical formulation developed by me. I would like to introduce myself as Dr. C.A. Jayaprakas, Principal Scientist (Entomology) and Head, Division of Crop Protection, Central Tuber Crops Research Institute (CTCRI) (Indian Council of Agricultural Research) Thiruvananthapuram, Kerala, India. CTCRI is the only institute in India dedicated exclusively for research on tuber crops, particularly on cassava.

I have been working on various aspects of the pests of cassava and other tuber crops for the last 23 years. It is interesting to note that Typhlodromalus aripo is an efficient predator of cassava green mite. In India the cassava is infested by four spp. of mites viz. Tetranychus telarius L., T. neocaledonicus Andre, Eutetranychus orientalis Klein, and Oligonychus biharensis (Hirst).

Do you have any observation/ report on the predatory nature of Typhlodromalus aripo on the four species I mentioned above? Papaya mealy bug, Paracoccus marginatus, is the major problem in cassava and a number of other economically important crops here, but this has been managed well by a phytochemical formulation developed by me.

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