1. Rice Seedling Rot Disease
Seedling rot refers to the general term for seed decay, bud decay, and dead seedlings that occur in rice seedling bed. During the seedling cultivation period, severe seed decay, bud decay, and death of seedlings often occur when hit by cold waves.
Seed decay refers to seeds that fail to germinate or rot and do not sprout after sowing.
Bud decay refers to the phenomenon of bud and root death during the germination to tillering stage. In production, low temperature and oxygen deficiency contribute to the development of the disease. Favorable conditions for its occurrence include cold waves, low temperatures with rain, excessive water depth in the seedbed, and immature organic fertilizers.
Seed decay is mainly caused by moisture during the storage period, insufficient soaking during seed treatment, infrequent water changes, and excessively high or prolonged low germination temperatures. Bud decay is mostly caused by oxygen deficiency in waterlogged seedbeds or scalding due to excessive heat.
2. Rice Seedling Blight Disease
This disease often occurs in upland rice seedling bed and is a common and significant disease in such environments. The symptoms manifest as yellowing and withering of the leaf tips, sparse root hairs, and initial cluster formation on the seedbed. After the fourth leaf stage, the disease progresses rapidly, causing wilting and withering of clustered seedlings, ultimately leading to their death.
Low temperature, rain, and insufficient light are important factors that contribute to the occurrence of rice seedling blight disease, with low temperature having the greatest impact. Under low-temperature conditions, the seedlings' disease resistance decreases, favoring disease development. Prolonged cold weather or sudden sunshine following rain, along with inadequate soil moisture, disrupts the physiological balance of seedlings, exacerbating the disease.
3. Rice Bakanae Disease
Diseased seedlings affected by Rice Bakanae Disease exhibit thinner and taller growth compared to healthy seedlings, with slender and pale yellow leaves, and poor root development. Some diseased seedlings die before transplantation.
On the withered seedlings, a light red or white powdery substance can be observed. The affected areas exhibit elongated internodes, often with curved portions exposed outside the leaf sheath. The lower nodes typically produce numerous adventitious roots while exhibiting limited or no tillering. Peeling back the leaf sheath reveals dark brown streaks on the stem. Cutting open the infected stem reveals white thread-like fungal mycelium, followed by gradual withering of the plants. In high humidity, the surface of the withered plants becomes covered with a light brown or white powdery mold-like substance. Later in the progression, small black dots, which are fungal spore cases, appear.
To address the aforementioned diseases, we recommend using Brightmart’s Rice Seed Treatment Agent, NewSpring. Dilute 100ml of NewSpring with 1L of water to coat 50kg of rice seeds.
New Spring（Metalaxyl-M 3.3% + Azoxystrobin 6.6% + Fludioxonil 1.1%）
Trial Results:
Crop: Rice
Dosage: 100ml of New Spring mixed with 1L of water for coating 50kg of rice seeds.
Target: Rice Seedling Rot Disease, Rice Seedling Blight Disease
Treated group The blank control group 
