More on Citrus

Juan Pablo Martinez-Soriano jpms at IRAPUATO.IRA.CINVESTAV.MX
Fri Apr 26 21:56:01 EST 1996


On 24 Apr 1996 04:55:03 -0700, D Jones said:

>        There is a slight difference between potatoes and Citrus fruits.
>As I see it, if I've understood your message correctly, you are only
>looking for the presence or absence of the virus.

Right, citrus botanical seeds are almost useless. Desirable varieties are
multiplied by grafting them on roostocks. Some strains of Citrus Tristeza
Virus induce a dramatic hypersensitive reaction right at the graft union
that eventually kills the tree (when the roostock is the sour orange).


>        I do believe however that as time goes on and the cost of PCR
>goes down, it will be possible to test individual samples, though I
>think that this is some way off yet.

Not really, time is now in many areas of diagnosis. Just ask the MDs and
the thousands of human patients. But yes I know, your point is on plants.
Well, we use it while testing for clean material, either it is been
exported or imported, in our plant health certification programs and so on.

Regards from Mexico

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Juan Pablo Martinez-Soriano               jpms at irapuato.ira.cinvestav.mx
CINVESTAV Unidad Irapuato
Apdo. postal 629                               Phone [01152] (462) 51600
Irapuato, Gto, MEXICO                            Fax [01152] (462) 45996
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                                                *thanks to Gerard R Lazo





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