Mottled stripe

Mottled stripe is a significant bacterial disease affecting sugarcane, caused by the pathogen Herbaspirillum rubrisubalbicans. This disease is recognized for its ability to colonize the vascular tissues of the host plant, leading to systemic infections that impair the plant's metabolic functions and overall structural integrity.

The primary host for this pathogen is sugarcane (Saccharum officinarum). While it mainly impacts sugar yields, the infection can also weaken the stalks, making them more susceptible to secondary infestations and environmental stress, ultimately leading to significant economic losses for commercial growers.

The symptoms of Mottled stripe are visually distinct, manifesting as narrow, elongated stripes on the leaves with ragged, mottled margins. These stripes often start as light yellow or reddish lines that eventually turn necrotic. The severity of the leaf damage can vary depending on the plant's resistance levels and environmental conditions.

Epidemiological spread of the disease is highly dependent on humidity and temperature. High moisture levels favor the bacterial multiplication and movement, while the primary mode of transmission is via infected planting material. Furthermore, rain splash and contaminated agricultural machinery facilitate the spread within and between fields.

Prevention is the cornerstone of managing Mottled stripe. Agronomists recommend using disease-free planting material, often obtained through thermal treatment or tissue culture. Furthermore, selecting resistant sugarcane varieties is the most sustainable approach to minimize the impact of Herbaspirillum rubrisubalbicans on field productivity.