Bacteria enter their host through wounds or small openings. They can easily be spread from one plant top another. Rots attack because of bacterial enzymes that dissolve cell walls. In wilting the bacteria have blocked the vascular systems that transport water and sugar to the plant. These include black rot and ring rot.
Gall causes an overgrowth of cell walls.
Wet soil, high humidity, and high temperatures favor bacterial growth. Too much nitrogen encourages bacterial wilt. Sanitize garden tools with denatured alcohol to keep from spreading diseases. After handling infected plants, sanitize hands and clothing.