Problem of the Week

July 10, 1997: Bacterial Wilt on Pumpkins,(Erwinia tracheiphila),
plus Foliar Bacterial Diseases on Pumpkin Leaves

1. Because of an application failure of Furadan in our pumpkin plots, many plants were attacked by cucumber beetles, see last Problem of the Week. After about 3 weeks, we are already seeing some bacterial wilt in certain varieties. See the symptoms below. Growers who left squash, muskmelons or other vine crops unprotected from cucumber beetle attack, may already have bacterial wilt symptoms in their fields.

2. We are also seeing foliar bacterial diseases showing up on pumpkin leaves. While we are still getting the proper identification of these bacteria, we do have typical symptoms to show you. Stay tuned for proper identification.


Bacterial Wilt on Pumpkins

First symptoms appear as dull, green wilted areas on the leaf, (see red arrow).

A closer view of the leaf showing a dark, olive-green color between main leaf veins.
This area rapidly becomes necrotic, (turns dark brown), with some yellowing in some cases around the dead areas. Also, a distinct necrosis and chlorosis, (yellowing), develops around the leaf margins before the entire plant collapses and dies. Young pumpkin plants normally loose vigor, wilt and die about 2 weeks after the initial signs of infection.


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