Bean golden mosaic virus

The virus is transmitted by the whitefly Bemisia tabaci. This insect vector acquires the virus by feeding on infected plant sap and transmits it during subsequent feeding on healthy hosts.

Once inside the plant, the virus infects the phloem cells, leading to systemic infection throughout the entire plant system. This interferes with the plant's ability to transport carbohydrates.

The virus relies heavily on the whitefly population for its survival and transmission, making its epidemiology closely tied to the life cycle and movement of the insect.

Genetic variability within the virus strains can lead to different levels of severity, posing a continuous challenge for plant breeders and pathologists.

The primary symptom is a distinct golden-yellow mosaic pattern on the leaves, caused by the localized depletion of chlorophyll in the affected leaf tissue.

Affected plants often show severe leaf deformation, including crinkling, cupping, and twisting, which significantly impairs the plant's photosynthetic efficiency.

Stunting is a common characteristic, as infected plants fail to reach their full growth potential, appearing much smaller than healthy counterparts in the field.

Reproductive success is severely hampered, with common symptoms including flower abortion and the formation of distorted or underdeveloped pods.

Under bright sunlight, the yellow coloration of the foliage becomes highly pronounced, often covering large areas of the plantation during severe outbreaks.

The spread of the virus is predominantly influenced by warm and dry climatic conditions, which are highly favorable for the proliferation of whitefly populations.

The presence of alternative weed hosts around the fields acts as a year-round reservoir, allowing the virus to persist even in the absence of a primary bean crop.

High temperatures accelerate the viral replication process within the plant and shorten the incubation period within the insect vector.

Human activity, such as moving infested seedlings or infected plant materials, can contribute to the long-distance dispersal of the pathogen.

The synchronization of planting dates with peak whitefly migration periods dramatically increases the risk of early-season infection, leading to higher damage levels.

BGMV is considered one of the most economically damaging viruses in bean cultivation, with potential yield losses reaching up to 100% in susceptible varieties.

The quality of harvested beans is severely impacted, resulting in small, shriveled seeds that lack the necessary vigor for future planting.

Premature senescence of the plant occurs as it redirects energy into combating the infection, leading to early mortality before the pods can fully mature.

Economic losses arise not only from reduced total weight but also from the failure to meet market standards for aesthetic quality and processing value.

Contaminated fields may remain unsuitable for immediate replanting due to the persistence of the virus in local weed populations and lingering whitefly pressure.

The most effective management strategy involves controlling whitefly populations through the strategic use of systemic and contact insecticides.

Breeding and planting resistant or tolerant cultivars remain the most sustainable and efficient approach to mitigate the risks associated with BGMV.

Implementing a strict sanitation program, including the removal of weeds and crop debris, is vital to eliminate the sources of the virus.

Crop rotation and geographical isolation from infected zones are essential to break the infection cycle of the virus and its vector.

• Deploying yellow sticky traps to monitor and reduce whitefly population density.
• Using high-quality, certified seeds to ensure the absence of initial viral inoculum.
• Optimizing planting times to minimize exposure to whitefly migration windows.