Final diagnosis


Pectobacterium carotovorum subsp. carotovorum (Bacterial soft rot)

Totally collapsed salad with several leaves withered. <b> <i> Pectobacterium carotovorum </i> subsp. <i>carotovorum</i> </b> ("bacterial soft rot")
The bacteria sometimes attack the main vein of lower leaves. Localized or extensive alterations are clearly visible. They are moist, brown to black in color. <b> <i> Pectobacterium carotovorum </i> subsp. <i>carotovorum</i> </b> ("bacterial soft rot")
A cross section made in the stem of this lettuce shows the start of invasion of the pith by a bacterium of the genus <b> <i> Pectobacterium </i> sp. </b>
In some situations, the rib can completely decompose as well as the surrounding leaf blade. <b> <i> Pectobacterium carotovorum </i> subsp. <i>carotovorum</i> </b> ("bacterial soft rot")
After cutting the stem transversely, a pinkish to brown coloration of the vessels can be noted. The bacteria then colonize the marrow, which becomes glassy and takes on a greenish tint. <b> <i> Pectobacterium carotovorum </i> subsp. <i>carotovorum</i> </b> ("bacterial soft rot")
Pectobacterium2
On this salad, the main veins of several low leaves show a more or less extensive rot. <b> <i> Pectobacterium carotovorum </i> subsp. <i>carotovorum</i> </b> ("bacterial soft rot")
Ultimately, the entire stem is affected; the rot is now spreading to the leaves of the apple. <b> <i> Pectobacterium carotovorum </i> subsp. <i>carotovorum</i> </b> ("bacterial soft rot")
<b> <i> Erwinia carotovora </i> subsp. <i>carotovora</i> </b> (<i> Pectobacterium carotovorum </i>, wet black rot of stem and apple, bacterial soft rot) on salad
The marrow and the vascular system gradually liquefy; fully rotten tissue shows a rather characteristic black coloration. <b> <i> Pectobacterium carotovorum </i> subsp. <i>carotovorum</i> </b> ("bacterial soft rot")