Boron Deficiency in Mangold
Root and leaf symptoms of boron deficiency in mangold are very similar to those described for sugar beet, although the cracking of the epidermis on the midribs is possibly more common on mangold than on sugar beet.
Apart from the characteristic heart rot, death and blackening of the younger leaves, scabs, and galls may be found on the petioles of boron deficient mangold.