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

Md. Mosaddeque Hossain
Scientific Officer
Entomology Division, BRRI, Gazipur-1701

Dr. N. Q. Kamal
CSO and Head
Entomology Division, BRRI, Gazipur-1701

Abstract/ Executive Summary:

Different insecticides were used to control different insect pests of rice. But in most of the cases insect create resistance against the insecticides after long term use. To overcome this problem, resistance variety is required and varietal screening is prerequisite for the development of resistance variety. A total of 137 entries against each of Brown planthopper (BPH), white backed planthopper (WBPH), Green leafhopper (GLH) and rice hispa (RH) were screened by seedling bulk test method in the green house during T. Aman 2002 and Boro 2003 seasons to Identify resistant sources materials against major insect pests and development of resistant varieties. Seedling mortality scores were taken according to Standard Evaluation System (SES) after 5-6 days of infestation and found moderate resistant (MR) to BPH and WBPH only one entry each of T. Aman and Boro season. Three Boro entries were also found MR to GLH.

Keywords: Screening, Elite lie, GLH, BPH, Resistant varieties

Location: BRRI, Gazipur

Start Date: 01-07-2002

End Date: 30-06-2003

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 137 entries against each of Brown planthopper (BPH), white backed planthopper (WBPH), Green leafhopper (GLH) and rice hispa (RH) by seedling bulk test method in the green house during T. Aman 2002 and Boro 2003 seasons.Seedling mortality scores were taken according to Standard Evaluation System (SES) after 5-6 days of infestation.

Scoring: 0 = No damage, 1 = Very slight damage

3 = First and second leaves yellowing 5 = All leaves yellow, pronounced stunting or both

7 = More than half of the plants dead, remaining plants wilting, severely stunted

9 = All plants dead

Source of Information: Proceedings of BRRI Annual Internal Review for 2002-2003

Article Link (Online Journal):

Funding Source:

1. Government

Budget:

Total Budget (Tk.) :

Achievement/Findings:

Only one T. Aman entry, BR6390-24-1-6 was moderately resistant (MR) to BPH. Three T. Aman entries, BR6420-13-1-7, BAT RAJ-2 and PANI SAIL and two Boro entries, BR6731-6-3-3 and BR6732-9-4-2 were found moderately susceptible (MS) to BPH. Moderatly resistant to WBPH was found in one entry of Boro, BR6731-6-3-3. Three T. Aman and four Boro entries were MS to WBPH. Three Boro entries BR6734-4-4-3, BR6734-11-1-2 and BR6734-11-1-3 were MR to GLH.

Knowledge Management: Report/Proceedings