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Evaluation of Insecticidal Management of Yellow Stemborer Practiced by Farmers

Dr. Mohibul Hasan
Principal Scientific Officer
Entomology Division, BRRI, Gazipur-1701

Md. Mofazzel Hossain
SSO
Entomology Division, BRRI, Gazipur-1701

Abstract/ Executive Summary:

Stemborer infestation increased from vegetative stage to reproductive stage in both the seasons. The results of the two trials conducted in T. Aman and Boro season showed no significant difference in the level of stemborer infestation in respect of different treatments. Application of granular insecticides for the control of YSB was found ineffective in respect of infestation levels of the pest. The result was similar to the findings of the last year which indicated that the farmers derived no benefit from the application of insecticides in minimizing the loss caused by stemborers.

Keywords: Insecticide, Evaluation, YSB

Location: BRRI, Gazipur

Start Date: 01-07-2008

End Date: 30-06-2009

Program Area: Pest Management

Commodity: Rice

Objectives:

To evaluate the farmers' practice of controlling yellow stemborer by commonly used granular insecticide.

Methodology:

Two trials were carried out in two consecutive seasons (T Aman 2008 & Boro 2009) at BRRI farm, Gazipur. BR3 seedlings were transplanted at 20 cm X 20 cm spacing in plots measuring 5m X 8m in size. There were five treatments viz. 1.Insecticide application at 15 days interval, 2. Insecticide application at 1st top dressing, 3.Insecticide application at 2nd top dressing,4. Insecticide application at ETL and 5. Control (no insecticide). Each treatment had three replications. Both the experiments were laid out in RCB design. The plots were left exposed to natural infestation of the insect pests. Carbofuran 5G was used in the trials. Data on dead hearts (DH) at vegetative stage and white heads (WH) at reproductive stage were collected from 20 randomly selected hills along the diagonals of each plot.

Source of Information: Proceedings of the BRRI Annual Internal Review, 2008-09

Article Link (Online Journal):

Funding Source:

1. Government

Budget:

Total Budget (Tk.) :

Achievement/Findings:

During T. Aman season, stemborer infestation at vegetative stage (39 DAT) was lower but increased substantially at Booting stage (66 DAT) and reached the ETL level for stemborers irrespective of the treatments received by the plots. Comparatively lower infestation was observed in plots having insecticides at 15 days interval and that received application at 2nd top dressing. However, no significant difference was found in the level of infestation in respect of the treatments. White head counts, observed at reproductive stage, also showed no significant difference in respect of the treatments and the infestation levels was around 2% (WH) even in the control. Likewise T. Aman season stemborer infestation was also low at the early stage of the Boro crop. The infestation was below the ETL. Higher infestation was observed at the reproductive stage of the crop. The white head counts crossed the ETL in plots having insecticides at 1st and 2nd top dressing. Highest level of WH (6.83%) was observed in plots receiving insecticides at 1st top dressing and were followed by plots receiving at 2nd top dressing and control plots. However, none of the treatments showed significant difference in the level of infestation (%WH). Even prophylactic application of insecticides at 15 days interval failed to show any significant difference in the level of infestation in comparison to that of the control plots (having no insecticides.

Knowledge Management: Report/Proceedings