Malvastrum leaf curl

Malvastrum leaf curl is a serious viral disease caused by the Malvastrum leaf curl virus. This pathogen belongs to the Geminiviridae family, specifically the Begomovirus genus. The virus contains single-stranded DNA and causes systemic infection in susceptible hosts by altering hormonal balances and disrupting normal plant developmental pathways.

Key crops susceptible to this disease include members of the Malvaceae family, such as cotton, mallow, and hibiscus. In addition to commercial crops, the virus can persist in various weed species, which act as alternative hosts and reservoirs, ensuring the survival of the pathogen between cropping seasons.

Symptoms of the infection typically include severe distortion of leaves, downward curling of leaf margins, vein thickening, and yellowing or mosaic patterns. Plants infected at an early stage exhibit significant stunting, reduced internode length, and sparse foliage, which ultimately leads to a drastic reduction in biomass and yield production.

Transmission of the virus occurs via a specific insect vector: the whitefly (Bemisia tabaci). The virus is acquired by the insect through feeding on infected phloem tissue and is then transmitted to healthy plants. High temperature and humidity levels are known to facilitate rapid proliferation of the whitefly population, thereby increasing the speed and scope of disease spread.

The economic impact of this disease is high due to substantial losses in agricultural productivity. Management strategies should include:

• Utilizing disease-resistant or tolerant crop cultivars.
• Rigorous monitoring and control of whitefly populations with systemic insecticides.
• Sanitation practices, including the removal of infected host weeds.
• Implementation of appropriate crop rotation and spatial isolation.