AI can diagnose plant disease

A woman in Lagos, Nigeria, peels cassava to make flour. Diseases and pests can threaten the crop. Photo: Sunday Alamba / AP

Researchers at Penn State University and the International Institute for Tropical Agriculture in Tanzania have trained a neural network running on a smartphone to spot cassava disease with 93% accuracy.

Why it matters: Diseases and pests threaten cassava, a root vegetable that is critical for food security in sub-Saharan Africa, and can lead to losses of over a $1.2 billion each year.