Sugarcane mosaic

The virus consists of flexuous, filamentous particles containing a single-stranded RNA genome.

It is an obligate parasite, meaning it can only replicate and survive within the living cells of its host plants.

The virus has a wide host range, primarily infecting members of the Poaceae family, including economically important cereal crops.

Identification is confirmed through molecular methods like RT-PCR or serological tests like ELISA, which detect the virus protein.

SCMV causes significant economic damage to sugarcane, maize, sorghum, and pearl millet crops globally.

The infection leads to reduced chlorophyll production, hindering the plant's ability to photosynthesize effectively.

Severely infected plants often show stunted growth, reduced stalk diameter, and lower overall biomass accumulation.

Yield losses in maize can be substantial, especially when infection occurs during the early vegetative growth stages.

In addition to reduced grain yield, the disease can lead to poor plant vigor and increased susceptibility to other pathogens.

The virus is primarily transmitted by aphids in a non-persistent, stylet-borne manner during their feeding activities.

Outbreaks often occur during periods of high aphid migration, typically in late spring and throughout the summer months.

Infected perennial grasses act as the primary reservoirs, allowing the virus to survive throughout the winter.

Field spread is often rapid if aphid populations are high and susceptible host plants are in close proximity.

Environmental conditions that favor aphid population growth directly correlate with the spread and severity of mosaic outbreaks.

Symptoms typically begin with chlorotic stripes or streaks forming parallel to the leaf veins.

A classic mosaic pattern develops on the leaves, characterized by a patchy distribution of light and dark green tissues.

Infected plants frequently exhibit dwarfing and, in some cases, distortion or crinkling of the younger leaf tissues.

Maize plants may show reduced ear size and poor seed set if the infection occurs early in the growing season.

• Chlorotic striping on leaves
• Distinctive mosaic spotting
• Plant stunting
• Leaf malformation
• Reduced grain filling

The use of resistant or tolerant crop hybrids is the most effective management strategy against Sugarcane mosaic.

Strict weed control in and around the fields is essential to remove alternative hosts that harbor the virus.

Insecticidal applications to manage aphid populations can reduce the rate of virus transmission during early growth.

Maintaining proper field sanitation and avoiding continuous cropping of susceptible varieties helps break the disease cycle.

Spatial isolation of new plantations from old sugarcane fields or infested wild grass areas reduces the risk of primary infection.