Hen and chicken is a disorder of

Hen and chicken is a disorder of Grape.
It is one of the most serious nonparasitic grapevine diseases. It is observed especially on strongly acid soils. It is a bunch disorder to describe bunches with berries that have a great range of size and maturity at harvest.
Only a few seeded berries are set, and most berries remain small and seedless. This is called hen and chicken, or the pumpkin and pea symptom.
It is observed that it is caused by a Boron deficiency.