Tatumella citrea

Tatumella citrea is a gram-negative bacterium responsible for a significant post-harvest disease in citrus fruits known as pink rot. As a member of the Enterobacteriaceae family, this pathogen is capable of causing rapid decay, leading to substantial economic losses in the citrus packing and distribution industry.

The disease primarily affects various citrus species, including lemons, oranges, and grapefruit. The infection typically initiates through physical damage, insect bites, or natural openings in the fruit peel. Once inside, the bacteria multiply rapidly, utilizing the sugars and nutrients within the citrus tissue.

Symptoms are distinct and easily identifiable: the internal segment tissue of the infected fruit changes color from normal to a translucent pink or pale red. As the decay advances, the fruit softens, and the infected areas may develop an offensive, sour odor, eventually leading to the collapse of the entire fruit structure.

The proliferation of Tatumella citrea is heavily dependent on environmental conditions. High humidity levels and improper temperature management during storage and transit create an ideal climate for the bacteria to thrive. The presence of secondary opportunistic fungi or other bacteria often accelerates the degradation process once the initial infection has taken root.

Effective management requires a multi-layered approach focusing on sanitation and physical protection of the fruit. Growers and exporters should prioritize minimizing harvest injuries, conducting rigorous post-harvest sorting to remove damaged fruit, and utilizing effective sanitizing dips. Furthermore, maintaining strict climate-controlled storage conditions is essential to prevent the bacterial colonization of healthy fruit batches.