The single palm tree we have in Culebrón has grown a couple of metres since we moved in. Our garden is a bit like a concentration camp for plants—it houses mainly the dead and the dying—but the palm tree seems relatively well. Of course, it's menaced, like all palm trees, by the picudo rojo, the palm weevil. The picudo lays eggs in palm trees, and the larvae bore into the palms, eventually killing them.
When the town hall first warned of this weevil they also offered programmes to remove infested trees (burning them can spread the weevil), they also recommended a person to check the health, or otherwise, of anyone's trees (I keep calling it a tree but I understand that palms aren't technically trees but some sort of grass-like plant). The bloke who came along, Javier, is still the man I ring up every 18 months or so to shimmy up the tree and hack off the excess branches. He said the palm was healthy and told me about Crispulo, who would spray the tree to keep it clear of the picudo. I used Crispulo a couple of times, but by then, my internet research suggested the chemicals and biological treatments that could be used to keep the palm healthy.
At the time, anyone could buy those chemicals and spray the palms, so I set myself up with long wands and spray packs because the treatment needed to be applied every six weeks. At first, the advice said there was no need to spray in the winter, but that changed soon after I started. As did the availability of the chemicals. At first, you could spray if you did a short course on how to spray safely. Then the amount of chemical you could buy at any one time was restricted, and finally, the chemicals were not exactly outlawed but limited to specialist use and users.
I've read lots about this weevil and how to keep it down. The internet, as always, provides whatever answer you want—people will sell you all sorts of things that they say will keep the tree safe. I've been very tempted a couple of times to go for one of the easier solutions but the two professionals, Javier the tree man and a bloke who looks after the palmeral attached to the palm museum in Elche, have both told me that the biological treatments are usable but nowhere near as effective as the old-style chemicals. Advice that I've read from regional governments and other reliable sources also basically opts for the chemicals, maybe with the biological treatments as useful for the cooler months. I was shocked when I checked the price of the biological controls - both the larvae eating worms and the fungus. Trouble is coming, though, because although we have only one tree and I only spray every six weeks, my stash of out-of-date chemicals is about to run out. I suppose after that I'll see if Crispulo is still in business. If not, maybe I just have to hope that the tree is now tall enough and that the picudo can't fly that high. Apparently, the stumpy Canary palms are much more liable to be infested than the tall Washingtonia palms and as ours is midway between - well, maybe.
