{"id":18662,"date":"2019-06-20T12:12:05","date_gmt":"2019-06-20T16:12:05","guid":{"rendered":"https:\/\/extension.umaine.edu\/ipm\/?page_id=18662"},"modified":"2021-08-31T16:03:55","modified_gmt":"2021-08-31T20:03:55","slug":"5060e","status":"publish","type":"page","link":"https:\/\/extension.umaine.edu\/ipm\/ipddl\/publications\/5060e\/","title":{"rendered":"Edema"},"content":{"rendered":"

\n \n \"Print\n <\/a>\n <\/div><\/h3>\n

Pest Management Fact Sheet #5060<\/h3>\n

Developed byDeveloped by Alicyn Smart, Assistant Extension Professor & Extension Plant Pathologist, and Nathan Andrews<\/em><\/p>\n

For information about UMaine Extension programs and resources, visit extension.umaine.edu<\/a>.
\nFind more of our publications and books at extension.umaine.edu\/publications\/<\/a>.<\/strong><\/p>\n

Other Name:<\/strong> Oedema
\nPathogen:<\/strong> Abiotic Disease<\/h4>\n

Introduction<\/h3>\n

Edema\u00a0is a physiological disease that effects\u00a0leaves, stems, and fruit of plants.\u00a0 This disease occurs when the plant\u00a0takes up an excess\u00a0amount\u00a0of water,\u00a0causing cells to rupture.\u00a0Edema occurs when the soil moisture is wet and can be worsened by cold, wet weather and low air circulation.\u00a0During droughts followed by heavy rain, edema has been observed due to the fast uptake of water by plants.<\/p>\n

Host Plants<\/h3>\n
    \n
  • All vegetables and herbaceous plants<\/li>\n<\/ul>\n

    Symptoms and Signs<\/h3>\n

    Blisters will form on the underside of leaves that can vary in color from light green to yellow\u00a0and\u00a0beige (Fig. 1).\u00a0As these blisters age, they will eventually have the color and texture of cork (Fig. 2).\u00a0These blisters can also be seen from the top of the leaf as well.\u00a0 As the condition worsens, this can lead to leaves falling off and to\u00a0plants appearing spindly or \u201cleggy.\u201d Edema blisters can also appear on the stems and fruit of plants, leaving similar\u00a0corky blisters in these parts of the plant.<\/p>\n\n\t\t