Also known as crown rot in custard apple.
The bacterium Ralstonium solanacearum.
In custard apple
Often occurs on trees that have just started cropping. Wilting is most common in late summer.
|How does it spread?|
The bacterium is common in soil and is carried over in crop residues and weed hosts. It spreads in irrigation and rain water, particularly downhill, and may spread by root contact.
Potato, tomato, eggfruit, capsicum and custard apple.
Do not crop infected soil through summer. There is no treatment for the affected crop. In future crops, use certified seed and whole (round) seed. Also develop a crop rotation program that avoids planting potatoes, and other hosts such as tomatoes, in the same site for at least two and preferably five years.
Avoid planting in areas that have grown tomatoes, potatoes, eggfruit or capsicums within the past two years. Do not plant in poorly drained sites and improve drainage by mounding. Use cherimoya rootstocks.
Chemical registrations and permits