Bacterial Leaf Streak (Bakteri daun bergaris)

This disease usually occurs only on the leaf blade. Symptoms that arise in the form of narrow dark green spots that gradually enlarge to yellow and translucent between the leaf veins. The spots enlarge, turn brown, and develop sideways beyond the large leaf veins as the disease progresses. Under ideal conditions for infection, the entire plant becomes a yellowish-orange color. All leaves of susceptible varieties may turn brown and die.

Bacteria enter plants through mechanical damage or the natural opening of cells. Dew droplets containing bacteria will appear on the leaf surface. Rain and wind help spread the disease. The disease generally occurs in the tillering stage to the maturation stage. In severe cases, yield losses can be up to 30%.

BDB can be controlled in several ways, including:

• Remove or destroy infected/sick stubble and hay;
• Make sure the straw from diseased plants is completely decomposed before transplanting;
• Use seeds or seedlings that are free of streaky leaf bacterial disease;
• Use nitrogen fertilizer as recommended; set the spacing is not too tight; litter after harvest.

Source: Putra, R. (2018). Hama dan penyakit tanaman padi dan deskripsi padi sawah. Balai Pengkajian Teknologi Pertanian Kepulauan Riau.