早稻秧苗水育改旱育后,发生了一些有别于水秧的新病害,育秧期间对这些病害正确识别,及时对症防治很重要。1.恶苗病恶苗病以徒长型为多见,一般在秧苗2.5叶后,气温达30℃左右时病苗迅速长高,可比正常苗高出三分之一以上,假茎和叶片细长,苗色淡黄、根数少,严重时发生死苗。往往是粳稻比籼稻发病重,旱育秧比水育秧发病普遍。水育秧改旱育秧后,该病迅速上升为苗期的主要病害之一。恶苗病由串珠镰孢菌引起,以种子带病为主,在浸种催芽 Early rice seedling hydroponics to drought-resistant, there have been some new diseases that are different from the water-seedlings, seedlings during the correct identification of these diseases, timely and symptomatic prevention and control is very important. 1. Bacteriosis Sickle disease is more common in the form of legs, usually 2.5 leaves after the seedlings, when the temperature reaches about 30 ℃, the seedlings grow rapidly and can be more than one-third higher than the normal seedlings. The stems and the leaves are thin Long, seedling yellow, the number of small, severe seedlings occur. Often is the incidence of indica rice than japonica, dry seedling more common than the watering seedlings. After watering seedlings to drought nursery seedlings, the disease rapidly rose to one of the major diseases at seedling stage. Fungal disease caused by Fusarium moniliforme, mainly to take the seed disease, in the soaking seed germination