symptoms
Symptoms
- circleSmall, angular, water-soaked spots on leaves
- circleSpots turning brown to black with a yellow halo
- circleSpots merging into larger dead patches, causing leaf drop
help
Causes
Caused by Pseudomonas or Xanthomonas bacteria that spread via splashing water and contaminated tools, favored by warm, humid conditions and overhead irrigation.
healing
Treatment
Remove and destroy affected leaves, avoid working with wet foliage, and apply copper-based bactericide to slow spread on valuable plants.
shield
Prevention
Water at the soil level rather than overhead, space plants for airflow, and use disease-free seed or transplants.