Complete cessation of top growth death of roots, which become dark & adhere together.  Yellowing of leaves & shortening of internodes become very marked.  Upper leaves form a rosette.  Buds of growing points die.  Lower leaves, which remain dark green, become stiff & brittle.  Opening of flowers will delay.

CaCl2 @ 5 g/lit or CaNO3 5g/lit as foliar spray at 10 days intervals.