Cause: Unknown Red Stripe (URS) or Red Stripe (RS) is a relatively new rice disease that was first discovered in Subang, West Java, in 1987. This disease generally occurs in leaves, rice fields with poor drainage conditions, and plants that have reached the generative growth phase. This disease causes the grain is not to be fully filled or even empty. HDJ is negatively correlated with site height because the higher the site, the milder the disease. Until now, the cause of the disease has not been identified with certainty.
Symptoms of the disease begin with a tiny orange dot (orange) on the leaf blade. From this point, a straight line (stripe) is formed, orange, towards the tip of the leaf. This line is never toward the base of the leaf.
In its development, these symptoms become blight (blight), similar to the symptoms caused by bacterial leaf blight. Orange leaf blight is controlled by technical culture. The application of fertilizer with a dose of 250 kg urea, 100 kg SP36, and 100 kg KCl per ha can suppress disease development.
The disease can also be suppressed by drying the land and opening the crop canopy to reduce humidity and improve air circulation in the canopy.
Source: Putra, R. (2018). Hama dan penyakit tanaman padi dan deskripsi padi sawah. Balai Pengkajian Teknologi Pertanian Kepulauan Riau.
Bacterial leaf blight (BLB) is a widespread bacterial disease and reduces yields by up to 36%. The disease occurs in the rainy or wet-dry season, especially in paddy fields that are constantly flooded and fertilized with high N (> 250 kg urea/ha). BLB disease produces two distinctive symptoms, namely crackle, and blight. Crackle is a symptom that occurs in plants <30 days old (nursery or newly moved). The leaves are gray-green, folded, and curled.
Sheath blight is a significant disease in rice plants. This disease destroys the midrib, so it is necessary to open the planting canopy to find and recognize the condition. The disease causes plants to fall quickly. The earlier it falls, the greater the loss it causes. This disease causes the grain to be less filled or even empty. Sheath blight usually occurs when the plant begins to form tillers until just before harvest.