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Dr Hans Herren, winner of this year's World Food Prize, talks about his pioneering work controlling the spread of cassava mealybug by introducing its natural predator wasp. Previously with IITA, Dr Herren is now Director General of the International Centre for Insect Physiology and Ecology (ICIPE) in Nairobi. Plus, news items about co-ordinating aid in Kenya, and growing legumes for fertiliser.