Hedyotis leaf curl begomovirus

Begomovirus hedyotis is a plant pathogen belonging to the genus Begomovirus within the family Geminiviridae. These viruses are characterized by a circular, single-stranded DNA genome. The pathogen primarily interferes with the plant’s genetic expression, causing significant physiological stress and disrupting developmental pathways, which leads to stunted growth and reduced crop productivity.

The primary hosts for this virus are plants within the Rubiaceae family, particularly the Hedyotis genus. Due to the broad host range of related begomoviruses, the disease can sometimes bridge the gap to other susceptible ornamental or vegetable crops grown in tropical or subtropical environments, acting as a reservoir for further transmission.

Symptoms of the infection typically include severe leaf curling, twisting, and puckering. Infected leaves often exhibit chlorosis (yellowing) or a mosaic pattern of light and dark green areas. As the disease progresses, the plant architecture becomes distorted, with shortening of internodes and reduced leaf size. The reproductive output is heavily impacted, resulting in flower drop and malformed fruits or seeds.

The virus is transmitted by the whitefly Bemisia tabaci in a circulative, non-propagative manner. The insect acquires the virus while feeding on infected plant sap and remains a carrier for the duration of its life. Factors favoring disease spread include warm, humid conditions that encourage rapid whitefly multiplication and the presence of alternate weed hosts that sustain the virus during off-seasons.

Control strategies for Begomovirus hedyotis rely on integrated pest management (IPM). Since no chemical curative treatments exist for plants infected with viruses, prevention is paramount. Key management practices include the use of virus-free planting materials, aggressive control of whitefly populations using yellow sticky traps and appropriate insecticides, and rigorous weed management to eliminate alternative hosts around the cultivation area.