|Cucumber Mosaic Virus||Leaves are small and distorted. Bright yellow line patterns form on the leaves.||Cucumber mosaic virus||Destroy affected plants. Propagate from plants free of the symptoms. Maintain good aphid control in the greenhouse.|
|Helminthosporium Leaf Spot||Small water-soaked leaf spots yellow and die. Spots merge and become large, irregular tan areas with a yellow halo.||Drechslera setariae (formerly Helminthosporium)||Avoid overhead watering. Apply a fungicide to protect plants.|
|Root Knot Nematode||Plants are stunted. Normally tuberous roots appear beaded and galled.||Meloidogyne||Discard infected plants. Or, take top cutting and discard the roots and soil. Plant in pasteurized mix.|
|Tip Burn||Leaf tips and margins turn brown and die. There may be a yellow between the dead and live tissue.||phosphate fertilizer or fluoride toxicity or high light intensity.||Water and fertilize moderately. Avoid using superphosphate and perlite since they contain excessive fluoride.|
|Yellowing||Young leaves are yellowed.||Lack of fertilizer, iron deficiency.||Maintain soil pH near 6. Use micronutrients or iron chelate to avoid iron deficiency.|
Prepared by Gary W. Moorman, Professor of Plant Pathology
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Issued in furtherance of Cooperative Extension work, Acts of Congress, May 8 and June 30, 1914, in cooperation with the U. S. Department of Penn State College of Agricultural Sciences research and extension programs are funded in part by Pennsylvania counties, the Commonwealth of Pennsylvania, and the U.S. Department of Agriculture.
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