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Relationship Between Rice Hispa Damage and Yield Loss

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

A. B. M. Anower Uddin
Scientific Officer
Entomology Division, BRRI, Gazipur-1701.

Dr. Mohammad Fazle Rabbi
CSO and Head
Entomology Division, BRRI, Gazipur-1701.

Abstract/ Executive Summary:

The BRRI developed rice variety, BRRI dhan42 has been identified to show low yield loss despite a considerable level of hispa damage. This variety might be recommended for hispa prone areas. Among the hybrid rice varieties BRRI hybrid dhan2 was also showed higher hispa damage tolerance than the BRRI hybrid dhan1 and BRRI hybrid dhan3.

Keywords: Rice hispa, Yield loss, Damage

Location: BRRI, Gazipur

Start Date: 00-00-2011

End Date: 00-00-2012

Program Area: Pest Management

Commodity: Rice

Objectives:

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

Methodology:

Yield loss of different BRRI varieties due to RH damage was studied at BRRI farm Gazipur during Aus and T. Aman 2011 and Boro 2012 seasons. Three Aus varieties (BRRI dhan42, BRRI dhan43 and BRRI dhan48), four T. Aman varieties (BRRI dhan51, BRRI dhan52, BRRI dhan53 and BRRI dhan54) and three Boro hybrid varieties (BRRI hybrid dhan1, BRRI hybrid dhan2 and BRRI hybrid dhan3) were included in the study. The varieties were grown in plots measuring 5×4m in size. The experiments were designed in RCB with four replications. Forty days after transplanting, four rice hills from each plot (represented as a replication) were covered by white nylon mesh nets and 20 pairs of adult hispa beetles were released in each cage. Similarly, another set of four hills from each of the same plots were also covered by same types of nets but without hispa beetles and were treated as control. The beetles were removed after incurring 60% leaf damage in all the seasons. The plant and yield contributing characters such as tiller number, plant height, stem and leaf weight, panicle number, filled grain number and weight were recorded.

Source of Information: Internal Review Workshop Paper, 2011-12

Article Link (Online Journal):

Funding Source:

1. Government

Budget:

Total Budget (Tk.) :

Achievement/Findings:

In Aus 2012, yield losses ranged from 4.962% to 50% . The highest yield loss occurred in BRRI dhan48 (50%) and the lowest in BRRI dhan42 (4.96%). Among the plant and yield contributing characters plant height was reduced due to hispa damage for all the varieties. The panicle/hill, leaf weight. stem weight were reduced only in BRRI dahn43. Number of filled grain was affected in case of BRRI dhan48. In T. Aman season yield losses were observed 30.75% to 44.66% for the test varieties. The highest yield loss occurred in BRRI dhan54 (44.66%) and the lowest in BRRI dhan53 (30.75%). Among the plant and yield contributing characters plant height, leaf weight, stem weight, filled grain weight were significantly reduced in damaged plants in comparison to undamaged ones. Panicle no./hill was significantly reduced in the varieties except BRRI dhan53. In Boro season, yield losses ranged from 15.43% to 37.24%. The highest yield loss occurred in BRRI hybrid dhan1 (37.24%) and the lowest in BRRI hybrid dhan2 (15.43%). Plant height was significantly reduced in all the varieties due to rice hispa damage. No significant difference was found in case of panicle no. and leaf weight for BRRI hybrid dhan1 and BRRI hybrid dhan2. Filled grain number and filled grain weight were also reduced in the varieties except BRRI hybrid dhan2. Stem weight was affected only in BRRI hybrid dhan2.

Knowledge Management: Report/Proceedings