costs 1 euro. >> but you just need 20 bugs for one tree to remove the problem. >> reporter: how long does it take for the lady bugs to do their magic? >> the lady bugs, it takes around one year. >> reporter: multiply that by an estimated one million infected trees across italy... these trees are all infected. >> these trees are all infected, yes. >> reporter: and it's a battle that can only be won with chemical warfare, says this agronomist, out here injecting insecticide needed once every two years. >> the trees in one months, maximum two months, we can see restored. the new needles start to green up. >> reporter: just three months ago, these pines were on their death bed. now-- wow, so she's trees look much better. >> yes, absolutely. >> reporter: a small, yetat may be eternal, but with trees that are not.