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Relationship Between Rice Hispa Damage and Yield Loss

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

Mohammad Fazle Rabbi
PSO and Head
Entomology Division, BRRI, Gazipur-1701

Abstract/ Executive Summary:

BR3 suffered the highest crop loss than the other varieties due to rice hispa infestation. Among the tested varieties BR22 and BRRI dhan29 occurred lower yield losses due to rice hispa damage in Aman and Boro seasons respectively. Due to hispa damage plant height, leaf and stem wt and panicle numbers were significantly reduced for most of the varieties; these reductions ultimately caused lower yields in the infested plants than the control plants.

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

Location: BRRI, Gazipur

Start Date: 01-07-2005

End Date: 30-06-2006

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 rice due to rice hispa damage in different BRRI varieties was studied at BRRI farm Gazipur during T. Aman 2005 and Boro 2006 seasons. The rice varieties were BR3, BR11, BR22, BRRI dhan30 and BRRI dhan40 in T. Aman; and BR3, BRRI dhan28 and BRRI dhan29 in Boro season. The experiments were conducted in RCB design with four replications. A large field was divided into four blocks, each block containing unit plots of 4m X 5m. Number of unit plots depended on the number of test varieties. In a block each of the varieties was assigned to an unit plot. Four rice hills per plot were confined by white nylon mesh net supported by iron frame at 40 days after transplanting. Forty adult hispa were released on these hills. The beetles were removed when a 60% leaf damage was incurred to the plants. Effect of leaf damage on different plant and yield contributing characters such as tiller no., plant height, stem and leaf wt, panicle no., grain wt. were recorded. In each plot another set of four hills were kept free from any insect damage and was used for comparison of yield contributing characters and grain yield with the infested plants.

Source of Information: Proceedings of BRRI Annual Internal Review for 2005-2006

Article Link (Online Journal):

Funding Source:

1. Government

Budget:

Total Budget (Tk.) :

Achievement/Findings:

In T. Aman 2005, highest yield loss occurred to BR3 (29.77%) and lowest to BR22 (22.5%). For most of the varieties plant height, dry stem and leaf wt was significantly lower in infested plants compared to control plants. Such effect of leaf damage on yield contributing characters has resulted in yield reduction in plants affected. In Boro 2006 two types of control plants were used, one with nylon net and another without net, to know the effect of nylon net on grain yield. No significant difference in yield was observed among these two control treatments. Yield loss was found highest in the BR3 (24.75%) and lower in the BRRI dhan29 (18.12%). Due to hispa damage plant height, leaf and stem wt and panicle numbers were significantly reduced for most of the varieties; these reductions ultimately caused lower yields in the varieties than the control plants.

Knowledge Management: Report/Proceedings