Cotton mosaic

Cotton mosaic is a serious viral disease that significantly impacts the growth and yield of cotton crops globally. It is primarily caused by specific viruses, often transmitted by whiteflies or aphids, which compromise the plant's vascular system, leading to stunted growth and reduced fiber quality.

The host range of the disease is predominantly the cotton plant (Gossypium species), but it can also affect various weed species in the Malvaceae family. These weeds act as primary reservoirs for the virus during the off-season, allowing the pathogen to persist and re-infect new cotton crops each year.

Symptoms of Cotton mosaic are typically characterized by a yellow-green mottling or mosaic pattern on the leaves. Infected plants often show signs of leaf curling, crinkling, and distortion. As the disease progresses, the plants become severely stunted, and the development of squares and bolls is significantly hindered.

The transmission of the virus is largely dependent on insect vectors, especially the whitefly (Bemisia tabaci). Environmental factors such as high temperatures and humidity increase the population density of these vectors, facilitating a faster spread of the virus across cotton fields during the peak vegetative stage.

Economic damage is substantial, as the disease directly reduces the yield per hectare and lowers the quality of the harvested fiber. Effective control strategies include the early detection and rogueing of infected plants, maintaining strict weed control to eliminate virus reservoirs, and applying systemic insecticides to manage the insect vector populations.