Symptoms of tipburn are not usually visible from the outside of the lettuce plant, but if you break open
an affected head, you will see that the edges of the internal leaves are brown. The necrosis may involve
a few spots along the margin or the whole edge of the leaf may be affected. The lesions are frequently
invaded by soft-rotting bacteria that can cause severe decay.
Tipburn is a physiological disorder related to calcium deficiency and aggravated by high soil fertility
and high temperatures. Hold nitrogen levels as low as possible, and do not apply excessive fertilizers
that might compete with calcium uptake. Follow good irrigation
practices and avoid water stress.
of butter lettuce