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Armyworm invasion threatening southern Africa’s crops

HARARE, Zimbabwe — An invasion of armyworms is stripping southern Africa of key food crops and could spread to other parts of the continent, experts warned Tuesday at an emergency meeting of 16 African nations.

South Africa, Zimbabwe, Malawi and Zambia are among the countries where the fall armyworm has invaded fields of maize, a staple crop throughout the region.

Malaria parasite may trigger human odour to lure mosquitoes

LONDON — Scientists may have figured out part of the reason why mosquitoes are drawn to people infected with malaria: odour.

Swedish researchers say they’ve identified a substance pumped out by malaria parasites that triggers that distinctive smell, noticeable only to mosquitoes. The study from Stockholm University was published Thursday by the journal Science.