I think that if the veterinarian confirmed it as a case of poisoning, then that's what we have to go with. It's true that the symptoms can mimic heat poisoning, the flu, etc. But you have to trust a vet to know his/her job.
As far as Lannate is concerned, it
does have valid uses as Eliko mentions, from rye to corn to potatoes to pomegranates. The stuff is used all over the world. Stateside, Lannate is a restricted use pesticide - it can only be bought and sold by licensed applicators, and can only be applied under the supervision of a licensed applicator. But it
is used for its stated purposes. The label for Lannate is below. Deviating from the label in any way is a felony - be it wearing the wrong clothing, not providing adequate warning of application, using the wrong nozzle size/orientation, wrong ventilator, spraying when it's too windy out, using it for the wrong pests, getting caught applying without the label nearby, improper disposal, etc etc etc. It just needs to be better regulated in Cyprus. Pesticides are a fact of life on farms.
http://strawberry.ifas.ufl.edu/chemicalinfo/lannate.pdf
Either way, without Lannate, crop production would suffer, thus driving food prices upward and making certain foods and feeds unavailable to poorer people. Financial hardship would also befall farmers. I do not know of any organic alternatives that would be economically feasible. You have to make a judgment call as to whether you really want to cause pain to humans (and to animals whose feeds would be impacted) in the name of economic stewardship. In my opinion, that is not acceptable. Education and regulation are the answer - banning it will only hurt people.