Bright yellow line patterns form on the leaves Cucumber mosaic virus Destroy affected plants. Propagate from plants free of symptoms. Maintain good aphid control. Helminthosporium Leaf Spot Small water-soaked leafspots yellow and die.
Spots merge and become large, irregular tan areas with a yellow halo.
Avoid overhead watering. Apply chlorothalonil to protect healthy foliage. Root Knot Nematode Plants are stunted. Normally tuberous roots appear beaded and galled. Meloidogyne Discard infected plants.