稻瘟病又称稻热病,俗称地火,是水稻常见的重要病害之一。水稻叶、节、穗、谷都能受害,其中以穗颈稻瘟对产量的影响最大,流行年份,受害的田块可减产三到五成。 1.叶稻瘟 病斑有急性、慢性、白点和褐点四种类型。而一般常见的是急性型和慢性型两种。①急性型:病斑暗绿色,有水影模样,椭园形,少数不规则形,大病斑两端稍尖.背面密生灰 Rice blast, also known as rice fever, commonly known as ground fire, is one of the most common diseases in rice. Rice leaves, knots, spikes, valleys can suffer, of which paniculaceous blast caused the greatest impact on yield, epidemic years, victims of plots can be reduced by three to five percent. 1. Leaf blast plaque acute, chronic, white spots and brown spots four types. The common is acute and chronic type two. ① acute type: dark green spot, a water shadow appearance, oval-shaped, a few irregular shape, large lesions at both ends slightly pointed.