谷城县庙滩镇邓家湾二组王平华:推广杂交稻以来,我组每年栽培中稻15公顷。近两年,每到8月下旬稻谷快要成熟时,稻穗上便长出蚕豆般大小的黄灰包。经我组农民试验,稻穗上长黄灰包后,667平方米一般减产120公斤左右,严重的减产215公斤。1992牛我组有10公顷中稻发病,少收稻谷17500多公斤,损失很大。这是一种什么病?试用什么药防治?恳求解答。 湖北省农科院植保所钱汉良答:稻穗上长黄灰包是一种病害,此病叫稻曲病。稻曲病近年有逐渐加重为害的趋势,已成为影响水稻产量和质量的主要病害之一。 识别 稻曲病只在穗部发生,为害单个谷粒,一般一穗谷有一至数粒谷受害,也有多到十几粒谷受害的。稻曲病菌在谷粒 Wang Pinghua, Deng Jia Wan, Miaotan Town, Gucheng County: Since the promotion of hybrid rice, the group has cultivated 15 hectares of middle rice every year. In the past two years, every year when the rice is about to mature in late August, yellow-gray packets of broad bean-like size are grown on the ears of rice. After my group of peasants experiment, after the long yellow paddy on the ears, 667 square meters generally reduce the output about 120 kilograms, a serious reduction of 215 kilograms. 1992 cattle I group 10 hectares of medium-sized rice incidence, less than 17,500 kilograms of rice, a great loss. What kind of disease is this? Try what medicine to prevent? Hubei Academy of Agricultural Plant Protection, Qian Hanliang A: The long yellow on the rice pan is a disease, the disease is called False smut. In recent years, the development trend of rice germ is aggravating, which has become one of the main diseases that affect the yield and quality of rice. Identification of smut only occurs in the spike, damage to a single grain, usually a grain of valley suffering from one to several valleys, but also to more than a dozen grain damage. Ustilagic bacteria in the grain