I prepared the past year a small research about presence of Blastophaga in Italy.

Said research was by me carried by interviews by phone in "significative" areals of Italy.

The calls was done in times of figs ripening, in regions where I was in doubt (extremes or remotes).
The question regarded the presence of filled seeds, inside ripe fruits.
The seeds (The small grains contained in the fruit), drop in bottom of a glass of water.
Those that float are empty.
If a fruit is fertilized, around one-two kilometers exists at least a Blastophaga colony
The inquiry was done by approx. 120 phone calls, and for so isn't not many complet and accurate.
You find herein a map, in violet colour the verified presence.
I'd like to know the areals of presence in the States, in South Africa, Australia, and Cina.
Allowable for clarifications.
Thanks for notices, and observations.
Bl.
 

Sergio, nice thorough work! It appears the wasp is in most of coastal Italy except the mountainous areas. 

Did you find if pollination is practiced on Italian fig farms as it is in Turkey & other smyrna fig producing countries?

Yes it is, of course, Mainly is in the south, where the fig cultivation is more economically important.
Many are naturally pollenized, (people are conscios that is pollenized, or not). The human-practice of caprification, with selected caprifig varieties, is only in few regions: Puglia, Calabria, Sicily.
(As is evident my rersearch do not separate "the way" of pollination). 
Also San Pietro types are frequent in the south.
The absence  of Blastophaga in the extreme North-West has to be controlled.
Also if Blastophaga is present, however I think that quite 95% of total cultivated trees in Italy are potentially parthenocarpic (common figs).
In fact the presence of fig trees is a lot frequent in home gardens for domestic use or limited trade, extensive cultivation is in said regions.
B.

Very interesting work. Thank You for posting.

Very interesting research and resulting map. If one were to allow for extending colored lines by geography, the results of such an exercise might imply that most of the coastal regions of Croatia would also host the wasp since most of coastal Croatia shares a climate very similar to the Italian coastline just across the Adriatic. Interestingly enough, according to the few citations for the availability of the wasp in Croatia that I have encountered, the only areas of confirmed wasp presence are on a select few islands just off the Dalmatian coastline around Dubrovnik.

Of course I think is surely also in Croatia and coastal Slovenia, Bosnia and Albania.
For my experience in fig trees is very important the cold winds exposure in winter. (Sunny and protected slopes are more important than altitude in mountains and hills).
My research was very simple and cheap, only 120 phone call, (In "meaningful" sites, not in a uniform tessellation ...). However the people in margins regions for fig do not preoccupe if there is pollenizing or not. Quite all cultivate partenocarpic thees.
But there can be cultivated Smyrna types too.
B. Z9b

Elegant.

Not surprised by absence of wasp from mountainous regions, as temperature drops with altitude and this is probably the limiting factor for the wasp.

Very cool research.

Thanks, and very simple.
Yes of course, but the condition is more uniform in the plains, where it is a lot more complex in hills and mountains, where the micro climate is important.
On hills and mountains the conditions are very different even at short distances for thermal inversion conditions, and for the location of hills, boulders, rocks and walls for cold winds, that produce small niches protected.
This is well noted by looking at where the snow stays, or where it stays less and goes away before.

Where figs are in wild conditions (in cold sites) the simple presence of fig trees indicates this. Just a few hundred yards away (wet, colder, and less sunny) there are no trees.
However, the tree (0°F, or lower) is more resistant than the insect (20°F).