Figure 1.

(A) East African smallholder maize crop devastated by maize lethal necrosis disease (all maize plants killed or dying); potato understory crop unaffected. (B) Maize plant dying from maize lethal necrosis disease (center), surrounding maize plants healthy, image modified from [9]. (C) Wheat crop containing yellow dwarf diseased plants showing flag leaf symptoms of reddening and chlorosis. (D) Rows of wheat plants showing severe yellow dwarf disease symptoms of leaf chlorosis and reddening and plant stunting. (E) Wheat crop devastated by wheat streak mosaic disease showing plants with severe leaf chlorosis, deformation and necrosis, and overall plant stunting. (F) Close up of wheat plant showing wheat streak mosaic disease leaf symptoms of chlorotic yellowing and green streaking.