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Screenings of Elite Lines/varieties Against Major Insect Pests of Rice

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

Mahfuj Ara Begum
SSO
Entomology Division, BRRI, Gazipur-1701

Abstract/ Executive Summary:

A total of 471 entries along with 7 F2 materials were screened against BPH, GLH, WBPH and SB. out of these 4 germplasm materials (3 against GLH and one against BPH) and 7 advanced lines (3 against BPH and 4 against WBPH) were promising. In addition to these, 120 lines were selected against gall midge (GM).

Keywords: Screening, Rice variety, Resistance, GLH, BPH

Location: BRRI Gazipur and Natore

Start Date: 01-07-2007

End Date: 30-06-2008

Program Area: Pest Management

Commodity: Rice

Objectives:

Identification of resistant sources materials against major insect pests and development of resistant varieties

Methodology:

A total of 431 entries, germplasm (150), breeding lines (281), were screened against brown planthopper (BPH), white backed planthopper (WBPH) and green leafhopper (GLH) during 2007-08. In addition to this 7 F2 materials were screened against BPH during the year. The screening was done by seedling bulk test method in the BRRI greenhouse of Entomology Division. Moreover for selection of progenies against gall midges thirty-day-old seedlings of two crosses of F3, 2 crosses of F4 and 6 crosses of F5 generations of selected materials were transplanted, for screening against gall midge (GM), in a farmer's field at Natore during T. Aman 2007. Seedlings were transplanted in 5.4 m long rows at 25X15 cm spacing with single seedling per hill. Plants were evaluated at maximum tillering stage and plants manifesting onion shoots were removed and destroyed.

Source of Information: Proceedings of BRRI Annual Internal Review, 2007-08

Article Link (Online Journal):

Funding Source:

1. Government

Budget:

Total Budget (Tk.) :

Achievement/Findings:

Out of these materials 4 against BPH, 4 against WBPH and 3 against GLH were found promising (score 3-5). The selected resistant F2 plants found from F2 screening were handed over to relevant scientists of Breeding Division for variety development. Plants found healthy (without GM infestation) were selected. The selected lines were stored for further confirmation.

Knowledge Management: Report/Proceedings