what are PROS & CONS of these Rootstocks?

valencia orange
moroblood
singuinelli
pummelo

is there a web site that compare different rootstocks characteristics that are helpfull ?

The only one you have listed that is sometimes used as a rootstock is Pomelo.

I'm not sure of its compatibility with other scions, though... It's said to be the least compatible citrus rootstock overall.

Fourwinds growers uses Cuban Shaddock on most of their dwarf varieties, which is a pomelo hybrid.

sweet orange is used as a rootstock, the valencia, moro and sanguinelli would probably all be similar, if they are vigorous enough as seedlings.
Cuban shaddock is probably closer to lemon than true pummelo.

I don't know anyone in the US that uses any type of sweet orange as a rootstock.

Is this common in Australia ?

I looked up the 2010 Auscitrus report for certified seed sales, total 900kg, about 350kg troyer and carrizo, 310kg trifoliata 36kg rough lemon, 10 kg cleopatra mandarin, 3kgsweet orange, 2.2kg rangpur lime, plus other vars to make up the 900.
The seed count for sweet is about 2700 per litre, so 8 or 9 thousand seed total. That has probably dropped a lot from previous years??

Willits and Newcomb in USA listed Pineapple sweet orange as a rootstock seed var

I liked to share this link Which provided detailed differences betweeen rootstocks
CITRUS PROPAGATION AND ROOTSTOCKS

BY DR. MARTIN L. PRICE, EXECUTIVE DIRECTOR




http://www.ultimatecitrus.com/pdf/tncitrus.htm

Bodavid, are you propagating for in ground or containers?? Also you ask about "market fruit", what else is available? How about seedy orange like Shamouti, Joppa , Jaffa etc, or sour orange ?narenji? or Palestine sweet lime?

My understanding is sweet orange used to be used as a rootstock and is known to produce good quality fruit but is highly susceptible to phytopthora root and foot rot so it has fallen out of favor as a rootstock.

I have read that some people question whether Cuban shaddock actually has any pummelo in it even though it is called a shaddock. I don't know if any genetic analysis has ever been done on it. Some people think it is really a citron hybrid. I have had some Cuban shaddock rootstock suckers grow on some of my trees. The leaves are very large but the petioles are very short and completely wingless.

Lazz, that's a fair point. I was surprised the ammount of sweet orange now used was so low over here. I guess Bodavid may not be easily able to source other rootstock seed?

pagnr the only reason I bring this up, is from my experience sweet orange has a bad problem with foot rot. In a dry climate they may be fine, but here in the southeast US we get torrential rains in the summer & sweet orange has always gotten foot rot for me.