Malvizz, sorry I haven't gotten back to you before now.* I've been in bed with a bad back.* :(* Of all the pesticides recommended, the ones that are environmentally friendly (and which I would use) are Bt aka "Bacillus thuringiensis var. kurstaki" aka Btk.* The other is "spinosad".*
Bt is a naturally occuring bacterium that targets the specific pest and is used in the US quite often for a pest called the Gypsy moth.* It's safe for you, your family, pets and the environment IF USED PROPERLY.* Here's more info about it.
Spinosad is also a naturally occuring bacterium but is a bit more powerful, effects the functioning of the nervous system and can harm some non-target beneficial insects as well as some fish.* The second site is a bit technical, but lists the product trade names in different countries in Table 5 near the bottom of the page.* Unfortunately it isn't listed in Italy and Malta isn't listed either.* The most recent date on this site is 2002, so maybe things have changed since then and other countries just aren't listed here.*
Here's some frightening info about malathion.
For treatment against eggs and newly hatched larva with "clorpirifos metil" I would not use this product as it's an organophosphate. Dimetoato, acefate and malathion are all organophosphates which effect the functioning of the nervous system but are synthetic and much more powerful.* You might want to read this before using.
I suspect "Piretroids" is pyrethroid.* This is the synthetic form of pyrethrin and can also do damage in the environment.
In all honesty, if this pest is such a problem, I would stop growing that particular plant.* I have done that with other problem plants in my garden.* After all, it sets up a cycle of pest and needed pesticide.* There is the potential of harm to humans, beneficial insects, pets and the environment.
I also found this when reading at the 'Malta Today' site.* I hope they get all the help they need.