Basal plate splitting

Basal plate splitting is a physiological disorder and agricultural problem affecting bulb crops, primarily onions and garlic. It involves the mechanical rupture of the bulb's basal plate, which compromises the structure of the bulb and creates entry points for various secondary soil-borne pathogens.

The primary crops affected by this condition are bulb onions and garlic. While it is often considered a physiological response to environmental stress, the splitting of the basal plate can be exacerbated by fungal pathogens such as Fusarium species, which colonize the damaged tissue and cause further decay.

Symptoms include visible cracks or vertical splits in the basal plate of the bulb. Above-ground symptoms may manifest as stunted growth, leaf chlorosis, and premature wilting. In more severe cases, the bulb becomes misshapen, and the interior tissues may show signs of discoloration or secondary rot.

The development and distribution of this condition are heavily influenced by soil moisture fluctuations. Sudden irrigation or heavy rainfall following a period of drought causes rapid bulb expansion that the basal plate cannot accommodate, leading to splitting. High soil temperatures may also play a role in promoting the decay of the split tissue.

The economic impact of basal plate splitting is significant due to the reduction in shelf life and marketability of the bulbs. Damaged bulbs are highly susceptible to storage rots. Protective measures focus on irrigation management, selecting appropriate cultivars, maintaining soil health, and practicing crop rotation to minimize pathogen pressure in the soil.