Ralstonia solanacearum (Pseudomonas solanacearum(Botanical)
Total yield losses can be seen where fields are infested with bacterial wilt. Water melons are known to be immune to bacterial wilt. The first sign of bacterial wilt is wilting of 1-2 leaves (or a part of the plant) on young plants during the day and these recover at night. Initially the area between leaf veins dies and browns. Whole green plants wilt and recover at night but eventually die. The main stem of affected plants usually remains even though leaves may wilt and die. To diagnose the disease, one can cut the stem at the base, whitish thread like strands of bacterial ooze can be seen when suspended in water. Look for discolored tissue. In potatoes, the infested tuber releases the bacteria on its 'eyes'.
practice proper sanitation, crop rotation, avoid injury to the crop, control of beetle vectors. There are no effective chemical control methods for bacterial wilt