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Species Composition of Rice Stemborers in Kushtia Region

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

Md. Mamunur Rashid
Scientific Officer
BRRI regional station, Kushtia

Abstract/ Executive Summary:

The stemborer infestation was low in Aus season ranging in between 0.0-9.6%. The yellow stemborer, Scirpophaga incertulas was the dominating species in Aus season followed by dark headed borer, Chilo polychrysus (13.8% ) and that of pink borer, Sesamia inferens (4.6 % ).

Keywords: Species composition, Stemborer, Rice

Location: BRRI reginal station Kushtia

Start Date: 01-07-2008

End Date: 30-06-2009

Program Area: Pest Management

Commodity: Rice

Objectives:

To know the species composition of stemborers in Kushtia region

Methodology:

The relative abundance of rice stem borers infesting rice fields was studied at farmer's field of Koshabaria in Kushtia. The study was carried out by counting the larvae of different species of stem borers found from the dissection of infested tillers during T. Aus 2008. The infested tillers (manifested by DH and WHs) were collected from 4 fields of BRRI dhan48. The fields were managed under farmers’ practice. The fields were left open for natural infestation of insect pests. Samplings for dissection were made approximately at 15 days interval from the day of transplanting and continued till the flowering stage of the crop. Data on infestation level of each of the field was also recorded on each of the sampling dates. About 50 infested tillers were collected from four fields on each sampling date. The collected tillers were dissected and the number and species of the larvae found from them were recorded. The number of the larvae was presented as the percentage of the total larvae found.

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:

The stemborer infestation was low in Aus season. The highest infestation (9.6%) in the field was observed at mid tillering stage. The borer infestation ranged in between 0.0 – 9.6%. A total of 296 infested tillers were dissected during the season and 87 larvae of borers were found. The yellow stemborer (YSB), Scirpophaga incertulas dominated (81.6%) the borer population. The dark headed stemborer (DHB), Chilo polychrysus, population was 13.8% and that of pink borer (PB), Sesamia inferens was only 4.6 % in Aus season.

Knowledge Management: Report/Proceedings