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Relationship Between Rice Hispa Damage and Yield Loss

Md. Nazmul Bari
Senior Scientific Officer
Entomology Division, BRRI, Gazipur-1701

Dr. Mohammad Fazle Rabbi
PSO
Entomology Division, BRRI, Gazipur-1701

Abstract/ Executive Summary:

Lower yield losses due to rice hispa infestation were found in rice varieties BR1 (23.57%) and BR26 (23.28%) during Aus season. But in T. Aman and Boro seasons lower yield loss observed in BR25 (8.25%) and BR9 (12.97%) respectively. These varieties might be recommended for hispa prone areas in different seasons.

Keywords: Rice hispa, Yield loss, Panicle and Filleld grain

Location: BRRI, gazipur

Start Date: 01-07-2008

End Date: 30-06-2009

Program Area: Pest Management

Commodity: Rice

Objectives:

To determine the yield loss of different BRRI varieties due to rice hispa damage in different seasons.

Methodology:

Yield loss of different BRRI varieties due to rice hispa damage was studied at BRRI farm Gazipur during Aus and T. Aman 2008 and Boro 2009 seasons. Four each of Aus (BR1, BR2, BR14 and BR26), T. Aman (BR25, BRRI dhan44, BRRI dhan46 and BRRI dhan49) and Boro varieties (BR8, BR9, BR16, and BR17) were included in the study. The varieties were grown in plots of 5m X 4m. The experiments were designed in RCB with 16 replications. Forty days after transplanting, four rice hills from each plot were covered by white nylon mesh nets and 20 pairs of adult hispa beetles were released in each confinement. Similarly, another four hills from the same plot were also covered without hispa beetles and treated as control. The beetles were removed after incurring 60% leaf damage in all the seasons. The plant and yield contributing characters such as plant height, stem and leaf weight, panicle number, filled grain number and weight were recorded.

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 Aus 2008 yield losses ranged from 23.28-41.29%. The highest yield loss occurred in BR2 (41.29%) and lowest in BR 26 (23.28%) and BR1 (23.57%). Among the plant and yield contributing characters plant height, stem weight, filled grain number/hill and filled grain weight/hill were reduced due to hispa damage for all the varieties. Leaf weight/hill also reduced incase of BR2 and BR14. There were no significant differences in panicle number/hill for all varieties. In T. Aman 2008 yield losses ranged from 8.45-23.46%. The highest yield loss occurred in BRRI dhan44 (23.46%) and lowest in BR25 (8.25%). The plant height and filled grain number/hill were reduced for all the varieties due to hispa damage. Leaf and stem weight /hill and filled grain weight/hill were also reduced in all the varieties except BR25. The interactions of this reduction in plant and yield contributing characters ultimately caused reduction in yield for the test varieties. No significant difference in panicle number/hill was found in any variety except BRRI dhan44 like those of Aus season. Yield losses ranged from 12.97-26.24% during Boro 2009. A lower yield reduction was found with BR9 (12.97%). Plant height, stem weight, filled grain number/hill and filled grain weight/hill were significantly reduced in damaged plants in comparison to those of undamaged ones. Leaf weight also reduced in BR8 and BR17. The impacts of the effects of hispa damage on plant and yield contributing characters resulted in the yield loss of the varieties. No significant differences were observed among the treatments in panicle number per hill for all varieties except BR17.

Knowledge Management: Report/Proceedings