Damaging diseases of rice and their management

摘要

At present 13 diseases are found to attack on rice in Punjab, out of which 3 diseases like Bacterial leaf blight sheath blight and sheath rot are major ones which cause high yield losses. Rice in Punjab is infected with various diseases few of whichcause high economic losses. At present 13 diseases are found to attack on rice in Punjab, out of which 3 diseases like Bacterial leaf blight, sheath blight and sheath rot are major ones which cause high yield losses. False smut, stem rot and brown spotare emerging diseases intensity of which varies from light to severe. On the other way, minor diseases occurring in the state are kernel bunt, leaf scaid, narrow brown leaf spot, bacteria! leaf streak, blast and foot rot which require regular monitoringthroughout the state for any change in their status, The most damaging diseases which are of concern in the state are discussed below: Bacterial leaf blight-Bacterial leaf blight of rice is the most serious among the major diseases in Punjab known to occur since the time of pre-partitioned Punjab. The disease, first observed in Gurdaspur district was called Pansukh in the local language which means blighting or leaf drying. It was considered to be due to some physiological disorder and only 1965 was itsetio ogy established. Since then the d^sase has been found to appear every year in varying degree in different areas of Punjab. During Kharif 1980, it assumed as epiphytoiic form and caused considerable yield loss throughout the State, in some areas ofAmritsarand Gurdaspur as high as 60-70 percent. The kresek phase of the disease was also recorded in some fields for the first time. Now bacterial leaf blight appears in almost ail the rice growing area of Punjab, its secondary spread depending upon climatic conditions.