Tule boat ahoy

You may remember a post I did last summer on sedges called tules. Although not domesticated, tules have (or had) a lot of interesting uses among the Native Americans of California, including in the construction of boats. People still build tule boats, mainly for fun. I bring all this up because of a recent article on some fascinating new thinking about how people spread around the world. It seems that there is increasing evidence that they may have done so by boat, including perhaps during the initial peopling of the Americas from Asia. In which case they could well have gone from kelp bed to kelp bed in tule boats. Incidentally, the oldest boat in the world is a pine dugout made by the Bog People of NW Europe in about 8500 BC.

Army worms on the march

I think I may have blogged before about the ProMED-mail “global electronic reporting system for outbreaks of emerging infectious diseases & toxins.” You can get email alerts and also produce maps for plant diseases, such as this one:
map

Unfortunately, the system only covers infectious diseases. It is a programme of the International Society for Infectious Diseases, after all. Otherwise, it would have picked up the plague of armyworms currently affecting Liberia. A quick search of my feed reader revealed outbreaks in Namibia and Zimbabwe within the past two years. And Google Trends shows some interesting, ahem, trends in searching News archives show this timeline for news of this pest ((The search expression was: (armyworm OR “army worm”) AND outbreak.)) over the past few years:
trend1

There’s research on natural enemies going on, but that’s not going to help Liberia right now.