- Relating dietary diversity and food variety scores to vegetable production and socio-economic status of women in rural Tanzania. Dietary diversity was all too often alarmingly low, and when it was it was associated with seasonal fluctuations in the production and collecting of vegetables. But a more varied diet need not necessarily be healthier, so more procedural sophistication will be necessary in follow-up studies.
- A risk-minimizing argument for traditional crop varietal diversity use to reduce pest and disease damage in agricultural ecosystems of Uganda. For Musa and beans, more varietal diversity meant less damage and less variation in damage.
- Exploring farmers’ local knowledge and perceptions of soil fertility and management in the Ashanti Region of Ghana. Soils which farmers described as being more fertile were, ahem, more fertile.
- Population genetics of beneficial heritable symbionts. Of insects, that is. Important because they can confer protection from natural enemies, among other things. They behave a bit, but not entirely, like beneficial nuclear mutations.
- Widespread fitness alignment in the legume–rhizobium symbiosis. There are no cheaters.
- Genetic polymorphism in Lactuca aculeata populations and occurrence of natural putative hybrids between L. aculeata and L. serriola. Not much diversity in Israel, surprisingly. But isozymes?
- Meta-Analysis of Susceptibility of Woody Plants to Loss of Genetic Diversity through Habitat Fragmentation. The standard story — that trees suffer less genetic erosion because they are long-lived — is apparently wrong, even for wind pollinated trees.
- Large-scale cereal processing before domestication during the tenth millennium cal BC in northern Syria. “This was a community dedicated to the systematic production of food from wild cereals.”
- Nazareno Strampelli, the ‘Prophet’ of the green revolution. Before Norman, there was Nazareno.
- The memory remains: application of historical DNA for scaling biodiversity loss. Historical collections of salmon scales reveal many connections between modern evolutionary significant units (ESUs) in the Columbia River and old ones; but also, intriguingly, some differences.
Nibbles: Mopani, Svalbard, Chestnut blight, West African eats, Megareport, Fungi, Smallanthus, Innovation, MSB video, Pacific bananas
- No more mopani worms in Zimbabwe. Luigi distraught.
- More tosh on Svalbard. Nobody distraught.
- Chestnut blight threatens UK chestnuts. Castanophiles distraught.
- The oily charms of West African cuisine. Did someone say “oily”?
- Another big panel of the great and the good has issued a deafening report; Gordon Conway, panellist, tells us “How to create resilient agriculture“.
- DFID fertilises Vietnamese mushroom farms. Kept in the dark and fed manure?
- Yacon spotted in Malaysia. Just ask for snow lotus fruit.
- The World Bank has published a Sourcebook on Agricultural Innovation. So can we all go home now?
- Step inside the Millennium Seed Bank. A video.
- ProMusa disentangles Pacific bananas, the better to conserve them.
Nibbles: Cassava value addition, African food project, ITPGRFA, Filipino bananas, Plant Cuttings, Seed schools, Refugee gardens, Fisheries double, Cherry blossoms
- Projects I should probably know about but had never heard of, no. 37: Cassava: Adding Value for Africa (C:AVA).
- Projects I should probably know about but had never heard of, no. 38: African Food Tradition rEvisited by Research (AFTER). Mopane left unvisited, though, alas.
- More from the ITPGRFA Secretary Down Under.
- From genebank to farmers: bananas in the Philippines.
- Things are looking up: there’s a new Plant Cuttings out.
- We should all go back to seed school. Hey, just tell me where.
- Family gardens for refugees. And for urban folk in Ethiopia.
- Learning from the past in order not to repeat it, Vol. 88: Sustainble fisheries. Repeating it anyway, Vol. 565543 coming all too soon. No, wait, here it is…
- It’s that time of year again, isn’t it. Spring. Bah, humbug.
Brainfood: Cattle, Coffee pest management
- Modern Taurine Cattle descended from small number of Near-Eastern founders. Only 80 founding females, so it was difficult.
- Implementing an Integrated Pest Management Program for Coffee Berry Borer in a Specialty Coffee Plantation in Colombia. It wasn’t easy, and it took time, but it worked; less pesticides, more predators, higher quality beans.
Late blight is forever
Dave Allan, writing in The Herald, a Scottish paper, almost a month ago, sang the praises of some very blight-resistant potatoes called the Sarpo group. I picked up the story because these varieties were first bred 40 years ago in Hungary by crossing local Soviet varieties with wild relatives collected by Nikolay Vavilov in South America. I stuck it on the back boiler, meaning to write something up for St Patrick’s day last Saturday. 1
Meanwhile, there’s been a bit of a todo lately over field tests of GM potatoes in Ireland and England. According to The Sainsbury Laboratory’s FAQ, the potatoes have been engineered to increase their resistance to late blight, using genes from wild potato species. I think the same is true of the Irish trials, which is part of Amiga, an EU research project. 2
There’ve been all sorts of responses to this news, much of it utterly predictable. People thought it “ironic” that Ireland should question the need for blight-resistant potatoes, presumably in view of the famine of the 1840s. Others questioned the need for engineering blight resistance, given that there are some extremely resistant varieties.
But few people have questioned the basic premise: that engineered blight resistance will be more durable than that achieved by conventional breeding. I’m not sure there’s evidence for this either way. In any case, I wouldn’t expect it, a priori.
The point is quite simple: overcoming resistance is what pests and diseases do. They multiply like mad, and every new individual is a new lottery ticket. Sure, the odds of a jackpot are slim. But in every case I know of, the question is not if but when.
That was my response when NPR reported last week that, according to Monsanto scientists, “considering how hard it had been to create those crops, ‘the thinking was, it would be really difficult for weeds to become tolerant’ to Roundup”. Regardless of how easy a ride reporter Dan Charles gave Monsanto, this is just daft. Natural selection has the numbers and the time to overcome anything mere researchers can come up with.
Potatoes are susceptible to late blight, and get sprayed a lot. A new variant of the blight pathogen, known as ‘superblight’ or Blue 13, destroys even the most resistant of previously resistant varieties but not Sarpo varieties. Sarpo Mira has five different resistance genes; is that enough to protect it forever from anything late blight can throw at it? No.
The Sainsbury Lab says the main reason to engineer blight resistance is because breeding is difficult; easier to insert the genes into an already desirable variety. The Savari Research Trust says Sarpo varieties are very tasty. Both laboratories, and everyone else, regardless of whether they engineer blight resistance or select for it, will have to stay in the game for as long as blight is around. Forever.
Finally, shifting back to Ireland and the famine; just how many engineered varieties (if any) are going to be deployed? Leaving aside the historical, economic and colonialist explanations for the devastation wrought by late blight in 1845, the proximate cause was the prevalence of a single potato variety, Lumpers, that was susceptible.
The danger of too little diversity remains, regardless of the crop, regardless of the source of resistance.