• Effectiveness of practiced management option to control of rice sheath blight

  •   | 
  • 01/04/2016

Md. Shahanur Rahman completed this BSc thesis at the Department of Agronomy and Agricultural Extension of the University of Rajshahi, Bangladesh.


Rice sheath blight disease, caused by Rhizoctonia solani, is a major problem for rice production in North-western Bangladesh. The disease thrives in warm and wet conditions. Climate change leads to increasing temperatures and altered rainfall patterns which promote the spread of sheath blight. In an earlier experiment, several management options for sheath blight had already been tested. This experiment was designed to validate the results in the field and to identify sustainable management options for local farmers.

A trial was conducted in the upazillas[1]Baraigram (Natore district), Paba (Rajshahi district) and Patnitala (Naogaon district), Bangladesh. Trial plots were established on farms participating in SAF-BIN project. Rice variety Swarma was used. The tested management options were T1= Collection of floating debris (FD) + Fungicide (Folicure) and T2= Fungicide (Folicure) + MOP[2]. The trial was laid out in a randomized Complete Block Design with three replications. Data on fertile tillers/plant, grains/panicle, thousand grain weight (TGW), yield, sheath blight incidence (%) and drought duration was collected.

In all locations, fertile tillers per hill (T1: 12.2-14.6; T2: 12-17.4), TGW (T1: 21.5-22.4g; T2: 21.2-23.4g) and grains/panicle (T1: 130-163.4; T2: 128 – 181.6) were higher in T2 than in T1. But these differences were not statistically significant. There was a statistical influence of location on grains/panicle and TGW.In general, both the treatments successfully suppressed the disease progress from the uppermost leaf sheath to other photosynthetic parts of the plants. This kept the severity index below the economic threshold resulting in minimal yield loss. However, T2 was more successful if disease incidence (T1: 20-80%; T2: 17-60%) and grain yield are concerned.In Baraigram the trial plots suffered from more drought stress than in the other two which was the primary cause of yield losses.

[1]a geographical region in Bangladesh used for administrative purposes, sub-units of districts. (Wikipedia, 2015: access date 19/10/2015.

[2]fertilizsation with Mureate of Potash (MOP); ½ ofthe recommended dose of MOP, applied with the 2nd top dressing of urea.