Effect of crop rotation and chemical soil treatment on bacterial wilt of potato.
In a 5-year crop rotation trial, potato-wheat-lupin-maize-potato and potato-wheat-potato-maize-potato rotations reduced potato bacterial wilt (caused by Pseudomonas solanacearum) from 80.1% (in continuous potato crops) to 6.3 and 7.5%, respectively, in the 5th year potato crop. Tuber rot was reduced from 62.2% to 9.5 and 12.9%, respectively, and healthy yield increased by 194.1 and 150.4%, respectively. Data collected over 3 years revealed that preplant soil application of bleaching powder in furrows at 50 g/m2 controlled the disease by 68.4%. Copper sulfate and bleaching powder at 15 g/m2 reduced wilt by ≥50%.