LEAF TIPBURN ON STRAWBERRY
Several reasons for this disease have been described; such factors as soil and air humidity, soil temperature, day length, concentration of nutrients in the soil, and the growth vigour of the young plants certainly affect the incidence of strawberry tipburn.
From the literature, it is clear that strawberry leaf tipburn could be attributed to calcium deficiency; although tipburn may occur in fields with high amounts of Ca in the soil, and experiments show that spraying young strawberry plants of susceptible varieties in a predisposed tipburn field with a foliar spray of Goemar B (0.5 % boron) suppressed tipburn symptoms.
In general, tipburn is positively correlated with a high nutrient solution content in the soil. There was no correlation with Ca and B in the soil so that the uptake and transport of Ca is probably more important than the absolute amount of Ca in the soil.
There was a positive correlation between tipburn occurence and the type of runner production; young plants from cuttings were damaged more severely than plants of runners from a propagation field. Experiments with Goemar (with and without B) made clear that this foliar spray supplied Ca to young developing leaves. These experiments confirm that root pressure and transport of Ca, as influenced by a lot of ecological factors, is a key in understanding tipburn damage.