Delhi tomato leaf curl begomovirus

Begomovirus solanumdelhiquarti is a significant viral pathogen within the Geminiviridae family. It is a DNA virus that causes severe physiological disorders in Solanaceous crops, primarily affecting their vascular systems and disrupting normal leaf development and fruit maturation processes.

The primary host for this pathogen is the tomato plant (Solanum lycopersicum). However, the virus also targets other economically important plants such as peppers and eggplants. Various weed species act as natural reservoirs, allowing the virus to persist in the environment even when primary crops are not present.

Plants infected with this begomovirus typically exhibit stunted growth, upward leaf curling, and severe chlorosis. These symptoms are often accompanied by reduced internode length, which gives the plant a bushy appearance. Infected plants produce fewer fruits, which are often distorted and unmarketable, leading to substantial agricultural losses.

The virus is transmitted in a persistent circulative manner by the whitefly Bemisia tabaci. The epidemiology of the disease is closely tied to the lifecycle and migration patterns of this insect vector. Warm, dry climatic conditions significantly accelerate the population dynamics of the vector, thereby increasing the rate of viral spread throughout fields and greenhouses.

Management of this disease focuses heavily on integrated pest management (IPM) strategies. This includes the rigorous application of insecticides to reduce vector populations, the use of physical barriers like fine-mesh insect nets in greenhouses, and the removal of infected host plants to reduce the viral load. Breeding programs are also focused on developing resistant cultivars to mitigate the impact of this virus.