Curled or distorted leaves
Spike leaf
Cause: A temporary shortage of calcium caused by rapid growth. Most common in spring and early summer.
Solution: Avoid sudden bursts of growth by using regular, light fertiliser applications. A foliar application of calcium nitrate at 10 g/L in early spring will reduce the problem.
2,4-D damage
Cause: Spray drift of 2,4-D onto green parts of the plant.
Solution: Take efforts to avoid spray drift onto leaves. Plants should grow out of it.
Tissue-cultured off-type
Cause: A genetic abnormality that occurs in tissue-cultured plants.
Solution: Destroy affected plants and set additional following suckers on nearby plants.
