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Screening of Transplanted Aman Rice Entries Against Brown Plant Hopper

Sheikh Shamiul Haque
PSO
Entomology Division,BRRI,Gazipur.

A.N.M. Rezaul Karim
Ex. CSO
Entomology Division,BRRI,Gazipur.

Abstract/ Executive Summary:

BR (BE)6155-1-1 was graded as highly resistant (RR), five entries viz. BR5970-14-1-3, BR6006-2-9-2, BR6133-28-2, BR6136-137-4 and IR62553-22-3-2 as resistant (R), fourentries viz. BR6006-1O-1-2, BR5640-23-3-4, BR (BE)6155-1-2 and BR5839-40-2-4 were graded as moderately resistant (MR). Out of rest 131 entries, 5 were graded moderatelysusceptible (MS) and rest as highly susceptible (HS). The cultivar BR3 used as check showed highly susceptible reaction and T27A showed resistant reaction to the insect. Lal andPathak (1993) performed similar type of experiment on rice to locate the resistant sources.

Keywords: Screening, Rice entry, Brown planthopper

Location: Green house, Entomology Division, BRRI, Gazipur

Start Date: 00-00-1996

End Date: 00-00-1996

Program Area: Variety and Species

Commodity: Rice

Objectives:

1) To findout resistant sources of brown planthopper for genetic improvement.

2) To identify suitable parents for further breeding programme.

Methodology:

This experiment was conducted in the greenhouse of Entomology Division at Bangladesh Rice Research Institute (BRRI), Gazipur, Bangladesh, during the year 1996. During growth period of plant the average rainfall, average maximum temperature, average minimum temperature, average solar radiation, average relative humidity and average sunshine hourwas 75.99 mm, 32.030c., 26.57°c., 315.42 cal/crn'', 70.71 % and 5.28 hr. respectively. In 1996, 141 rice entries of Transplanted Aman 1996 including a local resistant and a localsusceptible check were sown in seed boxes (60 x 45 x 10 ern) in two replications using the Seedling Bulk: Test (SBT) method having free choice for the insects. Seeds were then sownin rows 2 cm apart, while plant to plant distance was one cm. Twenty plants in each entry were maintained in a row. All the seed boxes were then placed in a galvanized tin tray (225 x 90 x 10 em) filled with water. At seven days after transplanting, seedlings were infested with second or third instar nymphs of BPH at 6-8 nymphs/ seedling and infested seed boxescovered with a fine mesh nylon cage. Mean damage rating was done on 0-9 scale of Standard Evaluation System, when 95% of susceptible check, BR3 were dead (IRRI 1988).The materials showing doubtful reactions were retested using" no-choice" method. In this method each entry was caged separately by a small mylar film cage (20.5 x 5 x 2l.5 crn).Grade for plant damage using the following Standard Evaluation System for rice scale (IRRI, 1988).

Scale Damage

0 No damage

1 Very slight damage

3 First and 2nd leaves of most plants partially yellowing

5 Pronounced yellowing and stunting or about 10 to 25% of the plants wilting

7 More than half of the plants wilting or dead and remaining plants severely stunted or dying

9 All plants dead.

Source of Information: Bangladesh J. Life Sci. 13(1&2): 229-231. 2001 (June & December).

Article Link (Online Journal):

Funding Source:

1. Government

Budget:

Total Budget (Tk.) :

Achievement/Findings:

The resistent sources detected in rice entries under natural condition may be considered as an important achievement.These ten BPH resistant rice entries can be used as potential donors in the BPH resistant breeding programme.

Knowledge Management: Journal