WebEcoist has a nice series of slideshows on “70 Extremely Exotic Plants, Flowers, Forests & Trees.” Kinda silly, I know, but I’m a sucker for photos of weird plants, I guess. Anyway, the one on “Deliciously Exotic Plants, Fruits and Vegetables” puzzled me for a minute because the picture labelled “pawpaw” is certainly no Carica papaya. In my ignorance, I thought the term pawpaw was only ever used as a synonym for papaya. Well, it turns out the fruit in the picture is also called Hoosier banana, and is in fact Asimina triloba. Related to the cherimoya (Annona cherimola), “[t]he pawpaw is native to the temperate woodlands of the eastern U.S. The American Indian is credited with spreading the pawpaw across the eastern U.S. to eastern Kansas and Texas, and from the Great Lakes almost to the Gulf.” There’s a festival devoted to the fruit in Ohio in September. Interestingly, if you search Wikipedia for pawpaw, it sends you straight to Asimina. A Google search also returns mainly Asimina stuff, but if you search images you get a mixture of Carica and Asimina. The dangers of using common names.
Nibbles: Danone, Street food, Makutano Junction, Canberra, Africa, Markets, Veggies
- Let them eat yoghurt. Danone targets the poor. h/t Tom
- Eating Mexico City, one street at a time. Bookmarked.
- It’s The Archers, Jim, but not as we know it. Soaps spread (agro)innovation.
- The Crawford Fund Conference does biodiversity (in Australia)
- New Agriculturist reports on a discussion of development in Africa. Is anybody listening?
- Food markets freed! A little. In one US state.
- Local leafy greens all the rage in Kenya. Yeah, yeah. No but seriously, one of the great changes in the past 10 years, and a major agrobiodiversity success story.
The horse in Mongolian culture
They may be trying to develop and diversify their agriculture now (well, since the 1950s), but Mongolians are traditionally very much a nomadic herding culture, with the horse at its centre. 1 One expression of that is how early kids learn to ride.
Most young Mongolians — boys in particular — learn to ride from a very young age. They will then help their fathers with the herding of goats, sheep and horses. Some children have a chance to ride at festivals called Naadam — the biggest of which is held on 11th-13th July in Ulaanbaatar — though there are naadams held throughout the year all over the countryside. Young jockeys between the age of 5 and 12 (girls and boys) race horses over distances ranging from 15km to 30km. There are 6 categories for the races depending on the horses’ age, including a category for 1 year old horses (daag) and one for stallions (azarag).
Alas, this museum display is as close as I got to seeing the famous Mongolian Wild Horse or Przewalski’s Horse (Equus ferus przewalskii), locally known as takhi.
It’s possibly the “closest living wild relative of the domesticated horse, Equus caballus.” Certainly it is genetically very close to the local domesticated breed based on molecular markers, though that could be because of interbreeding. Last seen in the wild in 1969, its restoration in China and Mongolia from captive stock, for example to the Hustain Nuruu National Conservation Park, is one of the great conservation success stories.
A sweet potato Christmas tree in Beijing
Maybe someone out there can help me out with this. I was walking along a main thoroughfare towards the Bird’s Nest Stadium in Beijing and came across on the grass verge a construction consisting of tubs of what I believe may be sweet potato plants craftily arranged on a metal framework in the general shape of a Christmas tree. Here it is below (click on it to enlarge).
Can somebody explain the point? Is this vegetative cone merely decorative, or do the plants have symbolic value? Are they in fact sweet potatoes?
Detoxifying cassava
Strategies that minimize one risk…may augment another risk… Peasant farmers are perfectly conversant with such linkages. The neglect of peasant agriculture by both donors and governments is among the deeper causes of current crises, along with the increasing inequality that deprives them of secure tenure to land and other resources, reducing benefits they can expect to receive from stewardship of these resources.
That comes towards the end of a lengthy, information-dense and closely argued paper on cassava’s domestication, evolution and chemical ecology by Doyle MacKey and others. 2 Coincidentally — or perhaps not — McKey also has a paper out just now on the evolutionary ecology of vegetatively propagated crops in general. 3 But that’s something for a future post, perhaps. Back to cassava.
Well, as I say, there’s a lot of stuff in the paper, but let me focus on a just a couple of things here. Some cassava varieties are high in poisonous cyanogens, requiring laborious and time-consuming processing for detoxification, which is almost exclusively done by women and, according to at least one anthropologist, serves to control them, “by limiting their freedom of action, in male-dominated societies.” So let’s replace those high-cyanogen, “bitter” varieties with low-cyanogen, “sweet” varieties, right?
Well, not so fast. ‘‘Interestingly enough, the women that are the custodians of this crop do not perceive the processing or the toxin to be a problem.’’ Bitter manioc is in fact better for food security for at least three reasons: it is protected against pests; immediate processing deters thieving; and the value added through processing reduces the social obligation to share. Overall, therefore, “processing bitter manioc is viewed as a useful and valorizing activity.”
But there are regular epidemics still in some parts of Africa of the paralytic disease konzo, which is “associated with several weeks of almost exclusive consumption of insufficiently processed bitter cassava.” Surely low-cyanogen varieties would be welcome there?
Again, the authors are dubious. They point out that agronomic practices, in particular careful nutrient management, together with adequate processing and a reasonably protein-rich diet are perfectly sufficient to manage the toxicity problem, and in fact normally do so. It is mainly when socioeconomic stability breaks down that konzo erupts. As they trenchantly put it: “This crop needs peace.” And reasonable rainfall. Drought stress tends to increase cyanogen levels. Plus, “[a]s they face food shortage, people may then take short cuts in processing bitter manioc.” In both cases, new, faster, more efficient detoxification methods will have a bigger impact than sweet varieties, with their greater susceptibility to pests.
In general, cassava is expected to be comparatively little affected by climate change, and is being promoted in some quarters as a “food for the future.” Fair enough, say the authors, but this
…will need to be accompanied by the necessary education for processing, as planting less bitter cultivars appears not to be a solution. Farmers have good reasons for preferring bitter varieties.
Indeed they do. So let me end with another heady quote, again from the concluding section of the paper, a little further on from the quote I started with.
We must have the humility and the broad vision to accept that our science can provide essential pieces, but only pieces, of viable solutions. ‘‘Modern’’ science can work in creative ways with folk knowledge. But no technological fix is a ‘‘magic bullet’’.