Image Number K7555-1

Plant pathologist Gail Wisler examines dot blots of nonradioactive probes that help identify both tomato infectious chlorosis and cucurbit yellow stunting disorder that are spread by whiteflies. Discolored tomato leaves in right foreground and small, yellowed cucumber leaves are symptoms of the viral diseases.

Photo by Jack Dykinga.

640 pixels wide: (k7555-1.jpg)