Curtobacterium wilt

Curtobacterium citreum is a species of phytopathogenic bacteria known to cause vascular wilting and necrotic lesions in a variety of botanical hosts. These bacteria reside primarily within the xylem tissue of the plant, where they multiply and secrete enzymes that obstruct the transport of water and nutrients, leading to systemic physiological stress.

The host range of this pathogen includes various vegetable crops, ornamental plants, and occasionally field crops. In many agricultural settings, infection leads to significant economic loss due to reduced yields and inferior quality of harvested products. The bacteria can persist in soil, seed stock, and contaminated plant debris for extended periods.

Symptoms of the infection typically manifest as foliar chlorosis, localized wilting that progresses to total plant collapse, and vascular browning upon dissection of stems. Under high humidity, the bacterial pathogen may form biofilms or produce exudates, which further facilitate its dispersal throughout the field via rain splash or irrigation water.

Environmental conditions such as moderate to high temperatures and prolonged leaf wetness are critical factors favoring disease development. The pathogen often enters the host plant through wounds caused by insect feeding, pruning, or weather-induced damage. Consequently, managing primary entry points is essential for controlling the disease spread.

Control and prevention strategies center on a multi-faceted approach, including the use of certified pathogen-free seeds and seedlings. Cultural practices, such as removing and destroying symptomatic plant tissue, sterilizing pruning tools, and implementing effective insect control programs, are paramount in limiting the impact of Curtobacterium citreum on commercial agricultural production.